How To Reset A Tankless Hot Water Heater?

How To Reset Tankless Water Heater 2022 (Complete Guide)

  1. This video will show you how to reset a tankless water heater.
  2. Compared to traditional water heaters, tankless water heaters are more inexpensive and may be used on demand.
  3. With a tankless water heater, you can save money on maintenance.
  4. It does not store hot water, but instead delivers you with warm water whenever the user opens the faucet or the null nozzles.

It is possible that the tankless water heater may become defective or develop certain problems, and it will cease to function.It is simple to resolve the issue of a defective tankless water heater by simply resetting the tankless water heater.It displays the error codes, and you may correct the situation by resetting the device to its default position.Check to see whether there is an issue with the gasket; if there is, you must address it first.

How to reset tankless water heater

  1. It is necessary to unplug and switch off your tankless water heater in order to reset it.
  2. The next step is to locate the location of the reset button and remove the screws and plate that covers the reset button on the computer.
  3. Remove the insulating pad and click the red button labeled ″reset button″ to return to the previous state.
  4. As soon as you hear the click sound, release the button and reassemble everything as it was before you.

To accurately reset your tankless water heater, follow the instructions outlined below.

Unplug your water heater

  1. Before you begin the process of resetting the water heater, it is critical that you turn off and disconnect the unit completely.
  2. Because if you fiddle with the water heater while it is attached to an electrical outlet, there is a high risk of electrical shock or burn.
  3. The heater is available in a variety of designs and approaches; some are linked through a cable with a knob, while others are connected directly to the socket.
  4. Determine the construction of your heater and disconnect it from the power source.

Remove the cover that protects the reset button

  1. Following the disconnection of the power supply, you must locate the location where the reset button is located.
  2. With your hands, raise the heater’s plate and remove it from the bottom.
  3. The ″Reset″ button is located towards the bottom.
  4. Using a screwdriver, loosen the screw and remove the plate.

When in doubt, check for an additional plate or cover, and then remove the plate to reveal the reset button.

Remove the insulation-Pad

  1. After removing the covers, you’ll discover an insulating pad that acts as a protective layer above the reset button.
  2. Remove the insulating pad, which is a foam pad that can be easily removed from the wall.
  3. When inspecting the pad, look for signs of wetness or dampness, since this indicates a gasket leak.
  4. First and foremost, you must repair the leaking gasket, after which you may proceed to reset the heater.

Press the reset button

  1. Usually a red button with a reset label, the reset button is distinguished by its color.
  2. It’s important to press the button firmly with your fingers, else it might be difficult to press.
  3. Press the button inward with all of your effort and keep it there.
  4. When you push the reset button, you will hear a click sound, which signals that the heater has been reset after a few seconds of operation.

There is a problem with the wiring or controller if there is no click sound or the button does not come out when you press the button.Check all of the wires one by one and look for any loose wire netting.If the connections are in excellent condition, it is possible that the controller is defective, and it will be necessary to replace it.Some heaters do not create a click sound, therefore if there is no sound and the button is pressed inward, press the button and release it.Now that everything has been restored, the status has been updated to reset.

Reassemble everything back

At long last, after completing the reset job, it’s time to put everything back together again. Put the insulating pad back in place first, followed by the plates. Screw the screws back into place to ensure that the reset button is securely protected. Now, reconnect your water heater to the outlet and turn it on to ensure that it has been successfully reset.


  • The usage of a tankless water heater lowers the cost and energy required to maintain traditional tank-style water heaters. If you are experiencing problems with your tankless water heater, you can reset the water heater. It is simple to maintain the tankless water heater since it indicates when there is a problem by flashing error codes. Issues such as wiring or a faulty gasket, on the other hand, must be addressed first before attempting to reset the water heater. Guides that are related The water in the Rinnai tankless water heater is too chilly.
  • After turning off the water, the faucet continues to leak
  • The bathtub faucet continues to leak after the water has been turned off.

How do you reset a tankless gas water heater?

  1. By hitting the red button, you may quickly and conveniently reset the electric reset button.
  2. Some units include a lower thermostat reset button, which may be found on some models.
  3. If you find yourself in this circumstance, you must also press the reset button.
  4. When you press the buttons on the water heater, but they don’t immediately reset, it’s possible that certain sections of the water heater are causing the problem.

Given that tankless units only heat water when it is required, running too many hot water appliances at the same time may cause the unit to get overworked and malfunction.Your ″no hot water″ problem, on the other hand, might be the result of a more serious condition, such as: Heat exchanger with a plug in it (due to hard water) The vent/air intake is obstructed.Also, how can I turn my water heater back on?In this second section, we will press the Reset button.

  1. Locate the red reset button on the control panel. In the middle of the control panel, there should be a red button
  2. press the button firmly to activate it. The reset button can become stuck from time to time, especially if you haven’t reset the heater in a long time
  3. however, this is rare.
  4. Wait for the sound of the button clicking.

So, how exactly do I reset my Eemax tankless water heater in this case? To reset this device, follow these steps:

  1. Verify using an appropriate electrical tester that the heater’s electricity has been switched off at the circuit breaker(s) and that the heater has been turned off at the circuit breaker(s).
  2. Remove the heater’s lid and turn it off.
  1. What are the drawbacks of using a tankless water heating system?
  2. The most significant downside of on-demand or instantaneous hot water heaters is the high initial investment required.
  3. The smaller units that are frequently seen will not be able to provide enough hot water to meet the needs of most families.
  4. They can only handle one faucet at a time, which is an issue if you want to take a shower while the dishwasher is in the dishwasher.

How To Reset Rinnai Tankless Water Heater? Complete Guide 2022

  1. If you have a Rinnai tankless water heater, you should be proud of yourself since you have made one of the best purchases you could have made in your life.
  2. For more than two decades, you should be able to rely on the unit to provide steady operation and endless hot water.
  3. Tankless heaters require far less maintenance and service than tanked heaters, but it is still necessary to keep them in excellent working order.
  4. When they encounter difficulties, it is imperative that they understand how to reset Rinnai tankless water heater.

How To Reset Rinnai Tankless Water Heater?

  1. 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.
  2. When all of the warm water fixtures are connected to the same unit, it becomes more difficult for individuals to organize their day.
  3. – An error code will appear on the digital display screen of your appliance if there is a problem with it.
  4. 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.If you are having issues with your Rinnai tankless water heater, our extensive tutorial on how to troubleshoot it will be of great assistance.

Error Codes Of Rinnai Rankles Water Heater

Error Code 2

  1. When your heater is not working properly, it may be really annoying, especially if you have a large number of people living in your residence.
  2. When all of the warm water fixtures are connected to the same unit, it becomes more difficult for individuals to manage their days.
  3. – You will get an error code on the digital display screen of your appliance if there is a problem with it.
  4. The error code will tell you what the problem is with your appliance.

A issue may be identified and resolved immediately when an error code is provided.If you are having issues with your Rinnai tankless water heater, our extensive guide on troubleshooting it will be of great assistance.


In the event that you cannot solve the problem yourself, it is highly suggested that you seek expert assistance.

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.


  • To begin, switch off all of the electrical outlets that are connected to the unit in your home. The water should not be allowed to pour out.
  • After that, go to the temperature controller and push the On/Off button on the device twice. 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.


  • 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 activated, the error code will be removed.
  • If, on the other hand, the problem persists, the bypass valve should 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.


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. The appliance may suffer serious damage as a result of the air supply issue.


  • 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.
  • It is also necessary to 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.


  • Make sure that the valve, water heater, gas meter, or cylinder are all in working order. If possible, turn off all of the fixtures while keeping the power on so that you may verify the deflection.
  • Now, examine the igniters to see whether or not they are performing properly.
  • Even if everything appears to be working properly, if you are still not getting hot water, call a professional.

Error Code 12

This error indicates that there may be a flame or an electrical failure in the system. Once again, this is a problem that involves natural gas and natural gas pipes. As a result, before proceeding to the remedy, it is necessary to first diagnose the problem.


  • 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 machine from the power source, detach the circuit board, and 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

This code indicates that there is a problem with the combustion process.


  • Make a visual inspection for B-vent materials and ensure that they are properly deployed. Then examine the remainder of the venting systems to see 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.


  • For Rinnai tankless water heater troubleshooting, the bi-metal switches attached to the heat exchanger’s top should be examined.
  • 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. If the switches are not functioning properly, they should be replaced.
  • 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.


  • 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.
  • Next, remove all of the clogs and obstructions within the heater, as well as determining where they are located.
  • 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.


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

See also:  How To Install Water Pump With Pressure Tank?

Error Code 25

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


  • 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 there are no obstructions.
  • 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.


  • 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. If you are unable to inspect the sensors, contact an expert to replace the sensors. )

Error Code 33

This indicates that the heat exchanger is not functioning correctly.


  • Turn off the electricity and check the connections that are present within 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.


  • The 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, and both low and high fire pressures should be monitored.
  • Finally, any dip switches that are present in the circuit should be checked for proper operation. Replace the PC board as well as the CO sensor at this point.

Error Code 41

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


The first step is to inspect the circuit and identify any broken or damaged wirings. After that, check to verify if the sensor is protected by insulation or not.

Error Code 52

This mistake arises in areas where there is a lot of air pressure. This issue is associated with the modulating solenoid valve, or it might be caused by the POV valve not functioning properly.


  • 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.


  • First and foremost, turn off the electricity and then turn off the hot water faucets. Check to see that there is no air pressure.
  • Check the PC board for broken or damaged cables, as well as faulty or 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. If the engine continues to run, there may be a problem with the housing.
  • It will be necessary to replace the fan wheel and housing in such a circumstance if there are no obstructions present. 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.


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.


  • Initially, inspect the wire harness that connects the flame rods and search for any damaged or loose connections before proceeding.
  • When the heater ignites, check the flame rod for damage. Any flame should be extinguished immediately, and the flame rod should be removed before searching for and clearing any carbon deposits from the machine.
  • At the end of the day, examine the burner for rust and remove it.

Check out this article on how to flush a Rinnai tankless water heater as well.

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.


  • 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 any dips near the device’s base, this indicates that the heater is experiencing an internal problem.
  • In such a circumstance, the machine should be dismantled and the interior cabinet should be examined to see if it is completely soaked or not.
  • In the end, the specific internal pipe should be replaced, and the leak sensor should be dried up completely.
  • The heater should be restarted when it has been completely drained out of its water supply.

Error Code LC0 To LC9

The amount of limescale present in the tankless water heater is indicated by the codes on this page. The higher grade indicates that the gadget has a greater quantity of limescale than is typical.


  • 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 bleed so that you may reset the appliance and get the code erased.
  • You will, however, need to call a professional if the error is still present so that he may check the filter and determine whether or not limescale has been removed.
  1. In conclusion, smart tankless water heating equipment are becoming increasingly popular in both commercial and residential premises.
  2. Although they are equipped with superior technology to deal with any problems that may arise, they are no different than any other appliance.
  3. Fortunately, they include error codes that may be simply deciphered in order to determine the various remedies.
  4. Things will get straightened out for you if you follow our instructions on how to reset the Rinnai tankless water heater.

To summarize, if you want to get the most out of your equipment, we always recommend that you rely on expert services.

How to Reset a Tankless Water Heater? – Detailed Tutorial

  1. Have you noticed that your tankless water heater is no longer providing you with hot showers, hot water for your dishwasher, and other needs?
  2. Are you considering flushing your system to remove sediments and other contaminants that have accumulated in the coils?
  3. If you know how to reset a tankless water heater, addressing these difficulties will be a piece of cake.
  4. Good news is that tankless water heaters are easier to reset than traditional tank water heater systems, making them more user-friendly.

These appliances include a dedicated button that allows you to reset the item without having to remove anything else from it.Come along with me as I demonstrate the simple four-step procedure for resetting a tankless water heater.

Things You Will Need for This Guide

The process of resetting a tankless water heater is not as difficult as you may expect. This water heating equipment, after all, is both smaller and more compact than a traditional tank water heater. It should be a simple matter to locate the reset mechanism. You may, however, make the procedure more uncomplicated by putting together the following items in advance.

User Guide

  1. It is never a good idea to underestimate the importance of a model-specific user guide or owner’s handbook in your collection.
  2. Although it contains extensive directions on how to locate the device’s reset button, the user guide also specifies the correct reset method for the model in question, which is very useful.
  3. Unfortunately, some of us may already have misplaced our user guide.
  4. We apologize for any inconvenience.

Never be concerned since the internet is always available to assist.You may discover printable user instructions in PDF format that are particular to your tankless water heater’s brand and model on this page.Community forums are also a great source of information for the general public.Members will be able to assist you with your query if you simply post it on the website.

Understanding of the Need for Resetting a Tankless Water Heater

  1. There are a variety of reasons why a tankless water heater should be reset.
  2. Resetting this appliance is always an important step in the process of draining out the device.
  3. It is possible to flush the tankless water heater’s heating elements and other components to remove sediments, limescale, hard mineral deposits, and other particles that have accumulated on the inside of the tankless water heater.
  4. It is possible to return the water heater to its factory default settings once it has been flushed.

When troubleshooting a tankless water heater, it is also important to reset the unit.While contemporary tankless water heaters are simple to operate, troubleshooting them can be difficult for certain individuals due to their complexity.Pressing the reset button is always quicker and less time-consuming than going through the numerous troubleshooting methods and steps.The opposite is true if your tankless water heater requires regular resets; in this case, it may be necessary to have it checked out by a qualified technician.It is possible that it has a problem that should be investigated further and that a more permanent solution than merely restarting the water heater is required.

Steps for Resetting a Tankless Water Heater

Step 1. Cut off the power to the tankless water heater.

  1. Tankless water heater manufacturers recommend that you turn off the appliance’s electricity before working on any of its electrical parts.
  2. You should consult the tankless water heater user handbook for model-specific instructions if you are in any doubt.
  3. It is necessary to hardwire a tankless water heater system to a dedicated circuit breaker in order to install it.
  4. Ideally, the water heater circuit breaker should be labeled, so that the user does not have to go through the trouble of turning off the entire circuit breaker panel.

Check your breaker panel for the circuit breaker that regulates the energy to the tankless water heater and turn it off if you find it.Set this circuit breaker to the ″OFF″ position to turn it off.

Step 2. Locate the tankless water heater’s reset button.

  1. Tankless water heater reset buttons are installed in a variety of positions by different companies.
  2. As a result, it is recommended that you consult your user manual to establish the actual placement of the reset button.
  3. Alternatively, if you no longer have a copy of the owner’s handbook, you might try looking for and downloading it from the internet.
  4. The majority of manufacturers make their user instructions available as downloadable PDF files.

Alternatively, you may post a question on online discussion boards.Some members may have the same tankless water heater as you, and they may be able to advise you on where to look for the reset mechanism in your unit.Most tankless water heaters feature a reset button on the front or side of the device, depending on the model.The majority of the time, it is located on the control panel.Because tankless water heaters are small, it is simple to identify a red button with the word ″reset″ written on it.

Step 3. Press the reset button.

  1. The following step entails pushing the Reset button on the keyboard.
  2. It would be prudent to exercise patience because it is possible that the gadget may take some time to reset.
  3. It may be difficult to press the button in some conditions due to the sticky nature of the button.
  4. This is common with tankless water heaters that are only seldom reset.

Listen for the sound of a click, which indicates that the tankless water heater has been successfully reset.RV Dude has a great video on how to reset a tankless water heater that you should see.Despite the fact that the video is about resetting an RV water heater, the technique is nearly identical to that of resetting a tankless water heater for the home.

Step 4. Reestablish power to the tankless water heater.

  1. To proceed, press the reset button on your computer’s keyboard.
  2. It would be prudent to exercise patience because it is possible that the gadget may take some time to restart.
  3. The fact that the button is sticky may make it difficult to press in some circumstances.
  4. This is especially common with tankless water heaters that are only sometimes reset by the owner.

Attempt to hear the sound of a click, which indicates that the tankless water heater has been successfully reset.Resetting a tankless water heater is a simple process, as demonstrated by RV Dude.Despite the fact that the video is about resetting an RV water heater, the procedure is nearly identical to that of resetting a tankless water heater for the home.

Some Notes on Resetting Specific Tankless Water Heater Brands

The methods we detailed above may or may not be applicable to the brand of tankless water heater you now own. In order to obtain more thorough model-specific instructions, I always recommend consulting the manufacturer’s user handbook. However, there are a few variations to the reset method for some tankless water heater manufacturers that you should be aware of.

Rinnai Tankless Water Heaters

  1. Rinnai tankless water heaters always have an error code displayed on their control panel or module when they are operating.
  2. The error code might be anything between 02 and 79.
  3. It can also contain non-numerical data, such as LC, FF, LC-LC, and No Error Code, among other things.
  4. Upon resetting the device, these error codes are removed and the equipment is returned to its factory settings.

Check the ‘Control-R’ module on a Rinnai tankless water heater to see whether it needs to be reset.It reverts the tankless water heater back to its original factory settings.To connect to the module, locate the Connect button on the module and push and hold it down until the flickering LED light turns solid white.By then, you should be able to release the Connect button.

See also:  Why Is My Water Heater Making A Knocking Noise?

Marey Tankless Water Heaters

If you wish to reset your Marey tankless water heater, you must first turn off the electricity to the appliance by turning off the circuit breaker on the wall. After that, you may reset the device by pressing the reset button until it clicks. Once the tankless water heater has been reset, it is possible to turn it back on.

Noritz Tankless Water Heaters

By pushing the reset button on the front panel of a Noritz tankless water heater, you may restore the device to its factory settings. This is something we do frequently as a more easy solution to various error codes on the computer.


  1. Learning how to reset a tankless water heater is as simple as pushing the red’reset’ button on the tankless water heater, however certain types may need you to first turn off the tankless water heater’s circuit breaker.
  2. I hope this has made you feel more confident in handling any concerns you may be experiencing with your tankless water heater.
  3. Even while rebooting the device might resolve minor issues, I strongly recommend consulting with a specialist if the issues linger.
  4. What are your thoughts?

Is there anything I’m missing?Please feel free to contact me with any problems or questions you may have regarding this instructional.I would also really appreciate it if you could forward this article to your colleagues and friends.

How to reset tankless water heater – Complete Guide

  1. There may have been times when you had a difficulty and needed to call a plumber.
  2. The plumber arrived, messed about with the most basic of issues, reset the device, and then charged you hundreds of dollars.
  3. Therefore, you must conduct some study and set aside some of your hard-earned money.
  4. Though restarting a tankless water heater can be done several times, there is a certain order in which things should be done.

Having to reset your tankless water heater on a regular basis might feel akin to beating a horse in order to make it go faster.The truth remains, however, that the fundamental problem has not been addressed or resolved.As a result, you must investigate the situation and take appropriate action.First and foremost, the problem must be resolved.It may be necessary to reset your tankless water heater if all else does not work.

Let’s discuss “How to reset tankless water heater”

Tankless Water Heater Reset button

  1. A reset button on a tankless water heater is used to restart the device and also serves another purpose.
  2. It serves as a safety feature, tripping and shutting off the unit if the water gets too hot or if there is a lot of power outage.
  3. It shuts down the unit and protects it from any potential harm that may occur if it were to continue to operate in its current state.
  4. There are three typical methods for resetting a tankless water heater that you should know about.

One method of resetting the tankless unit is by pressing the red button on the device.The second most typical method of resetting the device is to turn it off by pressing the power button for 5-10 minutes, then turn it back on.The third method of resetting the tankless water heater is to use the buttons on the thermostat.Typically, a tankless water heater reset button is a red button that you may press to restart the unit after it has been damaged or turned off.It is normally displayed on the display screen, but you may have to remove the panel in order to see it.

The reset button is normally functional, albeit it may require a long press and hold to be effective on occasion.In certain circumstances, the lower temperature button is used in conjunction with the higher temperature button.You can find out the best approach to reset your tankless water heater by reviewing the owner’s handbook.In the event that you have misplaced your owner’s manual and are unable to recall where you last saw it, you may always look it up online.

Why does a tankless water heater need to be reset?

1.      Broken Thermostat

  1. The tankless water heater reset button may be triggered if the water in the tankless unit becomes too hot or if the heat exchanger is damaged in any way.
  2. Tankless water heaters are often controlled by a thermostat, which determines when and at what degree the water should be heated.
  3. If the thermostat fails to perform its duty, the tankless unit will continue to heat the water to a higher temperature until the problem is resolved.
  4. After that, the process will be repeated until the water temperature reaches 180°.

It will be detected by the reset switch, which will safeguard the tankless unit.You may now restart the tankless water heater to get the device up and running again, but you will run into the same problem again after a short period of time.As a result, changing the thermostat is the most appropriate course of action.Instead of spending money out of your own pocket to replace a part, check your tankless unit’s warranty.

2.      Heating element crack

  1. If there is a breach in the heating element, it is possible that the live wires attached to the element will be exposed to the water and cause a fire.
  2. In this instance, even if the thermostat attempts to turn off the heating element, the water may continue to heat.
  3. If the thermostat tries to turn off the electricity, the heating element will still continue to run.
  4. As a result, the temperature of the water rises over the predetermined temperature.

After a period of time, the reset button may trip, causing the device to lose power in order to safeguard it.Even if you use the reset button to restart the machine, the tripping alarm will continue to sound until the heating element has been replaced.

3.    Electrical issue

  1. The live wires attached to the heating element may get exposed to water if there is a break in the heating element.
  2. This means that even if the thermostat attempts to turn off the heating element, the water may continue to heat.
  3. In this instance, the heating element continues to work even if the thermostat attempts to turn off the electricity.
  4. As a result, the temperature of the water increases over the predetermined level.

Eventually, the reset button may trip, cutting off the power to the machine in order to safeguard it from being damaged.Even if you use the reset button to restart the machine, the tripping will continue as long as the heating element isn’t changed.

4. Error Codes

  1. A tankless water heater is comprised of two parts.
  2. Both parts are divided into two categories: the computer portion (which appears on the LCD screen), and the remainder of the machine (heat exchanger, fan, vents, etc.).
  3. In the same way that a computer displays error codes when a problem occurs, a tankless unit will do the same.
  4. That is why tankless water heater error codes are useful in identifying and resolving problems with the unit.

The most recent tankless water heaters are equipped with error codes that indicate whether or not the tankless water heater is experiencing a problem.The error codes generated by tankless water heaters are quite adaptable and may be used to identify small issues.These codes can indicate whether or not there is a water leak, whether or not the water temperature is excessively hot, whether or not the heat exchanger is operating or not, whether or not there is a blockage in the supply lines, whether or not the tankless thermostat is working, and so on.Each brand has its own set of codes, which are highly different and may differ from one another.Consult your owner’s handbook for the most up-to-date information on what each error code means.

Some issues are simple enough to fix on your own, while others require the intervention of a specialist or plumber.A reset of the tankless water heater can also be used to address some of the trouble codes listed above.

Frequently Asked Questions

  1. Do tankless water heaters include a button that allows them to be reset?
  2. Yes, almost all tankless water heaters are equipped with a reset button.
  3. As a safety feature, this reset button is an integral element of a tankless system and cannot be overlooked.
  4. It safeguards the unit from harm caused by very hot water by shutting it off as soon as the water temperature reaches a preset temperature limit.

The tankless device can be damaged if its water temperature exceeds this temperature limit.A Rinnai tankless water heater’s reset button may be found at the following location: The power button on the Rinnai tankless water heater may be used to reset the unit.Please remember to first drain all of the water from the unit before to doing so.Closing the cold-water valve while leaving the hot-water valve open is the right method for accomplishing this.Drain the hot water from the device using any available fixture.

After that, switch the device on and off twice more by pressing the power on/off button on the remote control.Close the hot-water valve for a minute or two before opening the cold-water valve.Inspect the faucet to see if you are receiving warm water or not.The Rinnai tankless water heater has been successfully reset if you answered yes to the previous question.If it does not work the first time, you may need to try it again a number of times.

  • Is it possible to damage your tankless water heater if you do not flush it?
  • Unless you flush the tankless water heater unit, it will continue to accumulate dirt and sediment inside it, causing it to malfunction.
  • The dirt that has collected will eventually settle on the heat exchanger.
  • The heat exchanger is thus unable to transport heat as a result of this.


  1. The process of resetting a tankless water heater in 2022 is quite straightforward; the most difficult part may be locating the reset button.
  2. A tankless water heater reset button may be located on the display screen, near the thermostat, or inside the circuit, in which case you may need to remove the control panel in order to access it.
  3. Once you’ve located it, all you have to do is press it; you may need to hold it for a short period of time.
  4. One of the reasons for this is that certain tankless water heaters are equipped with an accidental press function that does not recognize a single press command but rather a press and hold command.

If none of the above methods work, you can try pressing the reset button in conjunction with the thermostat button to reset the tankless unit to its factory settings.If all else fails, it is possible that the faulty reset button will need to be replaced.

How To Reset Tankless Water Heater: 4 Easy Steps

  1. In order to give an unlimited supply of hot water, tankless water heaters are constructed.
  2. The question becomes, however, what to do in the case of a power outage or other incident that causes the unit to lose energy and how to restore it to full operation.
  3. It’s possible that you’ve heard that tankless water heaters don’t have a pilot light like a traditional water heater.
  4. The good news is that your tankless water heater is equipped with a reset button that will allow you to power it back up once again.

These detailed instructions will walk you through the process of resetting your tankless water heater.

How to reset a tankless water heater: 4 quick steps

Step 1 – Locate the tankless water heater reset button

  1. The placement of the reset button on your water heater can vary based on the brand and model of your water heater.
  2. When it comes to tankless versions, it’s usually situated on the side or front of the unit, but you should double-check your owner’s handbook to make sure.
  3. If you are still unable to locate it after several minutes of searching, contact the customer care department of your water heater supplier.

Step 2 – Verify that the tankless water heater reset button is in “Reset” mode

  1. The reset button must be pressed a second time to enter ″reset″ mode before the heating process can be restarted.
  2. To do so, push the button once more.
  3. When everything is done correctly, the light will change from red to green.
  4. You must wait 10 seconds after it has completed this task before continue.

If there is still no electricity coming to the device after that, contact a professional since your tankless water heater may be experiencing a more serious problem.

Step 3 – Turn the thermostat up

  1. Typically, there is a knob on the side of your tankless water heater that allows you to raise the temperature of the unit.
  2. By turning the knob in a clockwise direction until it reaches its highest position, the machine will be able to operate at its maximum capacity once more.
  3. Wait a further ten seconds before turning on any other appliances or using those that require hot water once again.
  4. It is possible that failing to do so promptly can result in difficulties with the operation of your tankless system in the future as well as other problems in your house.

Step 4 – Check for a power outage in house

  1. Not the performance of your tankless water heater, but the overall operation of your home’s electrical system, is most likely the source of the problem.
  2. External factors, such as a downed power line on the street in front of your house or a problem with the quality of your electrical supply, may have contributed to your energy loss occurring across your entire home rather than just your tankless water heater.
  3. So, what is the solution to this problem?
  4. Turn on a circuit breaker.

The majority of individuals are concerned with the manner in which the breakers have been switched off.You’ll need to switch each one of them back on individually in order to restore electricity throughout your home.What matters is that the tankless water heater switch is turned back on and can be quickly reached in case there is another power loss in the future, no matter which breaker you use.After that, turn on the heat once again and wait for it to come back to life again.You should consult a professional if you are still unable to get electricity from your tankless system despite following these instructions to the letter.

This is likely not an isolated incidence but rather a symptom of a broader problem.I hope you found this information useful!Although this blog post was written especially about how to reset a tankless water heater, the procedures described here may be used to reset any other type of water heater in your house, including immersion and tankless models.Check out some of our other helpful ideas for maintaining your household appliances!

How to Reset Rheem Tankless Water Heater – Quick Fix

  1. The majority of the time, a well maintained Rheem tankless water heater will function properly.
  2. However, if they become malfunctioning on sometimes, you may need to reset them to their factory settings.
  3. When it comes to resetting a Rheem tankless water heater, the procedure is simple, safe, and quick.
  4. To begin, check to see if the unit is operational.

After that, open the front panel and look for the red reset button, which should be near the thermostat.Hold it in place with your fingers until it snaps into place.The device should be able to return to regular functioning.The following sections provide an overview of the different reasons you might need to reset your Rheem tankless water heater, as well as step-by-step instructions for resetting and answers to associated FAQs.

See also:  How To Start Rv Water Heater?

Why Do I Have to Keep Resetting My Tankless Water Heater?

The following are some probable reasons why you may need to reset your Rheem tankless water heater on a regular basis.


  1. Water heaters are designed to provide a specified amount of hot water.
  2. Whenever your need for hot water exceeds the capacity of your water heater, it will only provide cold water until your demand for hot water decreases.
  3. The device may continue to produce cold water even if you turn off some of the faucets or turn off some appliances.
  4. In this case, resetting the device to its factory or default settings would be the best remedy.

Related: Rheem Water Heater – Troubleshooting Guide (Extended Edition)

The Reset Button Keeps Tripping

  • The reset button is a critical safety feature found on the majority of water heaters. If one or more parts of the device are not functioning properly, the remote button will trigger and remove power to the machine. This brings the unit’s activity to a halt, avoiding further problems such as fire threats while the heater is overheating from occurring. Verify if the reset button has been tripped by inspecting the electrical panel in question. If you want to check if the water heater is on or off, look for the circuit labeled ″water heater.″ Typically, when the reset button is pressed, the circuit breaker is activated as well. A result of this is that the socket is turned off. The following are the most typical causes of your Rheem water heater’s reset button tripping: 1. Incorrectly programmed thermostat
  • incorrectly wired thermostat
  • insufficient heating element
  • faulty reset button
  • insufficient high-switch limit
  • Incorrectly programmed thermostat

If There Is an Error Code Displayed

  • When a Rheem water heater is malfunctioning, it will occasionally just display the appropriate Rheem trouble code. Other times, it may be necessary to reset the unit and turn it off. The following are the most typical Rheem water heater fault codes that might result in the reset button being triggered: Error number 00 indicates that the water heater is running continuously.
  • Error number 05 indicates an insufficient flow of air into the combustion chamber, which may be caused by a clogged vent exhaust.
  • Code 11 indicates an ignition failure that may be caused by a malfunctioning igniter, partially opened or closed valves, excessive gas pressure and volume, an open or short-circuited gas solenoid valve, or an excessive gas pressure and volume.
  • Specifically for indoor Rheem tankless water heaters, error number 13 is shown. It implies incorrect combustion, which might be caused by a faulty flame rod or fan motor, or by a lack of sufficient air intake.
  • It indicates that the heat exchanger has been operating at a temperature of 207F or higher for more than 15 seconds and is the result of an airflow restriction to the combustion chambers, a faulty heat exchanger, or foreign materials in the combustion chambers and exhaust pipes. It indicates that the heat exchanger has been operating at a temperature of 207F or higher for more than 15 seconds and is the result of an overheated film wrap. A buildup of limescale in the unit, a clogged cold water inlet pipe, a faulty heat exchanger thermistor, a partially open water heaters inlet valve, or a partially closed water heaters inlet valve are all possible causes of this error code. Error code 16 – Indicates that the outlet water temperature is higher than the thermostat setting. It is possible that this error is caused by limescale build-up in the heat exchanger, airflow restriction, a faulty outlet thermistor, or a faulty heat exchanger thermistor
  • Error code 24 – Switch malfunction that may be caused by a broken or faulty control board, or by a faulty switch
  • Error code 76 – Communication fault with a remote control that may be caused by damaged or lost connections on the remote control wiring
  • Error code 80
  • Blocked venting and exhaust flues, clogged heat exchangers, clogged combustion, and/or clogged intake filter are all causes of the blower motor not venting properly. Error code 99 indicates that the blower motor is unable to vent.

How Do I Reset My Tankless Water Heater?

A step-by-step procedure for resetting your Rheem water heater is provided below:

  1. Find the water heater circuit on the electrical panel by going to the panel. If it has been turned off, turn it back on.
  2. Remove the lid from the panel and look beneath the insulation for the reset button.
  3. Then press it inwards until it snaps into place, and then let go.
  4. Replace the panel cover with a new one.
  5. If the gas valve has been unplugged, it must be reconnected.
  6. The water heater should be able to turn on and function properly. If there was an error code before to resetting, it will disappear if the issue has been rectified
  7. otherwise, it will remain.

What Should I Do If Resetting my Rheem Water Heater Does Not Resolve the Issue?

  1. It is possible that you may need to push the reset button up to three times in order for the problem to be resolved.
  2. However, in the majority of circumstances, a single reset should be sufficient to restore functionality to your tank or eliminate issues.
  3. If the reset does not work, you should call a professional plumber or a water tank specialist to get it corrected.
  4. Keep in mind that if there is an electrical failure, it may be fatal, especially if you attempt to fix the heater yourself and the water comes into contact with the electricity or vice versa, which is dangerous.

If you want additional assistance, please contact Rheem customer care.It is possible that the firm may send a technician to your home or provide a recommendation.As a bonus, check your Rheem water heater warranty documentation to determine whether you qualify for free labor or replacement components under the terms of the warranty.

Where Is the Reset Button on a Rheem Hot Water Heater?

  1. The reset button on Rheem water heaters is often a red button that is positioned near the thermostat, in the middle of the limit switch, and it can be found on most models.
  2. It will be necessary to remove the metal panel on the unit in order to have access to it.
  3. The red button may be found beneath the insulation on the wall.
  4. If it has tripped, it is normally in the up position, and you will need to press it inwards to return the device to its original position.

Why Is My Rheem Tankless Water Heater Not Working?

  • The following are the most typical reasons why your Rheem tankless water heater is not functioning: Tripped circuit breakers and the reset button due to system overload
  • blown fuses and the reset button.
  • Thermostat and thermistors that are not working properly
  • Vents and air intake pipelines that are clogged
  • The accumulation of sediment and lime
  • Valves that are closed or partially closed
  • no gas supply
  • unsecured wiring connections
  • Heating elements that have been short-circuited
  • High limit switch that is not working properly
  • short hot water draws, and so forth.


A reset of your Rheem tankless water heater may be necessary if it has been overloaded, has shown an error code, or the reset button is constantly tripping. If the problem remains even after you’ve reset the water heater, contact the manufacturer or a professional water heater specialist for assistance.

How to Reset a Tankless Water Heater

  1. Whenever your tankless water heater fails to function properly, you’ll want to get it repaired as quickly as possible.
  2. Nobody enjoys taking a cold shower, and using hot water makes it simpler to complete many home activities.
  3. You should begin by attempting the most frequent solutions.
  4. This is particularly true in the case of electrical installations.

Learn how to reset the tankless water heater if you want to keep it working properly.If the pilot light on a gas unit goes out, you’ll most likely need to relight it (you may need to flush it and change the filter first).When you’re working with an electric device, you’re usually dealing with a far more basic answer.

Find the Reset Button!

  1. It’s possible that your water heater is emitting an error code that tells you what the problem is.
  2. Consult your user’s handbook to see what the error message is attempting to communicate.
  3. It’s possible that a reset will not resolve your problem completely.
  4. If a reset is the proper solution, then go ahead.

The majority of brands and models offer an intuitive user interface that makes it simple to locate the reset button.If you are unable to locate the button by eyeballing it, go to the instructions once again.As a precaution against unintentional resets, tankless water heaters are intended to avoid accidental resets.As a result, you will almost certainly have to hold the button down in order for the reset to activate.

Quality Manufacturing Makes All the Difference

  1. Even the most advanced engineering will produce water heaters that keep their long-term integrity while still providing straightforward answers when troubleshooting is required.
  2. In order to avoid this, we recommend choosing from reputable brands that we stock here at PlumbersStock, such as Bradford White, Takagi, and Noritz, among others.
  3. These vendors create solutions that are simple to use for homes.
  4. If you found this information to be useful in learning how to reset a tankless water heater, please spread the word to your friends and family members.

Resources that are related to this topic include: How to Flush a Tankless Water Heater (with Pictures) How to Calculate the Size of a Tankless Water Heater Ventilation of a Tankless Water Heater Installing a Tankless Water Heater – Step by Step Instructions

Why Is My Tankless Water Heater Not Heating?

  1. Tankless water heaters often provide a number of advantages under normal situations.
  2. These sorts of water heaters are well-known for saving households money while also producing hot water more fast than other types of water heaters do.
  3. However, if your tankless water heater is not heating effectively, it may make for a very miserable day—especially if it fails to function when you have friends or other visitors around.
  4. In the event that your tankless water heater is not heating, there are various possible explanations.

Sediment Buildup

  1. Mineral deposits can accumulate in your water heater and throughout your plumbing system as a result of normal use.
  2. In particular, if your water supply is ″hard,″ meaning it has a significant concentration of minerals, you should avoid using it.
  3. When this occurs, water transports minerals such as magnesium, calcium, and other minerals with it wherever it travels.
  4. Your water heater, pipes, water filter, and other components of your home’s plumbing system are included in this category.

It is possible for minerals to accumulate in such a thick layer that they begin to obstruct water flow through your system, diminish the amount of water pressure, and prevent your water heater from functioning correctly.It is especially vital to inspect tankless water heaters for sediment building on a frequent basis, since this type of device is particularly susceptible to sediment accumulation.It’s also necessary to descale them at least once a year to ensure that they continue to function at their peak for as long as feasible after installation.In the event that you have to descal your water heater more than once a year, it might be because you have hard water.

Too Many Hot Water Fixtures Being Used at Once

  1. The usage of too many hot water fixtures at the same time in your household might give the impression that your tankless water heater is not heating adequately, which can be misleading.
  2. For example, if you and a houseguest attempt to take hot showers at the same time as your child is attempting to wash dishes, your water heater may get overloaded.
  3. When your shower begins off hot, but then the cold water starts running for a long before the hot water returns, you have an issue similar to this.
  4. This can occur if you are utilizing a fixture that is located a long distance away from your water heater or if you have numerous persons attempting to utilize hot water simultaneously.

There may still be some hot water remaining in the pipes, but it is unlikely that there will be enough water to take a complete shower with.It is likely that once you have ran through the hot water that has remained in the pipes, you may experience some cooler water coming through before the heater has a chance to pump out any more hot water.If this is only happening once or twice a week, you might try using fewer appliances at the same time to see if this resolves the situation.However, if your water heater is still not heating, it is possible that you are dealing with another issue.Suppose the water heater shut down due to a high level of demand on the system If this is the case, then resetting the device should resolve the situation.

Alternatively, it is possible that your tankless water heater is insufficiently large to provide sufficient hot water for your home.As a result, you may want to consider purchasing an extra water heater or replacing your present water heater with a one that has more storage capacity.

The Air Supply or Exhaust Is Blocked

  1. It is possible that your exhaust or air supply can become clogged, resulting in your tankless water heater ceasing to function properly.
  2. Many water heaters will automatically switch down in order to safeguard the appliance and to assist prevent potential safety dangers that might occur as a result of the malfunction.
  3. One of the possible causes of this problem is that a vent pipe has been disconnected or has a hole in it.
  4. The same thing might happen if your water heater is put too close to another appliance or other object.

Additionally, even if your water heater was first installed with sufficient clearance around it, it is likely that something has gotten in the way of its operation.For example, an animal or pest such as a wasp might have infiltrated the system’s area by constructing a nest or other barrier that is now obstructing the system’s air supply or exhaust venting.

Failed Ignition

  1. It is also conceivable that you are experiencing no hot water in your home as a result of an ignition failure.
  2. If your water heater displays an error message, this is a solid sign that you may be experiencing an ignition problem.
  3. This most frequently occurs when there is a problem with the supply, such as when the propane tank is running low or when the water or gas valves are not open properly.
  4. However, an ignition failure can also be a symptom of a more difficult or hazardous problem, such as an electrical hazard, which should be addressed immediately.

As a result, if you receive an error notice, it is essential to call a plumbing specialist immediately.They can assist you in determining what is wrong and can safeguard your family by r

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