How To Reset Rinnai Tankless Water Heater - ERNIEGRAVES

How to Reset A Rinnai Tankless Water Heater

Your hot water heater settings are most likely remain at the factory default temperature of 140 degrees if you haven’t changed them in a long while. The latter is especially true if your hot water heater was only recently installed; the old one was almost certainly altered at some time over the years, whereas the new one is set to the manufacturer’s recommended temperature.

Are Rinnai tankless water heaters a dependable choice?

Water heaters from Rinnai are intended for use in both commercial and domestic settings. It should be simple to reset the unit if you’re experiencing some difficulties. On the other hand, replacement components for Rinnai tankless water heaters are normally covered by a five-year limited guarantee. When used in residential settings, the heat exchanger comes with a 12-year limited guarantee. For those of you who are unfamiliar with Rinnai, the company has been making water heaters for quite some time, and you should not anticipate any issues in the near future.

Any single model comes with its own set of technical specifications, which you may find in the handbook.

A qualified expert with sufficient experience should be equipped with all of the equipment necessary for his or her job.

The simple act of pulling the tankless water heater apart may void the guarantee on your tankless water heater if it is still under warranty and you are attempting to fix the problem yourself.

How many error codes can Rinnai tankless water heaters have?

In addition, Rinnai machines may show an array of fault codes, with numbers ranging from 02 to 79 in length. Code FF, code LC, LC-LC 9, and No Error Code are also included in the list. If you take a closer look at your water heater, you will see Control-R TM, which allows you to restore the water heater to its original settings. Basically, all you have to do is push and hold the Connect button on your module until the LED starts blinking white. After then, you may let it go. The operation will return the module to its factory settings, which will be the default settings for your device.

What is the factory reset?

The FactoryResetcommand is going to reset the module’s settings to their factory defaults. The factory reset will erase all of your existing settings as well as the history of your wireless network connections. The Factory Reset function is required whenever you modify your wireless network configuration. Begin by performing a factory reset and then proceeding to select a new operating system. A Factory Reset should be performed as well when beginning a pairing procedure from the beginning of time.

Begin by pushing and holding the Connect button on the module for a few seconds until the LED on the module begins to glow WHITE. When you release the button, the module will reboot, and the moduleLED will turn red when everything is finished.

What about the Power Cycle?

Power Cycle will turn off the power to your unit and then turn it back on again. It performs the same effect as unplugging the water heater’s plug from the power socket and plugging it back in later. In order to avoid damaging your Rinnai tankless water heater, it’s best to use the power connector that came with the unit rather than the Reset option on the device when attempting to connect or unplug the power. You might consider inserting a tiny pin into the Reset aperture of the module in case you ever need to use the Reset option on the module.

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How To Reset Rinnai Tankless Water Heater? Complete Guide 2022

If you power cycle your device, it will turn off the power and then turn back on. It performs the same effect as removing the water heater plug from the power socket and then plugging it back in later. The power connector for your Rinnai tankless water heater is preferable to the Reset option on your device once you’ve tried connecting and detaching the electricity to your tankless water heater. It is preferable to insert a tiny pin into the Reset aperture of the module in case you ever need to utilize the Reset capability.

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How To Reset Rinnai Tankless Water Heater?

When your heater is not working properly, it may be quite annoying, especially if you have a large number of people living in your home. When all of the warm water fixtures are connected to the same unit, it becomes more difficult for individuals to organize their day. – An error code will appear on the digital display screen of your appliance if there is a problem with it. This code will indicate what the problem is with your appliance. The error code provides you with the information you need to identify the problem and obtain a quick solution.

Error Codes Of Rinnai Rankles Water Heater

This signal indicates that the burner is not operating properly while in freeze protection mode.

Solution

Since you can’t fix it on your own, it’s strongly advised that you get an expert to do it for you.

Error Code 3

It indicates that the power was stopped during the filling of the bath. When the electricity is restored, the water will not be able to run.

Solution

To begin, switch off all of the electrical outlets that are connected to the unit in your home. Now, go to the temperature controller and click the On/Off button twice, making sure that no water is escaping. It will allow the controller to fully bleed the Rinnai tankless water heater how to reset Rinnai tankless water heater. If, on the other hand, the code returns, you will need to replace the PC board.

Error Code 5

It indicates that there is a problem with the bypass valve in some way.

Solution

Turn off the heater’s power source, as well as any other fixtures that are linked to the heater’s circuit. Check to see that the water is not running
Electricity the machine up once again by turning on the power and turning on the hot water faucet. Once it has been started, the error code will be eliminated. If, on the other hand, the problem persists, the bypass valve must be replaced.

Error Code 7

This code indicates that there is a problem with the flow rate of the water circulation system. When the circulation flow rate is reduced to less than 2.1 gallons per minute, the issue manifests itself.

Solution

It indicates that either the air supply or the exhaust is obstructed. The appliance may suffer serious damage as a result of the air supply problem.

Error Code 10

It indicates that either the air supply or the exhaust has been obstructed in some way. Damage to the appliance as a result of a faulty air supply is possible.

Solution

First and foremost, inspect the vent systems for obstructions and obstruction clearance issues. Make careful to look for any other issues that could be interfering with adequate ventilation. Additionally, check the exterior venting system to see if there is any leakage or obstruction
If you are unable to locate or resolve the problem, do not hesitate to contact a professional.

Error Code 11

No ignition in the Rinnai tankless water heater indicates that the code 11 has been encountered.

Because this problem has anything to do with gas and gas lines, it is best to contact a plumber.

Solution

Make sure that the valve, water heater, gas meter, or cylinder are all in working order. Ensure that all of the fixtures are turned off but that the power is still turned on so that you can examine the deflection. Afterwards, examine the igniters to see whether or not they are performing properly. If everything appears to be working properly, but you are still not receiving hot water, contact a professional.

Error Code 12

Make sure that the valve, water heater, gas meter, or cylinder are all in good working order! Although all of the fixtures should be turned off, you should leave the power connected in order to measure deflection. Afterwards, examine the igniters to see whether or not they are functioning properly. If everything appears to be in working order, but you are still not obtaining hot water, call a professional for assistance.

Solution

Check to see if the flame is on by looking through the device’s window box. If you can see a flame in the burner box, it is clear that there is a problem with the flames themselves. If, on the other hand, there is no flame, this indicates an electrical failure. An electrical failure can be caused by a short circuit on the PC board, which can be the major cause. Remove the power from the machine, remove the circuit board, and then inspect the board for patches and cross-connections. If you are unable to fully analyze the situation, you can see an expert.

Error Code 13

The device’s window box may be used to check if the flame is lit. If there is a flame visible in the burner box, it is clear that there is a flame failure. If, on the other hand, there is no flame, there is an electrical problem. When an electrical failure occurs, it is possible that a short circuit within the PC board is to blame for it. Remove the machine from the power source, detach the circuit board, and inspect the board for patches and cross-connections. It is possible to contact an expert if you are unable to examine the situation effectively.

Solution

Make a visual inspection for B-vent materials and ensure that they are properly deployed. Assess the remaining venting systems to determine whether or not they have been properly installed. In addition, the dip switches should be verified in relation to the altitude. Check the gas supply and fire pressures at the intake
As soon as you are finished with the inspection, turn on the heating once more.

Error Code 14

It indicates that there is a problem with the thermal fuse in question.

Solution

It is necessary to inspect the bi-metal switches that are mounted to the top of the Rinnai tankless water heater in order to troubleshoot the unit. Allow the unit to cool for a few minutes before attempting to reset it. After that, look for Thermo fuses that may be present around the heat exchanger and check them. Ensure that the switches are in good working order if they are not. Thermal fuses will be replaced in order to resolve this problem. If you are confident in your ability to complete this task, you are good to go
Otherwise, contact a plumber for assistance.

Error Code 16

It is not a mistake, but rather a warning of overheating. It signifies that the machine has shut down automatically in order to protect itself from further damage.

Solution

Check the air filter to see if it is in good working order. If this is the case, clean out all of the clogs in the filter. After that, clear out all of the clogs and obstructions within the heater and locate their locations
Check to see if the venting system is clogged
If so, remove the obstruction.

Error Code 19

This number indicates that there is an electrical short in the wiring system. A breakdown in electrical grounding may result in the occurrence of this condition.

Solution

When it comes to resetting a Rinnai tankless water heater, we recommend that you consult with a trained professional. While you’re waiting for him to come, turn off the heater and cut off the warm water faucets.

Error Code 25

It demonstrates a variety of issues, the most prevalent of which is the condensation trap.

Solution

To begin, turn off the electricity and turn off the hot water faucets. After that, search for any obstructions in the drain pipe. You will need to open the cabinet in order to accomplish this. After that, thoroughly check the condensate tank to ensure that all obstructions have been removed. After that, check the drain line once again to determine the air gap. After that, examine the sensor wire harness to ensure that there are no loose connections between the sensors and the PC board. If the issue persists, it is possible that the sensor may need to be replaced.

Error Code 32

It’s possible that the issue is related to groundwater temperature. This code is also shown when the sensors are not functioning properly.

Solution

When this error number shows, the heater’s power is immediately turned off to prevent harm to the heater’s body. Now, open the machine and check the temperature of the groundwater within. Call a professional for sensor replacement if you’re not sure how to check the sensors.

Error Code 33

This indicates that the heat exchanger is not functioning correctly.

Solution

Power should be turned off in order to check the connections that are present inside the thermistor. Once the readings have been obtained from the resistance, they should be examined to ensure that the requirements are in order. It’s time to look for any scale buildup at this point. Remove the thermistor’s corrosion and clean it well
If the thermistor is still not operating properly, you can replace it.

Error Code 38

This code indicates that something is wrong with the CO sensor anomaly and that it needs to be investigated.

Solution

Materials and venting systems for 4-inch B-vents should be inspected to determine whether or not they have been correctly installed. Next, it is necessary to test the fire pressures, as well as to measure the low and high fire pressures
Finally, any dip switches that are present in the circuit should be checked for proper operation. Now, replace the PC board as well as the CO sensor.

Error Code 41

It is indicated by this code that the freeze protection sensors are not working properly.

Solution

You will receive this code if there is an issue with the freeze protection sensors.

Error Code 52

This code informs you that there is an issue with the freeze protection sensors.

Solution

First and foremost, the POV valve and resistance measurements should be examined and evaluated. If they have any issues, they should be rectified as soon as possible. If this is not the case, the input voltage to the valve should be tested. If the issue persists, it is necessary to replace the PC board or valve in question. Prior to changing them, you should get expert advice.

Error Code 61

When this code displays on the appliance’s display panel, it indicates that the combustion fan motor is experiencing some difficulty.

Solution

First and foremost, turn off the electricity and then turn off the hot water faucets. Check to see that there is no air pressure
Afterwards, inspect the PC board for frayed or damaged cables as well as loose connections. In the following step, you will check and remove the fan motor. Attempt to run the fan motor using a different source of electricity. Assuming the engine continues to run, it is possible that there is a problem with the housing
In this case, if there are no obstructions, you will need to replace the fan wheel and housing. If you are unsure of how to reset a Rinnai tankless water heater, you may rely on the professional assistance.

Error Code 65

The presence of this error number indicates that the water flow servo is experiencing difficulties. When this code is shown, it is recommended that you troubleshoot your Rinnai tankless water heater or perform a hard reset.

Solution

It is necessary to examine all of the wire connections on the circuit board. Take note of the water flow rate, as well as any other pertinent information. After that, switch off the electricity and wait a few seconds before turning it back on. The code should have vanished by now, but if it persists, contact a plumber for assistance.

Error Code 72

It indicates that there is a problem with the flame detection equipment. When the internal temperature is high and combustible, it will also manifest itself.

Solution

Test the wire harness coming from the flame rods to see if any connections are damaged or loose to begin with. When the heater ignites, check the flame rod for damage. As soon as you notice any flame, immediately turn off the unit and remove the flame rod
Then, once again, check for and remove any carbon deposits from the machine. Finally, examine the burner for rust and remove it if it is there.

Test the wire harness coming from the flame rods to see if any connections are damaged or loose. When the heater is turned on, check the flame rod. As soon as you notice any flame, immediately turn off the device and remove the flame rod. Then check for and remove any carbon deposits from the machine. Last but not least, examine the burner for rust and remove any found.

Error Code 79

The sound of a Rinnai tankless water heater beeping 79 indicates a serious problem that should be handled as soon as possible.

Solution

Turn off the electricity as soon as possible, and keep the hot water faucets closed. Now it’s time to put the heat exchanger and all of the interior pipework through its paces. If there are drips at the device’s base, this indicates that the heater has an interior problem
In this case, the machine should be pulled down and the inside cabinet should be examined to determine if it is completely wet or not. In the end, the specific internal pipe should be replaced, and the leak sensor should be dried up completely. Following this, the heater should be completely flushed out and the device should be turned back on again.

Error Code LC0 To LC9

Power should be turned off immediately, and any hot water fixtures should be shut off, too. Now it’s time to put the heat exchanger and all of the interior pipework through its paces! If there are drips at the device’s base, this indicates that the heater has an internal problem; in this case, the machine should be pulled down and the inside cabinet should be examined to determine whether it is completely wet or not; At the end, the specific internal pipe should be replaced, and the leak sensor should be dried up completely.

Following this, the heater should be completely flushed out and the unit should be turned back on;

Solution

First and foremost, turn on all of the hot water sources in order to flush out all of the water that has accumulated in the machine. Find out how to reset Rinnai tankless water heater leak so that the appliance may be reset and the error code eliminated. However, if the error is still present, you will need to call a professional who will examine the filter for the presence of limescale and perform the necessary repairs.

In conclusion, smart tankless water heating equipment are becoming increasingly popular in both commercial and residential premises. Although they are equipped with superior technology to deal with any problems that may arise, they are no different than any other appliance. Fortunately, they include error codes that may be simply deciphered in order to determine the various remedies. Things will get straightened out for you if you follow our instructions on how to reset the Rinnai tankless water heater.

How do I reset my Rinnai tankless water heater?

Asked in the following category: General 15th of February, 2020 was the most recent update. Turn off all hot water faucets and taps in the house. Press the On/Off button twice to turn the device on or off. Restart the hot water system and do a test. It’s possible that you’ll have to repeat this process a few times to completely reset the system. It is recommended that you use the water heaterpower plug rather than the Resetfeature on the module when connecting or disconnecting power to the tankless water heater.

In addition, why does my tankless water heater become chilly during the day?
There are several reasons for this, including: a clogged water filter on the cold water input.
This error number indicates that there is no ignition in your hotwater system or that there is no gas supply to your hotwater system.
Locate your gas source and check to see that it is operational.
A water heater may make an audible beep to alert you that there is a water leak.
An automatic water heater shutdown mechanism or a flood protection system may cause the beeping to occur.

Rinnai Tankless Error LC Code

Posted on January 18, 2011 | No Comments Your Rinnai will develop a scale buildup on the interior of the heat exchanger, which will reduce efficiency dramatically. If the pressure builds up too much, the Rinnai tankless will generate an error code LC (or 00 when previewing error history).

How to Fix Error LC on your Rinnai

As a temporary remedy, simply unplug the unit and wait 60 seconds before plugging it back in should make the tankless unit functional for a short period of time. It’s conceivable that the Rinnai will function well for up to a week before the error reappears, therefore it’s critical that you solve the problem as quickly as possible. In order to effectively resolve the issue, the tankless must be flushed in order to eliminate the scale accumulation. The water hardness in Toronto and the neighboring regions that are served by municipal water (which comes from Lake Ontario) is moderate.

Well water is notoriously hard, which means that if your property is served by it, you are more likely to see increased scale accumulation in your tankless water heater.

The LC code indicates that your tankless has accumulated too much scale and that it has to be flushed.

Alternatively, you may perform the flush yourself, but you will need a few supplies.

Discover how to properly cleanse your tankless water heater at home. Check out our tankless flushing service, which is available in Toronto and the surrounding areas.

Reset Rinnai LC Error Code After Flush

Scale accumulation in the heat exchanger (when examining the maintenance code history, the letter “00” is swapped for the letter “LC”).

Clean the heat exchanger according to the flushing process indicated in the water heater’s owner’s handbook. NOTE: The LC, LC0 – LC9 codes are the only ones that will allow a water heater to continue to run after being triggered. The LC codes will be shown alternately with the temperature setting on the display. The controller’s beeping will continue indefinitely. Resetting the LC code on older items may be accomplished by turning off the power and then turning it back on again. Water heaters that are newer than five years have a built-in shutdown function to avoid harm caused by the water heater scaling up. See the following sections for information on how to reset these water heaters:

Heat exchanger flushing should be performed in accordance with the manufacturer’s suggested flushing process specified in the water heater’s owner’s handbook Please keep in mind that only the codes LC0 through LC9 will allow a water heater to continue to function properly. The LC codes and the temperature setting will be displayed alternately on the display. Continued beeping will be heard from the controller. Resetting the LC code on older items may be accomplished by shutting off the power and then re-enabling it.

The following water heaters have a reset function:;

How do I reset my Rinnai hot water heater?

Flush the heat exchanger according to the suggested flushing process stated in the water heater’s owner’s handbook, if one is available. Please keep in mind that only the codes LC0 through LC9 will allow a water heater to continue to work. The LC codes and the temperature setting will be displayed alternately on the display. The controller’s beeping will continue indefinitely; Resetting the LC code on older items may be accomplished by turning off the power and then re-connecting it. A shutdown function is included into newer devices to protect against harm caused by the water heater scaling up.

Rinnai Tankless Error Code Troubleshooting

Please keep in mind that this content may contain affiliate links. This means that, at no additional cost to you, we may gain a small profit on purchases made via our links. Because Rinnai tankless water heaters are among the most technologically advanced on the market, we recommend that you contact a service expert that is certified to operate on Rinnai tankless water heaters for assistance. Each Rinnai unit is equipped with a temperature controller (either MC-91-1 or MC-91-2) on the front panel, which displays numerous configuration choices for installation as well as error codes in the event of a malfunction or failure.

Press and hold the ON/OFF button for two seconds while simultaneously pressing the UP arrow.

Need help troubleshooting a different brand of tankless water heater?

While some error codes may be resolved with a few basic tools and a little time, others are more difficult and need the services of a professional plumber.

Rinnai Tankless Water Heater Error Codes

What Error Code 02 Indicates:The water heater will not operate when in the freeze protection mode. Make a service call to get it fixed. What Error Code 03 Means: A power interruption occurred during the bath filling process (Water will not flow when power returns). Remove all hot water fixtures from the house in order to address the problem. To reset the unit and code, press the ON/OFF button twice in succession. If the code returns, it is probable that the P.C. board will need to be replaced.

It means that the servo has been bypassed (on all water heaters with bypass valves).
To get the unit going, turn on the hot water faucet.
Flow rate in the circulation system has decreased below 2.1 gpm, which is indicated by Error Code 7.
Check to see that the water is turned on and that you have at least 30 psi flowing in.
Drain the tank and inspect the intake water filter to ensure it is not blocked.
What Error Code 10 Indicates: A clog in the air supply or exhaust system.
Take care to ensure that the venting system is not obstructed in any way.

The problem is almost certainly due to incorrect vent pipe installation, which accounts for 95% of the cases.

It means that there is no ignition (heater not turning on).

Flame failure is indicated by the error code 12.

Remove scale buildup from the flame rod, as well as debris and dirt from the burners.

How to Correct: Confirm 4 “The B-Vent venting materials were placed in the right manner.

Check that the dip switches are appropriately adjusted for the altitude.

Check that the low and high fire pressures on the device are appropriately adjusted.

To Correct: Check to see that there are no air flow obstacles in the vent system or surrounding the unit.

Check to see that the heat exchanger is in perfect functioning order.

It means that the system is overheating (safety shutdown because unit is too hot).

Check to make sure there are no blockages in the combustion chamber or exhaust piping before starting the engine.

Heat exchanger fins should be cleaned or the heat exchanger should be replaced.

How to Resolve: Check/test all water heater components for signs of electrical shorting.

What it Means: The condensate trap has reached capacity.

Check to verify that the condensate line has an air gap between the unit and the drain line exiting the unit before continuing.

If the tank is successfully draining but the error code 25 continues to occur, the condensate tank and sensor should be replaced.

What it Means: There have been reports of flammable fumes.

Check for loose, damaged, or broken connections in the flammable vapor sensor, and make sure the wire harness is in good working order as well.

If the code persists, the flammable vapor sensor should be replaced.

What it Means:An anomaly in the burner sensor (thermocouple).

If everything appears to be in working order, replace the thermocouple.

What it Means: An irregularity in the incoming water temperature sensor (thermistor).

Check the resistance readings to ensure that they are within specifications.

The thermistor should be replaced.

What it Means:An irregularity in the heat exchanger’s outgoing sensor (thermistor).

Check the resistance readings to ensure that they are within specifications.

The thermistor should be replaced.

What it Means: The sensor for the combustion air temperature has failed.

Check the resistance readings to ensure that they are within specifications.

The thermistor should be replaced.

How to Resolve: Check that the tank temperature sensor does not have any loose, damaged, or broken connections.

Check for scale accumulation on the sensor.

What Error Code 38 Indicates:An issue with the CO sensor (RH-180 only).

Verify that the remainder of the vent system has been installed appropriately (clearance, materials, joints sealed, properly seated sections).

Confirm the minimum and maximum incoming gas supply.

Replace the CO sensor as well as the PC board.

How to Repair: Check that the freeze protection sensor/thermistor does not have any loose, damaged, or broken connections.

Check the resistance readings to ensure that they are within specifications.

What it Means: An irregularity in the water temperature sensor at the inlet.

Examine the sensor for scale accumulation and clean it if necessary.

Error Code 52 is a numerical code that indicates a problem.

How to Repair: Check the POV valve to be sure there are no loose, damaged, or broken connections.

While the device is attempting to ignite, monitor the voltage to the POV valve.

This error code indicates that the burner has overheated and the bi-metal switch has failed.

Check the resistance readings to ensure that they are within specifications.

If you acquire the right voltage but the problem message persists, the PC board should be replaced.

How to Resolve: The code arises when one of the two bi-metals at the back of the secondary heat exchanger opens and allows heat to pass through.

Scale buildup on the heat exchanger should be checked for and flushed if necessary.

What Error Code 61 Indicates:Fault with the combustion fan motor.

Remove the fan motor and examine the blower wheel to ensure that it is free to revolve.

Resistance of the fan motor’s windings is measured.

If the windings are within specifications, the PC board should be replaced.

What it Means: The circulation flow rate has decreased to less than 1.3 gpm.

It is necessary to bleed air from the tank and pump and clean the intake water filter if the flow rate is less than 1.3 gpm.

What Error Code 65 Indicates: An anomaly in the water flow control system.

Turn off the power to the machine and then turn it back on to see whether the code is no longer displayed.

What Error Code 70 Indicates: A problem with the PC board.

Check that the dip switches are properly configured.

What Error Code 71 Indicates: A failure in the solenoid valve circuit.

Inspection of plastic tubing on internal units for moisture; if moisture is discovered, the gas valve should be replaced.

Resistance is measured.

PC board should be replaced.

How to Correct: Check that there are no loose, damaged, or broken connections on the flame rods.

Removal of the flame rod is required to check for carbon buildup and, if necessary, cleaning of the flame rod and replacement of the flame rod gasket.

Replace the flame rod, the flame rod gasket, and the PC board as needed.

How to Repair: Check that the burner thermocouple does not have any loose, damaged, or broken connections.

Replace the thermocouple on the burner.

What Error Code 79 Indicates: A water leak has been detected.

Check for leaks in the heat exchanger and throughout the piping system.

If the error code recurs, disconnect the sensor and turn on the water heater again.

The meaning of the error code FE is: Flammable vapors have been detected.

Check for loose, damaged, or broken connections in the flammable vapor sensor, and make sure the wire harness is in good working order as well.

If the error persists, the flammable vapor sensor and/or the PC board should be replaced.

What it Means:A maintenance procedure has been completed.

How to Resolve: This informs the system that any error codes that show occurred after the fixes were completed.

LC0 is the error code (through LC9) What it Means: Lime scale accumulation on the skin.

If you want to temporarily reset the code, push the ON/OFF button five times in succession. An LC code will be issued, which will allow the unit to operate for 70 hours before another LC code will be issued, which will prevent the unit from operating.

How do I reset my Rinnai water heater?

Water heater will not operate while in freeze protection mode, according to Error Code 02: Service call should be scheduled. Bath filling is interrupted by a power failure, resulting in Error Code 3. (Water will not flow when power returns). Remove all hot water fixtures from the house and follow these steps to fix the problem: To reset the unit and code, press the ON/OFF button twice. The P.C. board will almost certainly have to be replaced if the code reappears. Bypass servo fault is indicated by error code 05.

In order to correct the problem, turn off and then on again the unit’s power supply (if applicable).
This means that the bypass valve will need to be replaced if the error code “05” reappearance.
Check to see that the water is turned on and that you have at least 30 psi coming in from the outside.
Discard water from the tank and check to see if the inlet water filter is blocked.
Check that the Rinnai venting materials that are recommended are being used.
Check that the length and diameter of the vents are within the proper limits and margins.
No ignition is indicated by error code 11.

To Correct: Assuming the gas type and pressure are correct, and there is no air in the gas line or other problem with the gas supply, check that the following items are in working order: the igniter generates spark, the wiring connections are secure, the unit is properly grounded, the dip switches are set correctly, the gas solenoid valves are not open or short circuited, the burners are properly seated, and no debris or dirt is clogging the burners.

Flame failure is the cause of Error Code 12: Assuming the gas type and pressure are correct, there is no air in the gas line or any other problem with the gas supply, check to see that there are no loose connections at the PC board, power supply, or flame rod; that there is no short circuit in the gas solenoid valve; there is no obstruction in the venting system; and that gases are venting correctly.

Remove scale buildup from the flame rod and debris and dirt from the burners.
Verify that the remainder of the vent system has been installed properly.
Verify that the dip switches are properly configured for the altitude at which you are operating.
Thermal fuse failure or overheating is indicated by the error code 14.
Inspect the water flow system to ensure that there are no obstructions, as there must be sufficient incoming cold water to pass through the heat exchanger.
Over temperature warning is indicated by error code 16.
Solution: Check for low flow in the water circulation system, which could be causing the system to cycle faster than expected.

Confirm that the heat exchanger fins are not obstructed in any manner.

Faulty electrical grounding is the cause of Error Code 19.

How to Resolve: Error Code 25 is a numerical code that indicates a problem with the computer’s hardware.

To Repair: Check the condensate drain line and trap, as well as the tank within the cabinet, for obstructions.

Examine the connections between the sensor and the PC board for any loose, broken, or damaged connections.

Code 30 indicates an error.

The Fix:IMPORTANT: It is necessary to fix this error.

Check for loose, damaged, or broken connections in the flammable vapor sensor, and make sure the wiring harness is not damaged either.

The flammable vapor sensor should be replaced in the event that the code reappears again.

Burner sensor abnormality is what this means (thermocouple).

Replace the thermocouple if everything appears to be in working order.

What it Means: An abnormality with the incoming water temperature sensor (thermistor).

Ensure that the resistance readings are within specification.

Thermistor should be replaced.

Meaning of the Message:An abnormality in the heat exchanger outgoing sensor (thermistor).

Ensure that the resistance readings are within specification.

Thermistor should be replaced.

Exactly what it means is that there was a problem with the combustion air temperature sensor.

Ensure that the resistance readings are within specification.

Thermistor should be replaced.

What Does Error Code 35 Mean?

Ensure that the resistance readings are within specification.

Sensor must be replaced.

(RH-180 only).

Verify that the remainder of the vent system has been installed properly.

Verify that the dip switches are appropriately configured for the altitude at which you are operating.

CO sensor and PC board to be replaced.

(external units).

Inspect sensor to ensure it is not covered with insulation or closed off from the outside world.

The error code 51 indicates a problem with the computer.

How to Resolve: Check the sensor wiring harness for any loose, damaged, or broken connections.

Ensure that the resistance readings are within specification.

This indicates a problem in the signal modulating solenoid valves (POV).

Ensure that the resistance readings are within specification.

Replacement of the PC board is necessary if you obtain sufficient voltage but the problem code still persists.

Repair Procedure: Check the POV valve for any loose, damaged, or broken connections.

While the device is attempting to ignite, check the voltage to the POV valve.

Second heat exchanger sensor failure is indicated by the error code 58.

Examine the sensor wire harness to ensure that there are no loose, damaged, or broken connections.

Treat hard water to keep scale buildup at bay in the future, if possible.

How to Resolve: Check the fan motor wire harness for any loose, damaged, or broken connections.

Check for obstacles in the fan housing.

Motor should be replaced if the windings become loose.

error code 63 is a numerical code that indicates an error.

Using the temperature controller, you can show the flow rate (hold the UP button for 3 seconds and then push the ON/OFF button).

Bleed air from the tank and pump.

It means that there is an anomaly with the water flow control.

The device should be turned off and then on again to determine whether the code is no longer displayed.

Faulty PC board is the cause of Error Code 70.

Check to ensure that the dip switches are properly configured.

Faulty solenoid valve circuit is indicated by the error code 71.

Inspection of plastic tubing on internal units for moisture; if moisture is discovered, the gas valve should be replaced immediately.

The resistance should be measured.

PC board should be changed out.

Identify any loose, damaged, or broken connections on the flame rods and repair them as necessary.

Removal of the flame rod is essential to check for carbon buildup and, if necessary, cleaning of the flame rod and replacement of the flame rod gasket Make a visual inspection of the interior of the burner for any debris that may be causing the short circuit.

What Error Code 73 Indicates: A thermocouple problem in the burner circuit.

Check to ensure that the dip switch settings are right before moving forward.

PC board should be changed out.

How to Repair: Check the leak detector to make sure there are no loose, damaged, or broken connections.

If there are no leaks identified, wipe off any water that may have accumulated within the cabinet, dry off the leak sensor, and turn the device on once more.

The sensor and screw must be replaced if the unit continues to function without the sensor.

The Fix:IMPORTANT: It is necessary to fix this error.

Check for loose, damaged, or broken connections in the flammable vapor sensor, and make sure the wire harness is not damaged either.

If the error persists, the flammable vapor sensor and/or the PC board should be replaced immediately.

What it Means:A maintenance procedure has been carried out successfully.

How to Resolve: If any error codes occur after repairs have been completed, the system will be informed.

Error Code LC0 is a numerical code that indicates that an error has occurred (through LC9) Meaning of the Symptoms: Lime scale buildup In order to correct the problem, flush the heat exchanger according to the instructions provided by the manufacturer in the operator’s handbook.

Press the ON/OFF button five times to temporarily reset the code. An LC code will be sent to allow the device to work for 70 hours, after which it will be locked out of operation by another LC code.

What Error Code 02 Means: The water heater will not operate while in freeze protection mode. How to Resolve: Call a service technician. What Error Code 03 Indicates: A power interruption occurred during the bath filling process (Water will not flow when power returns). Remove all hot water fixtures from the house and follow these steps to fix the problem. To reset the unit and its code, press the ON/OFF button twice. If the code recurs, it is likely that the P.C. board will need to be replaced. What Does Error Code 05 Mean? It means that the servo fault has been bypassed (on all water heaters with bypass valves). How to Resolve: Shut down the unit’s power supply and then turn it back on. To activate the unit, turn on the hot water faucet. If the error code “05” recurs, the bypass valve will need to be replaced. The meaning of Error Code 07 is: The circulation flow rate has dropped below 2.1 gpm. How to Correct: Confirm that the unit has power. Verify that the water supply is operational and that you have at least 30 psi coming in. Check the pump wiring harness for any loose, damaged, or broken connections. Drain the tank and check to see if the inlet water filter is clogged. Remove the heat exchanger and flush it. What Error Code 10 Indicates:An obstruction in the air supply or exhaust system. How to Correct: Verify that the recommended Rinnai venting materials are being utilized. Check to see if there are any obstructions in the ventilation system. Check that the length and diameter of the vents are within the proper limits and clearances. There is a 95% chance that the problem is due to improper vent pipe installation. What Error Code 11 Means: There is no ignition (heater not turning on). How to Fix: Assuming that the gas type and pressure are correct and that there is no air in the gas line or other problem with the gas supply, check that the igniter generates spark, that the wiring connections are good, that the unit is properly grounded, that the dip switches are set correctly, that the gas solenoid valves are not open or short circuited, that the burners are seated correctly, and that there is no debris or dirt clogging the burners. What Error Code 12 Means:Flame failure. How to Correct: Assuming that the gas type and pressure are correct, and that there is no air in the gas line or other problem with the gas supply, check that there are no loose connections at the PC board, power supply, or flame rod, that the gas solenoid valve does not have a short circuit, that there is no obstruction in the venting system, and that gases are correctly venting out. Remove scale buildup from the flame rod and debris from the burners. The meaning of Error Code 13 is: Abnormal combustion. How to Correct:Confirm 4 “The B-Vent venting materials were installed correctly. Verify that the rest of the vent system is properly installed (clearance, materials, joints sealed, properly seated sections). Check that the dip switches are properly set for the altitude. Confirm minimum and maximum inlet gas supply. Confirm that the low and high fire pressures on the unit are properly set. Thermal fuse failure or overheating are the causes of Error Code 14. How to Resolve: Check to see that there are no air flow obstructions in the vent system or surrounding the unit. Check that there are no obstructions in the water flow system, as there must be enough incoming cold water to pass through the heat exchanger to function properly. Check to see that the heat exchanger is in proper working order. What Does Error Code 16 Mean? It means that there is an over temperature warning (safety shutdown because unit is too hot). Solution: Check for low flow in the water circulation system, which could be causing the system to cycle faster than usual. Check to see that there are no obstructions in the combustion chamber or exhaust piping before starting the engine. Confirm that there are no obstructions in the heat exchanger fins. Heat exchanger fins should be cleaned or replaced. What Error Code 19 Indicates: An electrical grounding fault has occurred. Identify and test all water heater components for electrical shorts. How to Fix: Error Code 25 is a numerical code that indicates a problem. What it Means: The condensate trap is completely full. How to Resolve: Inspect the condensate drain line and trap for obstructions, as well as the tank inside the cabinet, before proceeding. Confirm that the condensate line has an air gap between the unit and the drain line exiting the unit before continuing. Check the connections between the sensor and the PC board for loose, broken, or damaged connections. If the tank is correctly draining but the error code 25 continues to appear, the condensate tank and sensor should be replaced. ‘Error Code 30’ is a numerical error code. What it Means:Vaporizable vapors have been detected. How to Resolve: IMPORTANT: Leave the area where the water heater is installed until safety personnel have determined that the area is safe and that all flammable vapors have been eliminated. To ensure that the flammable vapor sensor is not damaged, inspect the wiring harness for loose, damaged, or broken connections. Once you are certain there are no flammable vapors present, turn the power and gas back on and open a hot water tap to re-ignite the unit. If the code appears again, the flammable vapor sensor should be replaced. Error Code 31 is displayed. What it Means:An abnormality in the burner sensor (thermocouple). How to Correct: Verify that the dip switches and low/high fire manifold pressures are correctly set, and that the thermocouple millivolt range is within specifications. If everything appears to be in order, replace the thermocouple. Error code 32 is a numerical code that indicates a problem. What It Means: An abnormality in the incoming water temperature sensor (thermistor). How to Repair: Check the thermistor’s connections to ensure there are no loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. Check the thermistor for scale buildup. The thermistor should be changed. Error Code 33 is displayed. What It Means:An abnormality in the heat exchanger’s outgoing sensor (thermistor). How to Repair: Check the thermistor’s connections to ensure there are no loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. Check the thermistor for scale buildup. The thermistor should be changed. Error Code 34 is displayed. What it Means:Failure of the combustion air temperature sensor. How to Repair: Check the thermistor’s connections to ensure there are no loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. Check the thermistor for scale buildup. The thermistor should be changed. What Error Code 35 Indicates: An error with the tank temperature sensor. How to Resolve: Check the tank temperature sensor connections to ensure there are no loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. Check the sensor for scale buildup. Sensor needs to be replaced. CO sensor abnormality is the cause of Error Code 38. (RH-180 only). How to Correct:Confirm 4 “The B-Vent venting materials were placed correctly. Verify that the rest of the vent system is correctly installed (clearance, materials, joints sealed, properly seated sections). Check that the dip switches are appropriately adjusted for the altitude. Confirm minimum and maximum inlet gas supply. Confirm that the low and high fire pressures on the device are appropriately adjusted. Replace both the CO sensor and the PC board. What Error Code 41 Indicates: An abnormality in the freeze protection sensor (external units). Identify and repair any damaged or loose connections on the freeze protection sensor/thermistor. Verify that the sensor is exposed to the outside air and is not covered with insulation. Resistance readings should be checked to ensure they are within specifications. Error Code 51 is displayed. What it Means: There is an abnormality with the inlet water temperature sensor. How to Resolve: Check the sensor wiring harness to make sure there are no loose, damaged, or broken connections. Check for scale accumulation on the sensor and clean it if necessary. Resistance readings should be checked to ensure they are within specifications. Error code 52 is displayed. What it Means:An abnormality in the modulating solenoid valve signal (POV). How to Repair: Check that the POV valve does not have any loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. While the unit is attempting to fire, check the voltage to the POV valve. If you get the proper voltage but the error code persists, you should replace the PC board. It means that the burner has overheated and the bi-metal switch has failed. How to Repair: Check that the POV valve does not have any loose, damaged, or broken connections. Resistance readings should be checked to ensure they are within specifications. While the unit is attempting to fire, check the voltage to the POV valve. If you get the proper voltage but the error code persists, you should replace the PC board. What Error Code 58 Indicates: Faulty secondary heat exchanger sensor. How to Resolve: The code appears when one of the two bi-metals at the rear of the secondary heat exchanger opens and allows heat to escape. Examine the sensor wire harness to make sure there are no loose, damaged, or broken connections. Check the heat exchanger for scale buildup and flush it if required. Treat hard water to keep scale from forming in the future. What Error Code 61 Indicates: Faulty combustion fan motor. How to Correct: Verify that there are no loose, damaged, or broken connections in the fan motor wire harness. Remove the fan motor and examine the blower wheel to ensure that it can freely revolve. Check the fan housing for any blockages before continuing. The resistance of the fan motor’s windings is measured. If the windings become open, the motor must be replaced. If the windings are within specification, the PC board should be replaced. Error Code 63 is shown. What it Means: The circulation flow rate has dipped below the 1.3 gpm threshold. Instructions for Repair:Use the temperature controller to show the flow rate (hold the UP button for 3 seconds and then push the ON/OFF button). It is necessary to bleed air from the tank and pump and clean the intake water filter if the flow rate is less than 1.3 gpm. It is also necessary to ensure that the inlet flow rate is at least 6 gallons and that the inlet water pressure is between 30 and 50 PSI. What Error Code 65 Indicates: A problem with the water flow control system. How to Resolve: Check the water flow servo connections to ensure there are no loose, damaged, or broken connections. Turn off the power to the unit and then turn it back on to determine whether the code is no longer there. If the code returns, contact customer assistance. What Error Code 70 Indicates: A defect on the PC board. Identify any loose, damaged, or broken connections on the PC board and make the necessary repairs. Verify that the dip switches are properly configured. PC board must be replaced. What Error Code 71 Indicates: Fault in the solenoid valve circuit. How to Resolve: Verify that there are no loose, damaged, or broken connections on the wire harnesses for the SV0, SV1, SV2, SV3, and SV4 gas valve solenoids before proceeding. Inspection of plastic tubing on internal components for moisture
If moisture is discovered, replace the gas valve. Check the voltages of SV0 and SV1 to ensure they are within specifications. Resistance should be measured. The gas control valve should be replaced. PC board must be replaced. What Error Code 72 Indicates:Fault with the flame detection equipment. How to Repair: Check that there are no loose, damaged, or broken connections on the flame rods. When shooting, make sure the flame rod is in contact with the flame. Removal of the flame rod is essential to check for carbon buildup and, if necessary, cleaning of the flame rod and replacement of the flame rod gasket. Examine the interior of the burner for any debris that might be producing a short circuit. Replace the flame rod, the flame rod gasket, and the PC board as necessary. What Error Code 73 Indicates: A thermocouple malfunction in the burner. How to Repair: Check the burner thermocouple to make sure there are no loose, damaged, or broken connections. Verify that the dip switch settings are accurate. Thermocouple for the burner should be replaced. PC board must be replaced. What Error Code 79 Means: A water leak has been discovered. How to Resolve: Check that there are no loose, damaged, or broken connections on the leak detector before proceeding. Check for leaks in the heat exchanger and all of the pipework. If there are no leaks identified, wipe off any water that may have accumulated within the cabinet, dry off the leak sensor, and restart the device. The sensor should be unplugged and the water heater should be turned on if the error signal displays again. If the item continues to function despite the sensor being removed, the sensor and screw should be replaced. Error Code FE: Flammable fumes have been identified. How to Resolve: IMPORTANT: Leave the area where the water heater is installed until safety personnel have determined that the area is safe and that all combustible vapors have been eradicated. To ensure that the flammable vapor sensor is not damaged, inspect the wire harness for loose, damaged, or broken connections. Once you are certain there are no combustible fumes present, switch the electricity and gas back on and open a hot water tap to re-ignite the device. If the problem arises again, the flammable vapor sensor and/or the PC board should be replaced. FF is the Error Code. What it Means:A maintenance procedure has been carried out. How to Resolve:This code indicates that a service professional has recently done maintenance or repair on the equipment. This notifies the system that any error codes that show occurred after the fixes were completed. To input the FF code, hit the keys UP, DOWN, and ON/OFF at the same time. LC0 is an error code (through LC9) In layman’s terms, it means lime scale build-up. The solution is to flush the heat exchanger according to the manufacturer’s suggested flushing process, which may be found in the owners handbook. Press the ON/OFF button 5 times to temporarily reset the code. This will let the device to run for 70 hours, after which it will be locked out of operation by another LC code.

Rinnai Water Heater Troubleshooting & How-to Guide

Rinnai has earned a reputation for manufacturing tankless water heaters that are both highly efficient and minimal maintenance, with a life expectancy of up to 20 years. When in use, their highly rated water heaters, on the other hand, may experience problems. Inadequate installation and inadequate maintenance, as well as incorrect use or component wear and tear, can all result in these problems. Some repairs may be completed by the homeowner, while others will necessitate the services of a professional plumber.

How to operate a Rinnai water heater

Make a clockwise turn of the gas valve to the “On” position
By pushing the power button, you may turn on the water heater’s electricity supply. Set the appropriate water temperature on the thermostat by pressing the up and down arrows next to the ‘Hot water temp’ button. Continually adjust until you see the temperature you want shown on the digital monitor
For example, if you want to change the temperature scale from Fahrenheit to Celsius or vice versa, press and hold the “On/Off” button for five seconds while the water heater is turned off. The moment you turn on a hot water faucet, the burner is instantly ignited, supplying hot water.

Also, have a look at this: An Instructional Guide for Troubleshooting the White Rodgers Thermostat

How do I reset my Rinnai water heater?

Setting the Rinnai water heater to the factory default presets will completely remove all of the unit’s current settings and reinstall them.

Turn off all of the hot water taps in the house. Press the On/Off button twice to turn the device on or off. Restore hot water to the faucet. Upon turning off the water, the temperature returns to the factory setting, which varies according on the model number
It is possible that you may need to repeat this step a number of times to completely reset the system.

Rinnai water heater error codes, meanings, and fixes

Rinnai water heaters are equipped with a self-diagnosis technology that continuously checks the device. When something goes wrong with the heater, an error code is shown on the screen. Keep in mind that error codes differ from brand to brand and model to model. We’ve put up an error code reference to assist you in diagnosing problems and providing solutions.

Error code	Meaning	Remedy
2	The water heater fails during freeze mode protection.	Call a professional plumber
3	Power interruption during a bath fill; water does not heat after power returns.	Perform a factory reset for the water heater.
5	Bypass servo fault on water heaters with bypass valves.	Switch off the power supply to the water heater.Turn it back on.Turn on any hot water faucet to fire up the unit.If error code 5 persists, replace the bypass valve.
7	Circulation flow is below 2.1 GPM	Check the water heater is receiving power. Check the water supply and ensure the water flow is at least 30 psi. Check the pump wiring, look for any loose, damaged, or broken connections, and replace if necessary. Drain the water tank and check the water inlet filter for any blockages. If it is clogged, clean it or replace it. Flush and descale the heat exchanger.
10	Exhaust or air supply blockage	Ensure the venting material is compatible and approved by Rinnai.If not, replace the parts withRinnai-approved venting materials.Check for blockages in the venting system. Check for any loose connections in the venting system. Ensure the vent length and diameter is within the correct clearance and limits. The most likely reason is a poorly installed vent pipe.
11	The heater does not turn on.	Ensure you have the right gas type and the pressure is correct. Make sure there is no air in the gaslight preventing gas from flowing.Switch off the water heater and drain the gas line. Check the ignitor is not blocked and generates a spark. Check the wiring connections; the unit is correctly grounded, dip switches seat correctly, the gas solenoid has no short circuit. Check the burners, ensure they are seated correctly and they are free from debris and dirt.
12	Flame failure	Check the power supply and connection. Ensure the gas type, quality and pressure are correct. Check for loose connections on the PC board and flame rod wire. Look for a short circuit on the gas solenoid. Verify there are no blockages in the venting system. Remove debris and blockages from the flame rod.
13	Abnormal combustion	Confirm proper installation of the vent system. Set the dip switch properly according to altitude. Check the gas supply inlet. Verify the gas pressure is correct.
14	Overheated or faulty thermal fuse	Look for airflow obstructions in the vent system and water flow system. Check the heat exchanger for hard water scaling and flush out the heat exchanger. Verify the high fire and low fire manifold pressure is correct.
16	Safety shut down due to unit overheating.	Look for short cycling caused low flow in the water circulation system. Verify there are no blockages in the combustion chamber, exhaust pipe, heat exchanger fins. Flush out the heat exchanger, clean the heat exchanger fins or replace the entire heat exchanger.
19	A faulty electrical grounding.	Test all the unit components for a short circuit with a multimeter. Replace any short parts.
25	The condensate pipe is blocked.	Inspect the condensate drain line and tank for blockages. Ensure the condensate line has an air gap between the unit and the outlet drain line. Check for loose or damaged connections between the sensor to the PC board. Replace the condensate tank and sensor.
30	Presence of flammable vapors	Switch off gas and power to the unit. Check the flammable vapor sensor and wiring harness and look for damages. If the error code persists after switching on the unit and the hot water tap, replace the flammable vapor sensor.
31	Abnormal burner sensor	Ensure the dip switches and high and low fire manifold pressure are correctly set. Verify the thermocouple milli-volt range are according to the specs. Replace thermocouple.
32	Faulty outgoing water temperature sensor	Examine the sensor and check for damage and blockage. Replace the sensor if the problem persists.
33	Faulty heat exchanger outgoing sensor	Look for damaged or loose connections in the sensor. Ensure the resistance readings are within specs. Check for build-up in the sensor and clean it if necessary. If the issue persists, replace the sensor.
72	A faulty flame sensing device	Ensure the flame rod is touching the flame when the unit fires. Check the wiring to the flame rod for damage. Clean the flame rod with sandpaper.Examine inside the burner chamber for debris or gunk that might be blocking the flame at the flame rod. Replace flame rod.
LC or 00	Limescale build-up	Flush the heat exchanger.Reset the code temporarily by pressing the ‘On/Off’ button five times. The unit will run for 70 hours straight before shutting down again from the LC error code.

Why is my Rinnai water heater not working?

Here are some of the reasons why your water heater isn’t working, as well as some troubleshooting suggestions:

1.High limit switch has tripped

Check to see if the unit is receiving electricity
Reset the unit’s settings. If the water heater ignites, the problem is with the switch, which has to be replaced.

2.Gas supply

Check for any problems with the gas supply that might prohibit the unit from welcoming guests. Inspect for blockages, evaluate the quality of the gas, and verify that the pressure is right. If the gas has only recently been placed, bleed the gas line to check that there is no air in the system. Examine and confirm that the gas connection between the gas control and the heater is secure. Ensure that there is no moisture in the gas line and that the gas valve is replaced if necessary.

3.Moisture

Check for moisture in the heat exchanger and on the burner, which can cause corrosion and make the unit difficult to ignite. Make certain that the wiring and connections are dry, and replace any that have been damaged by dampness. Rod of fire
Check to see that the flame rods are properly installed and that each one is in contact with the fire when the unit ignites. Any deteriorated flame rod should be replaced.

4.Vent system

If there is a clog in the vent system, check it. Remove any dirt or sediments that may be preventing air from entering the system. Check for loose connections and bent vents
If necessary, replace them. Examine the type of vent material, its length, and the clearances around it.

Why am I not getting hot water from my Rinnai tankless water heater?

There are a variety of factors that might prohibit your tankless water heater from producing hot water. When your water heater does not produce hot water, the most likely explanation is that the ignition system has failed. Some of the issues may be resolved by the user, whilst others may necessitate the assistance of a professional specialist. Listed below is a procedure for troubleshooting the problem:

Check to see that the water heater is connected to electricity. Check to see that the power outlet is operational and that there is no short circuit or blown electrical fuse in the system. Check the gas supply to make sure it is working properly. Check to see that there is adequate gas flow and that the intake connection is secure. If the unit was just installed, make certain that the gas line has been fully bled to eliminate all of the air that has accumulated in the passage. If the gas supply is satisfactory, check that the gas valve leading to the water heater is turned on. Ensure that the water supply is adequate and that the unit is receiving sufficient water at the proper pressure. If you are using too many hot water faucets at the same time, the unit will stop supplying hot water to another faucet until you stop using them all. Only one appliance should be running at a time. Check to see that the vent system on the roof is not obstructed. In order for the unit to heat the water correctly, it requires appropriate circulation of oxygen and carbon monoxide. Ensure that the flame rods are not obstructed by anything. Check to see that they are properly placed. Debris should be removed, and any broken flame rods should be replaced. Clean the burners, removing any condensate build-up, dust, and debris from the combustion chamber. If there are any rusted burners, they should be replaced. It is important to check that the dip switch and manifold pressure are set appropriately for high altitude if you are in a mountainous location. Check for frozen components and pipelines when the temperature is cold or throughout the winter. Insulate all of the wires and pipes that are exposed with an insulating jacket.

Rinnai tankless water heater control panel not working

Listed below are the steps to take when troubleshooting a tankless water heater with a bad control panel:

If your tankless water heater’s control panel is malfunctioning, follow these steps to troubleshoot it. –

Rinnai tankless water heater beeping

Your water heater is emitting a beeping sound as a warning that something is amiss with the equipment. Typically, the heater will emit a beep before shutting off to avoid further harm to your equipment from occurring. It then shows error codes on the control panel as a result of the malfunction. The following are some typical causes for your Rinnai water heater to beep, as well as some troubleshooting tips:

1.Water leakages

Check for leaks in the water heater to ensure it is functioning properly. It’s possible that the leak is coming from the heat exchanger or water pipes, which a plumber can swiftly repair. If there is no sign of leaking, the leak sensor may be faulty. Look for loose or broken wire and replace it or the sensor if necessary
If the sensor is not damaged, it is possible that it is moist. Turn off the water heater and dry the leak sensor and the heater casing on the inside with a dry cotton cloth.

2.Limescale build-up

Make a visual inspection of the water heater for limescale buildup caused by hard water that has passed through it. Check for blockage in the inlet filter after flushing the heat exchanger. Maintenance should be performed on the filter to remove dirt and enhance flow rate while also preventing the device from overheating.

3.Minimum flow rate

Check the flow rate of your device to make sure it is working properly. Tankless heaters require a minimum flow rate and pressure in order to function properly. The flow rate of your water heater should be greater than 5 GPM, and the minimum pressure should be 30 PSI. When you run the water heater at a low flow rate, you are overworking the machine and increasing the risk of overheating.

4.Overloaded system

Water heaters, like other appliances, have a maximum flow rate restriction as well as a minimum flow rate limit. Overloading your unit means that you are using more beyond the maximum capacity that your household can utilize at one time. Close some open faucets to minimize pressure and demand, which will help to keep the heater from shutting off altogether. If the device shuts down due to overheating, reduce the temperature on the thermostat to the lowest level or cut off the heater’s electricity for about 30 minutes.

5.Low gas level

When the fuel level in a gas-powered tankless heater is becoming low, the heater will beep. Make sure you have enough petrol in your tank.

A beep will sound if the fuel level in a gas-powered tankless heater is low. Make sure you refuel your car.

What is the priority button on Rinnai?

On the temperature controller, there is a priority button to press. In the center of the unit is a green LED, which indicates that the thermostat is adjusting the water temperature and that the device is ready to provide hot water. When you turn on the hot water tap, the water comes out at a predetermined temperature, as seen below. The priority button also has the additional function of locking and unlocking the controller. Hold down the priority button and the up button at the same time for five seconds to complete the task.

To unlock the controller, go through the process again.

How to flush the Rinnai water heater

Over time, limescale deposits will build up inside the heating chamber and pipes of your water heater, causing it to malfunction. This build-up will prohibit your equipment from operating at peak performance. A cleaning or descaling of your water heater is recommended once a year, and more frequently if you have hard water with significant mineral components. The following is the procedure for flushing your water heater:

Things you’ll need

Screwdriver, non-contact electrical tester, and other tools. 5 gallon bucket
Pond pump or small sump pump
Three 6-foot-long hose lines
Pond pump Wrench with a range of adjustment
5 gallons of white vinegar (optional).

Directions

Turn off the power to your unit at the power source. Immediately turn off the main gas supply
All three water supply valves to the heater, including the hot and cold water valves, must be shut off. Locate the cold and hot water valves on the water heater. Remove the purge port valve caps from the purge valves by gently prying them off. Using an adjustable wrench, connect the three hose lines to the three water valves and tighten them down. A long enough hose line must be provided to reach both the water heater and either the bucket or pond pump. Open the purge port valves if necessary. Fill a 5-gallon bucket halfway with water and add the pump and open end of the second hose. 5 to 6 gallons of undiluted white vinegar should be added to the bucket. Activate the hold and cold water valves, as well as the pump in the bucket, in order to pass white vinegar through the heater. Allow the pump to operate for 45 minutes before shutting it down. Ensure that the white vinegar is allowed to drain back into the bucket from the unit through the hoses. Pour the vinegar into the bucket and replace the open-ended hose in the bucket
To begin, open the cold water valve and let the water to pour into the bucket for around 5 to 7 minutes. Detach the cold water hoses from the inflow valves and close the cold water valve
Using a strainer, remove the inlet filter screen and rinse it well to eliminate any dirt. Reinstall the screen if necessary. Replacing the purge port valve caps on the purge valves is necessary. Open a few hot water faucets to allow any trapped air to escape from the hot water pipes. You will hear a sputtering sound, then steady running water, and eventually you will be able to turn off the faucet. Turn on the gas, water, and electricity outlets, and check to see whether there is hot water coming out of the faucets.

Conclusion

Using the information in this article, you will be able to detect and correct issues that may emerge when using a Rinnai tankless water heater. Periodic maintenance, such as flushing and cleaning the unit, will help to lessen the likelihood of difficulties or even failures occurring in the future. Make certain that you get a skilled expert to assist you with the installation.