How To Reset Tankless Water Heater

How to Reset a Tankless Water Heater

It is important to get your tankless water heater repaired as soon as possible if it stops working. Nobody enjoys taking a cold shower, and using hot water makes it simpler to complete many home activities. You should begin by attempting the most frequent solutions. This is particularly true in the case of electrical installations. It is necessary to understand how to reset the tankless water heater. 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).

Find the Reset Button!

It’s possible that your water heater is emitting an error code that tells you what the problem is. Consult your user’s handbook to see what the error message is attempting to communicate. It’s possible that a reset will not resolve your problem completely. If a reset is the proper solution, then go ahead. The majority of brands and models offer a user-friendly interface that makes it simple to locate the reset button when necessary. If you are unable to locate the button by eyeballing it, go to the instructions once again.

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

Even the most advanced engineering will produce water heaters that keep their long-term integrity while still providing straightforward answers when troubleshooting is required. We recommend that you pick from reputable brands such as Bradford White, Takagi, and Noritz that we sell here at PlumbersStock in order to ensure a successful installation. These vendors create solutions that are simple to use for homes. 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.

How to Reset A Tankless Water Heater

In the event that your heating or air conditioning system requires repair or replacement, we can link you with a dependable and cost-effective specialist in your region. Consider the following scenario: you switch on the hot water faucet and wait a couple of seconds for it to heat up, but the water still does not come out hot. Does this sound familiar? When you go into the shower and have to wait more than a minute for the hot water, it’s a really unpleasant experience. Unfortunately, it’s possible that it’s occurred to everyone, and it’s a quite typical occurrence, particularly for electric vehicles.

What should you check if that happens?

The first thing to do is to make sure the water heater’s reset switch is working properly. Many different tankless water heater types are available on the market, but in most cases, a red button on the upper thermostat of your electric water heater will activate it. In certain cases, you may need to remove a tiny panel in order to get to it. If the button is illuminated, it indicates that the switch has been tripped and that you must perform a reset. By hitting the red button, you may quickly and conveniently reset the electric reset button.

If you find yourself in this circumstance, you must also press the reset button.

There are a variety of reasons why the reset switch may trip, and one of them is due to the water becoming too hot to handle. A defective thermostat in either the top or lower heating element might possibly be the source of the problem.

One last thought

The thermostats aren’t the only components that might fail, resulting in the reset button being triggered. This is especially true if you find yourself having to reset the device more frequently than you anticipated. Here are various scenarios in which you may find yourself needing to reset the button:

  • The wiring in a heating element is loose, which is why the heat trips the high-limit switch
  • Nevertheless, the high-limit switch is not in excellent working order to begin with. When the high-limit switch begins to fail and overheat the water, the likelihood of the switch being activated increases dramatically. It is possible that a short has occurred in a heating element. If this is the case for you, the thermostat may continue to function normally, but the power shortfall will not be alleviated. Nonetheless, the water heater may heat the water to a temperature over the recommended level, triggering the high-limit switch
  • It is also conceivable that the heater is not responsible for the troubleshooting. It is also possible that the electrical system in your home is the source of the problem.

As soon as a circuit breaker trips and must be reset, the water heater will cut off the electrical supply. If the equipment continues to trip the circuit breaker, it is recommended that you seek expert assistance. He or she will inspect the tankless water heater and the circuit breaker, checking for any problems with other electrical equipment that are linked to the same switch as the tankless water heater. We are confident in our ability to link you with a reputable service in your region that can repair, replace, or maintain your heating and air conditioning systems.

How to Reset Rheem Tankless Water Heater – Quick Fix

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

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.


Water heaters are designed to provide a specified amount of hot water. 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. Although certain faucets and appliances may be turned off, the unit may continue to generate cold water. 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

Most water heaters include a reset button that is an important safety feature. 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.

  • Thermostat that is not working properly
  • A loose electrical connection The heating element has a short circuit
  • Faulty reset button
  • Faulty high-switch limit

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. It is possible that the clogged vent exhaust is causing the insufficient flow of air into the combustion chamber, which is indicated by error code 5. Code 11 indicates an ignition failure that can be caused by a variety of factors including partially opened or closed valves, high gas pressure and volume, an open or short-circuited gas solenoid valve, and a faultyigniter. It is only applicable to indoor Rheem tankless water heaters that this error code exists. 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 is possible that an airflow restriction to the combustion chambers, a faulty heat exchanger, or foreign materials in or around the combustion chambers and exhaust pipes will result in an overheated film wrap. Error code 15 indicates that the heat exchanger has been operating at a temperature of 207F or higher for more than 15 seconds. A buildup of limescale in the unit and a blocked cold water intake line, a defective heat exchanger thermistor, or a partially open or closed water heaters inlet valve may all be to blame. Error code 16- Indicates that the outlet water temperature is higher than the thermostat setting. A build-up of limescale in the heat exchanger, an airflow obstruction, a malfunctioning outlet thermistor, or a malfunctioning heat exchanger thermistor are all possible causes of this mistake. Code 24- Switch malfunction, which may be caused by a damaged or malfunctioning control board, or by a faulty switch. Communication failure with the remote control, which may be caused by damaged or lost connections on the remote control wiring
  • Error code 99, which indicates that the blower motor cannot vent due to a blocked venting and exhaust flue, blocked heat exchanger, blocked combustion, or blocked inlet filter
  • Error code 100, which indicates that the blower motor has failed to vent due to a blocked venting and exhaust flue, blocked heat exchanger, blocked combustion, or failed inlet filter

How Do I Reset My Tankless Water Heater?

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

  1. An illustrated guide to resetting your Rheem water heater can be found below:

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

It is possible that you may need to push the reset button up to three times in order for the problem to be resolved. However, in the majority of circumstances, a single reset should be sufficient to restore functionality to your tank or eliminate issues. If the reset does not work, you should call a professional plumber or a water tank specialist to get it corrected. 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.

It is possible that the firm may send a technician to your home or provide a recommendation.

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

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. It will be necessary to remove the metal panel on the unit in order to have access to it. The red button may be found beneath the insulation on the wall. 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 have been closed or partially closed
  • There is no gas supply
  • Wire connections that are not secure
  • High limit switch that is not working properly, short hot water draws, and other issues.


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.

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How to Reset Tankless Water Heater – Simple Steps to Follow

Want to know how to reset your tankless water heater? Look no further. A tankless water heater heats water only when it is needed. As a contemporary device that warms water on demand, it may occasionally experience problems, but the good news is that they are simple to repair and do not require much time or effort. Because they are tankless, water is not stored and is instead heated by the heater when the tap is switched on. Whenever a user switches on a faucet, the cold water that has been traveling through the pipes gets heated up.

  1. If you have a tankless water heating device installed, you will not have to deal with this problem throughout the winter months.
  2. Water heaters using tankless technology have reduced maintenance expenses, which makes them extremely economical.
  3. The characteristics of the appliance, as well as any problem codes, are shown on this remote control.
  4. These codes are explained in detail in a manual provided by the manufacturer to the purchaser.

In this post, we’ve covered the basics of how to reset your tankless water heater, regardless of the brand of tankless water heater you own. So let’s get this party started.

Common Tankless Water Heater Issues

Here are a few of the most typical problems that might occur while using a tankless water heater:

No Hot Water Supply

In this circumstance, the water that is coming out of the faucet is still lukewarm. This is the most frequently encountered problem, and in order to resolve it, you must first determine how many appliances you are simultaneously using. If you have overloaded your unit, it may not be able to adequately heat the incoming water, resulting in the difficulty you are experiencing. So turn off all of the faucets and then switch on the system to make sure it is working properly. Often, this step is sufficient to resolve the issue.

They are clean and devoid of dirt and debris.

Electric Supply Issues

If your tankless water heater is powered by electricity, make sure that the electrical panel has not been tripped by a power surge. The power supply to the device is shut off from time to time in order to avoid any potential hazards. Overheating of the water, leaking through the pipes, and a failure in the thermostat are all issues that can result in the power supply to the system being shut off by the power company. If this is the case, you will need to reset the device in order for it to begin operating properly again.

How to Reset Tankless Water Heater?

Even though tankless water heaters are a fantastic innovation, they can occasionally experience problems with their operation and fail to heat the water as efficiently as they should. The presence of this symptom indicates that you should reset your water heater. If you are a first-time user, you may find this procedure complex; therefore, we have produced this post to help you understand the process and make it as simple as possible. Despite the fact that the procedures are straightforward, and you just need to open the tankless water heater’s exterior covering after pushing the reset button, it is important to follow them precisely.

  1. Before you begin, you must first turn off your electric water heater’s supply line so that you can access the tankless water heater’s internal components.
  2. This has the potential to have extremely negative repercussions.
  3. If the heater is linked to the electric supply through a cable, unplug the cable, or if it is directly connected to the circuit breaker, switch off the circuit breaker.
  4. Older units do not have this mechanism; instead, they are directly linked to the power source, and therefore must be unplugged by turning the circuit breaker off.
  5. Call an electrician if the breaker pops back to the off position, since this indicates that a problem exists with the circuit breaker.
  6. This metal plate is kept in place by screws, and in order to remove it, you must first loosen the screws holding it in place.
  7. This plate is typically held in place by two screws.

The type of screwdriver you require will be determined by the model of your tankless water heater.

It is then possible to remove the plate and simply access the reset button after all the screws have been removed from the device.

Some water heaters may feature a metal plate on the top that serves as a heat shield.

It will be possible to see the insulating pad when you have taken off the metal plate.

Take the insulating pad out of the bag and let it aside for a while.

If water is leaking through the water heater, then simply restarting the water heater will not solve the issue.

It’s either painted red or has the word reset printed on it.

If the button has not been pressed for a lengthy period of time, it may feel firm.

If you don’t hear a click, check to see if all of the wiring in your water heater is in good working order or needs to be replaced.

Afterwards, simply reassemble your tankless water heater by pressing the reset button for 5 seconds.

Simply insert the pad in front of the reset button to restore functionality.

Check that none of the screws are loose and that everything is properly fastened. Reconnect the tankless water heater to the outlet so that it is once again connected to an electric source, and your hot water will start flowing through the faucet within a few hours of reconnecting the device.

Why System Trips?

The water might become excessively hot at times, causing the circuit breaker to trip. This means that thethermostat is not operating properly. Because of a thermostat malfunction in either the top or lower heating element, this is happening.

When to Reset the Tankless Water Heater

The reset button on the water heater is there as a safety preventive measure. It is possible for it to trip off without any apparent reason, therefore it is safe to turn it on. If the reset button is not activated, this can occur. Because of the damage to the wiring, the power will not reach the heater and as a result, it will not turn on. If the thermostat is set to the regular setting and the water temperature rises over the set temperature, the breaker will trip. It is possible that the thermostat is not functioning properly, and the water will not be heated, resulting in the circuit being shut down.

The reset button helps to prevent damage and is simple to use; it may be reset in a matter of minutes.

Different tankless water heater manufacturers may have different resetting procedures, therefore we’ll go through the specifics of how to reset some of the most popular tankless water heaters.

Working of a Tankless Water Heater

When the water faucet is switched on, cold water is forced to flow through the system of plumbing. The water is heated by either a gas element or an electric unit. This implies that hot water will be available on demand at all times. Because there is no need to fill a tank, you may start using water right immediately; nevertheless, this has an influence on the flow rate. The majority of water warmers have a capacity of around 10 litres per minute. When there are numerous faucets running at the same time, the water heater might get overworked, resulting in water heating troubles.

The proper installation and maintenance of a water heater extends the life of the unit’s performance.

If you intend to install your equipment yourself, it is recommended that you get guidance from the manufacturer.

Maintenance performed on a monthly basis helps to increase the life of water heaters while also preventing filth from building up over time.

How to Reset Takagi Tankless Water Heater

Whenever a problem develops within a Takagi unit, the unit’s self-diagnostic units are activated and automatically check the unit. It is more convenient for the owner, and it makes it easier for the expert to diagnose and resolve the problem. An error code consisting of three numbers will show on your remote control if there is a problem.

Look for the green LED light on the computer board of your water heater if it is not connected to a remote control. This light will flash about 6 times if it is not. Some of the most prevalent error codes are as follows:

  • The error code 661 indicates a problem with the bypass valve. Check for any accumulation of limestone in the system
  • 761 The water’s temperature is greater than 104 degrees Fahrenheit

Remove the front cover of the Takagi tankless water heater in order to reset it. To use the dip buttons, press 1 and 2. Keep the buttons pressed for 5 seconds. Turn off the machine for 5 seconds before turning it back on. Before turning on the faucet, let it run for 2 minutes to ensure that the water is hot.

How to Reset Rinnai Tankless Water Heater

Rinnai provides a water heater that is both dependable and high-performing. If you have a water heating unit, it is doubtful that you would experience any problems. The troubleshooting methods below should be followed if your display panel displays an error code at any point throughout the operation. Alternatively, you might get expert assistance if necessary. In addition to being beneficial for residential applications, a Rinnai tankless water heater is also excellent for commercial applications.

  1. The majority of Rinnai parts are covered by a 5-year guarantee, allowing you to use the device recklessly for an extended period of time.
  2. They have been in the company for a long time and are well-versed in their field.
  3. Your unit will not be prone to malfunctions too often.
  4. Because various models have varying specs, it’s best to consult the instructions for the exact appliance you’re considering purchasing.
  5. Your warranty will be invalidated if you open the water heater on your own.
  6. The Rinnai display contains a large number of fault codes ranging from 02 to 79.
  7. In order to restore the item to its factory settings, locate the connect button.
  8. Now press and hold the button for a few seconds.
  9. The factory settings will reset the appliance to its factory default settings, which means that all previous settings and wireless connection history will be erased.
  10. Once the default settings have been established, you may select the new system.

How to Reset a Rheem Tankless Water Heater

Known for producing high-quality water heaters, Rheem is a dependable company. They are efficient and effective at their jobs, and they deliver the greatest service possible to the customer. Whenever a problem occurs, an error code will be shown on the display screen. In order to understand what the error code implies, you might consult the error code chart. It will inform you of the root cause of the problem as well as various solutions to the problem. It outlines the many methods of resolving typical problems that may be solved by purchasing this item, ensuring that the consumer has a positive experience.

  • The parameters of the appliance are controlled by this board.
  • Rheem water heaters are constructed with an electronic control board, resulting in a higher and more advanced technological level.
  • These features make it simple to diagnose and then resolve any problem that may arise.
  • Once you have grasped the meaning of the error code, addressing the problem will be straightforward.

If you have a breakdown in hot water delivery and are unable to identify an obvious reason, you should attempt to reset the unit. If you are having difficulty understanding the procedure, you should contact customer care for assistance. The appropriate course of action in this case is as follows:

  • Turn off the hot water faucet and the remote control
  • Turn off the lights. Now, wait for approximately 5 minutes. Start the tankless water heater by pressing the button. Start by turning on the hot water faucet and observing the outcomes

Consider trying another option if the error code is still visible and water pouring out of the faucet is not still hot after you have tried the first. Turn off the hot water faucet as well as the remote control. As a final precaution, make sure that both of them are switched off before continuing. Look for the error code guideline on the internet, which will teach you all you need to know about the problem and how to fix it. If you are unable to get any information on the code on the internet, you should contact a professional specialist for assistance.

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If you are unable to locate the code information elsewhere, contact the manufacturer using the information provided below.

  • The date on which the unit was installed
  • Model and serial number of the vehicle
  • Information about the services that have been performed to date
  • The remainder of the critical information
  • If the controller is not installed, the error code can be erased by simply turning off the power source.

How to Reset a Noritz Tankless Water Heater

When it comes to high-quality items, Noritz has always managed to amaze its customers. The energy efficiency of their appliances is unrivaled in this industry. Despite all of the work put into product quality, no product is without flaws. A tankless water heater may experience small problems every now and again, but having an error code handbook on hand will help you deal with the problems effectively. Messages from error codes alert us to issues that could otherwise go unnoticed. They alert the customer to the problem as soon as possible, so avoiding the need for expensive repairs later on.

  • If you’re not sure what your error code is, look it up online or consult the handbook for further information.
  • The error number will display on the screen if there is a problem, and you may read it and then look for information about it in order to solve the problem.
  • It is always two-digit integers, such as 10, 11, and so on, that are shown as error codes.
  • The elements of a tankless water heater are connected to an electronic board, and in order to resolve any issues, one must have sufficient understanding.
  • To reset the device, all you have to do is hit the reset button, which is conveniently located on the front panel.

How to Reset Marey Tankless Water Heater

Marey offers tankless water heaters that are unique and come with a 5-year guarantee. These water heaters are not known to malfunction frequently, but if you do experience a problem, an error code will appear on the display screen. Depending on the kind of Marey tankless water heater you have, you may have a variety of problems. Aside from the routine monthly maintenance, if you experience any problems with your Marey tankless water heater, you should call a professional to resolve the problem.

  1. When the heater is turned on, there is no clicking sound.
  2. Check the battery compartment to see if there are any problems.
  3. If the screen is not lighting up, then the electrical connections should be checked.
  4. If you are unable to resolve the problem on your own, you should contact customer support for further assistance.
  5. We hope that after reading the entire guide, you will be able to reset your tankless water heater with relative simplicity.

And if you continue to have problems with your tankless water heater, we recommend that you contact a competent plumber to assist you in getting the water heater repaired. Take a look at these more resources:

  • A description of how a tankless water heater works, as well as reviews of the best RV tankless water heaters and the best tankless water heater for a large family.

I’ve been working in the water heater and plumbing industries for several years. Providing relevant information regarding tankless water heaters is my goal, and I’m here to assist my readers in doing so. Adam’s most recent blog entries (see all)

How do you reset a tankless gas water heater?

By hitting the red button, you may quickly and conveniently reset the electric reset button. Some units come with a lower thermostat reset button on the bottom of the device. If you find yourself in this circumstance, you must also press thereset button. There are certain sections of the water heater that may be causing the problem when you hit the buttons and they do not reset immediately. Because tankless units only heat water when it is required, operating too many hot water appliances at the same time may cause the unit to become overwhelmed.

Also, how can I turn my water heater back on?

  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. Wait for the sound of the button clicking.

Now, how can I reset my Eemax tankless water heater in the following manner: 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). Remove the heater’s lid and turn it off.

What are the drawbacks of using a tankless water heating system? The most significant downside of on-demand or instantaneous hot water heaters is their high initial cost. The smaller units that you frequently encounter will not be able to provide enough hot water to meet the needs of most families. 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.

Tankless Water Heater Not Working or Heating? Here’s What to Check First.

In what ways are tankless water heaters disadvantageous? Instant hot water heaters have several disadvantages, the most significant of which being their initial cost. A majority of families will not be able to use the hot water produced by the smaller units that you frequently see on the street. 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 sink doing its work.

How many appliances am I running at once?

Most likely, if you’re running the dishwasher, doing a load of towels, and taking a shower at the same time, you’re pushing the limitations of your water heater. Select the hot water activity that you require at this time, turn off the others, then restart your unit to complete the task. Many times, this is simply due to a slew of faucets being turned on at the same time, such as your shower and the kitchen sink. For example, having a shower while also running the dishwasher at the same time might cause a tankless water heater to reach its maximum capacity quickly.

You may also install separate tankless water heaters for equipment in your house that need a lot of hot water, such as a clothes washer or dishwater.

Am I reaching my minimum flow rate?

Flow rate is defined as the quantity of water (in gallons) that must pass through the tankless unit per minute in order for it to create hot water. It is likely that the unit is shutting down as a precautionary step if you are requesting less than the minimum flow rate specified. Increase the amount of water that comes out of your faucet and wait to observe whether the water begins to heat up. Tankless water heaters must be able to detect the presence of water flow in order to begin operating properly.

This is the lowest minimum flow rate available in the industry, which is a significant advantage.

Tankless water heaters that run on natural gas have higher flow rates than those that run on electricity. Even the largest gas-fired model, on the other hand, may not be able to provide enough hot water for many simultaneous usage in a large family on occasion.

Is something plugged up?

Flow rate is defined as the quantity of water (in gallons) that must pass through the tankless unit per minute in order for it to generate hot water. It is likely that the unit may shut down as a safety precaution if you request less than the minimum flow rate. In order to test if the water warms up, increase the flow rate of your faucet. Water heaters without a tank must be able to detect the presence of flowing water in order to begin working. Even at flow rates as low as 0.5 gallons per minute, the majority of models will function well.

Tankless water heaters typically produce hot water at a rate of 2–5 gallons (7.6–15.2 liters) per minute, depending on their size.

When it comes to large families, even the most powerful gas-fired model may not be able to provide enough hot water for many simultaneous usage.

What about my power source?

If you’re using power, make sure your main electrical panel is working properly. It’s possible that anything caused the breaker to trip, necessitating a reset before your tankless water heater would function properly again. If you’re using gas, check to see that your account has been paid, that you have propane in your tank, or that your gas valve is fully in the ON position.

Is it cold outside?

If your water pipes freeze over during the winter, you may be unable to provide hot water to you or your appliances. Thaw your pipes in a safe and natural manner before attempting to get any hot water again. So what if you’re dealing with the inverse of the problem? If your water is getting too hot, these are the things you should do to cure it:

  • Stop overtaxing the system by pressing too many buttons at the same time. Set the temperature of your water heater to around 120 degrees Fahrenheit. Adjust the location of your temperature sensor in order to obtain a more accurate measurement. Inspect and clean the inlet filter on your tankless water heater. Follow the installation instructions provided by the manufacturer for your model. IMPORTANT: Whatever type of tankless water heater you have, make sure to turn it off and allow it to cool completely before performing any DIY work on it. Remove any stumbling blocks once more. A reduction in water flow might lead any heated water to become excessively hot.

A malfunctioning heater element is an issue that is exclusive to electrically powered water heaters alone. Electric water heaters can be fitted with one or two heating elements, depending on their size. If a heating element begins to ground out, it will remain on all of the time and overheat to dangerously high temperature levels. Naturally, the end consequence will be uncomfortably hot water – and that’s only to get things started! The heating element will eventually burn itself out totally over time.

  • It’s the dreaded cold water sandwich, and it’s something that happens all the time in the shower.
  • Those hot water sensations you’re experiencing at first are due to leftovers from the prior user.
  • Then, once the heater has completed its task, you will have hot water once more.
  • Using a modest storage tank to provide hot water while the tankless unit is heating up can avoid this cold water sandwich from occurring again.
  • Tankless water heaters are notorious for having this problem.
  • However, because a tankless heater requires some time to heat up the exchanger, some cold water may pass through the exchanger and reach the consumer during that period.
  • Due to the fact that gas heats up virtually instantly, but electric heaters may take a minute or two to achieve the appropriate temperature for heating, gas is the preferred fuel for space heating.

If your unit is discolored or smells nasty, it’s possible that mold, fungus, or bacteria are developing within it and causing it to malfunction.

This odor is generally generated by sulfate bacteria, which can grow in the tank over time.

The magnesium is broken down by the soft water, which results in the production of sulfate gas within the water heater.

When enough sediment accumulates, the water becomes hazy, yellow, brown, and foul-smelling.

The use of a pre-made descaling solution or normal distilled white vinegar to flush your tankless water heater should resolve your issue.

If you are aware that you have hard water issues, ask us about water softeners to assist keep your unit in peak operating condition as well.

Some DIY sources may propose draining and flushing the tank, which is not always the case.

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It is necessary to ensure that the gas pressure delivered to your tankless heater is enough.

Check any sensors, wiring fuses, and electrical components to make sure they have not been damaged or burned out completely.

It is impossible for the burner to ignite if the flow rate is too low.

The following are the ignition failure codes that have been seen on several tankless brands: Tankless Water Heater by Takagi – Error Codes 111, 11 or 3 a Rinnai electric tankless water heater has encountered an error code of 11.

The failure of an ignition system on a tankless water heater can occur with any brand and type, regardless of how complex or basic it is. An internal fault with the water heater or an external problem might both cause the failure.

  • Check to see that the gas and water are turned on, and that the power (120 VAC supply) is turned on. Check to verify that the right sort of gas (natural gas or LP) is being used. Check to ensure that the pressure is within specifications. Check to verify that all air has been sucked out of the gas line before and after the installation
  • Make certain that the plumbing is installed appropriately, in accordance with local codes and manufacturer’s instructions. Check to see if the water pressure is within specifications. Make certain that the water is not excessively hard (more than 7 grains), since this might result in sediment build-up. If you live at a higher elevation, check to see if the water heater is adjusted appropriately or according to the manufacturer’s specifications. And last but not least, is there an error code

Valves and plumbing connections that are leaking in your water heater are the most common source of water leaks. If you find a leak, try to locate the source of the leak inside the plumbing system. If the problem is not immediately apparent, it is recommended that you turn off the water to your water heater and contact a local plumber in your area to come assess the issue. Please contact us if you have tried these DIY remedies and are still having problems. We are also happy to assist you with a completely other issue.

There is no tankless water heater that our plumbers in Northwest Arkansas, Southwest Missouri, or Fort Smith cannot repair or install.

Please contact us!

3 Tankless Water Heater Problems (and How to Solve Them)

Do you have a tankless water heater that isn’t working correctly? If so, we’re here to assist. In this essay, we’ll cover the following topics:

  • Three frequent tankless water heater concerns are as follows: The nature of the problem that is causing these concerns
  • How to resolve those difficulties

Do you require skilled tankless water heater assistance? Simply get in touch with us.

1. “My tankless water heater runs hot, then cold, then hot again.”

A “cold water sandwich,” as it is known in the tankless community, is the starting point of this problem. The heat exchanger (the component responsible for heating the water) takes a long time to warm up, which results in this problem occurring. You’ll receive a short burst of cold water before it’s totally warmed up and ready to start heating the water. As soon as the heat exchanger reaches operating temperature, a constant stream of warm water is delivered. How does the initial burst of hot water arrive?

It’s true that, in most cases, there is still hot or warm water in the faucet from the appliance’s previous hot water run.

How to solve the problem:

If you experience the “hot water, cold water, hot water” surprise, speak with a specialist to determine if you should combine your tankless unit with a “small” tank water heater to avoid the problem. While the heat exchanger in your tankless water heater is warming up, you may use hot water from the small tank water heater. This eliminates the dreaded “cold water sandwich” and significantly reduces the amount of time you spend waiting for hot water.

2. “I’m not getting any hot water from my tankless water heater.”

A variety of various tankless water heater issues might result in you losing access to all of your hot water. In the first instance, regardless of whether you have a gas or an electric tankless unit, it is possible that you are pushing the device beyond its capacity. 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. It is possible that you may receive hot/lukewarm water in the shower and dishwasher while also trying to wash your hands at the same time.

  • Due to hard water, the heat exchanger has become clogged. It might be due to a clogged vent or air intake. Problems with the availability of natural gas a faulty ignitor or flame rod
  • Burners that are unclean

How to solve the problem:

Start by merely running one hot water appliance at a time to see how that works. If you are getting hot water even when only one hot water appliance is operating, see a plumber to determine whether you need to upgrade to a tankless unit with a greater flow rate.

If you have a gas tankless unit and you are experiencing no hot water when only one hot water appliance is running, conduct the following checks:

  1. You’ve paid your gas bill (since your tankless water heater cannot heat water unless there is a consistent supply of gas! )
  2. If your water heater vent is not clogged (be careful—these are typically placed on the roof), check the following: This means that the gas valve that supplies your tankless unit is turned on, not off. You’ve decided to schedule regular maintenance. Other tankless issues will be caught or prevented if you have frequent maintenance performed. In addition, your plumber may propose that you install a water softener to counteract hard water.

Still haven’t gotten any hot water? Have an expert check the device to determine the source of the problem and provide a solution.

3. “My tankless water heater shuts off during showers.”

This is most certainly the case if you have an older tankless water heater (10 years or older). The problem is most likely caused by the minimum flow rate being set too high. Per tankless water heater has a minimum “flow rate,” which is defined as the quantity of water, measured in gallons, that the tankless unit need to flow through it every minute (gpm) in order to create hot water. If the amount of hot water you’re requesting is less than the minimum flow rate for your unit, it’s likely that your unit is shutting down automatically as a safety measure.

As a result, in order to prevent damage to the heat exchanger (as well as scorching you with extremely hot water), your tankless unit will automatically shut down, leaving you with cold water in the middle of your shower.

How to solve the problem:

If this is a recurring problem, see a plumber to determine whether you should upgrade your unit. Most older water heaters have a minimum flow rate of 1/2 to 3/4 gpm at their lowest setting. Newer units, on the other hand, have extremely low minimum flow rates (as low as 14 gpm), which means that your unit will continue to operate even when there is just a tiny demand for hot water.

Need professional tankless water heater repair in Phoenix?

Simply get in touch with us. We provide plumbing repairs 24 hours a day, seven days a week by qualified, environmentally conscious plumbers you can trust.

6 Common Tankless Water Heater Problems and How to Solve Them

Tankless water heaters are a terrific investment for your home or workplace since they are energy efficient. Because they heat water just when it is needed, they are not only incredibly efficient, but they may also save you money. Despite the fact that it is rare, problems might develop if anything in your water heater is not functioning properly. Tankless water heaters are susceptible to a number of difficulties and maintenance issues, which are listed below:

  • Mineral buildup, system overload, cold water sandwich, air supply or exhaust blockage, ignition failure, and flame failure are all possible causes of failure.

Continue reading to understand what indications to look for when recognizing these difficulties, as well as how to resolve them!

Problem 1: Mineral Buildup

No matter whether you have a regular water heater or a tankless water heater, you should keep an eye out for mineral accumulation inside your water heater. Unlike soft water, hard water contains a high concentration of minerals, and the harder your water, the more likely it is that mineral buildup will occur, which may be harmful to your health. It is most typically calcium and magnesium minerals that generate scaly accumulation, and if you do not solve this issue, it can have a negative impact on the performance of your water heater.

This is especially critical if you use well water.

Well water can produce a more rapid buildup of debris in your tankless water heater, making it more difficult for water to pass down the long, narrow channel to the heat exchanger, resulting in reduced efficiency.

To keep your water heater from being damaged, flush it every six months using the Eccotemp EZ-Flush System Descaler Cleaning Kit.

If you do not have access to the necessary hookups to clean your water heater, you will want a valve bypass kit to aid with the cleaning.

If your water heater becomes overloaded, it may struggle to provide the hot water you require or it may even shut down completely.

You should, however, consider upgrading to a tankless water heater with a bigger capacity, or installing a second unit, if your tankless water heater repeatedly becomes overwhelmed.

Having trouble deciding which product will make the best addition to your home?

A Cold Water Sandwich is the third problem.

When you switch on the shower, you will first feel warm water, but you will then be blasted with cold water for several seconds until the temperature gradually returns to normal.

When the second shower started, the warm water you felt at the beginning was really trapped water.

Your shower may be running chilly owing to cold water accumulating in the pipes connecting your water heater and your shower.

Unfortunately, there is no way to prevent this from happening, but now that you are aware of the issue, you may refrain from hopping in the shower until the cold water has subsided completely.

The display on the majority of tankless water heaters will display an error number to alert you that your air supply or exhaust is obstructed.

The first step is to examine all vent pipes to ensure that they are correctly connected and free of puncture holes.

Installing your water heater too close to other objects might cause an air supply to be blocked, resulting in a fire danger.

Also check any vents that are situated or lead outside your property for nests of birds, mice, or wasps.

The failure of your water heater to ignite might be caused by a variety of factors.

Additionally, if your gas or water valves are not fully opened, this might result in the ignition not working properly.

If following these methods does not address the ignition problem, it is possible that your ignition pack has failed or that there is a more serious issue.

Problem number six: flame failure.

Just like with ignition failure, you should first rule out simple problems such as a low propane tank or an unpaid gas payment before moving on to more complicated issues.

Contact technical support if you need assistance with troubleshooting the issue any more thoroughly.

Despite the fact that tankless water heaters are typically low-maintenance and highly efficient, issues can occasionally arise.

It does, however, include some of the most typical issues that people have.

We encourage you to contact ourhelp desk to arrange an appointment, or call us at 866-356-1992 if you don’t see the tankless water heater problem you’re experiencing listed below.

In its original form, this article was published by Robinson’s Plumbing Service and was edited by Eccotemp. To locate the ideal hot water solution for all of your requirements, use our Product Selector tool.

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