How to reset a tankless water heater: An easy guide to Fix

Troubleshooting: The Ultimate Guide on how to Reset Your Tankless Water Heater in No Time and Get Your Hot Water Flowing Again

Are you experiencing issues with your tankless water heater? Don’t worry! Resetting it is a simple process that can be done in just a few steps. Whether you’re getting error codes or the unit just isn’t turning on, resetting your tankless water heater can often be the solution. In this article, we’ll walk you through the step-by-step process of resetting your tankless water heater, so you can say goodbye to cold showers to enjoying hot showers in no time!

Resetting a tankless water heater is a simple process that can be done in a few steps given below.

Steps to reset a Tankless water heater

1.Turn Off the Power (for some units)

Turning off a tankless water heater is an important step in performing maintenance or troubleshooting issues with the unit. It is also important, to turn off the water heater before performing any repairs or attempting to reset the unit. Here is a step-by-step guide on how to turn off a tankless water heater:

Step 1: Locate the power button. The first step in turning off a tankless water heater is to locate the power button on the dashboard or panel of the heater. This may be a circuit breaker or a button that controls the power to the heating unit. Some heaters have a power button on the side or inside the panel. So, check the user manual for the power button location if you can’t find it directly.

turn off the circuit breaker for tankless water heaters

Step 2: Turn off the power once you have located the power source, turn off the power to the water heater by either flipping the circuit breaker to the “off” position or removing the fuse. This will disconnect the power supply to the unit, effectively turning it off.

Step 3: Turn off the gas supply (if applicable) If your tankless water heater is powered by gas, it is also important to turn off the gas supply to the unit. This can usually be done by turning the gas valve on the unit to the “off” position or by closing the shut-off valve on the gas line leading to the unit.

Step 4: Verify that the unit is off After turning off the power and gas supply (if applicable), verify that the unit is off by checking that the display or indicator lights on the control panel are not lit and there is no hot water coming out of the faucet.

Note: turning off the power or gas supply to the unit will not stop the flow of hot water immediately. It will take some time for the hot water in the unit to cool down.

2. Locate the reset button

The location of the reset button on a tankless water heater can vary depending on the make and model of the unit. However, in most cases, the reset button can be found on the control panel of the unit. It is typically a small red button that may be labeled “reset” or “power.”

look for the reset button near thermistors on tankless heaters

Some newer models of tankless water heaters may have a digital control panel with a display screen, in which case the reset button may be located on the screen and activated by pressing a button labeled “reset” on the control panel.

In some of the water heaters, reset button is inside the heater. So, remove the upper panel carefully and search for the reset button, in most cases it is near the thermostats or heating elements where circuitary is placed.

It is important to refer to the manufacturer’s instructions or consult a professional if you are unsure about the location of the reset button on your specific model of water heater.

3. Press the reset button and wait till it restarts

Once the reset button has been located, press it firmly. This will cause the water heater to reset itself and begin the process of restarting. After the reset button has been pressed, the water heater will begin to restart. This process can take a few minutes, so it is important to be patient and wait for the unit to fully restart. If if doesnt turn on automatically, turn the power manually.

Some new model heaters has different type of reset buttons.  for example in Rheem tankless water heaters we have to press multiple buttons in order to reset the heater. It has 2 sets of DIP switches and 3 push buttons. To reset, first turn up the 2nd switch in the top DIP and turn the switch to down then with in 5 seconds press and hold min and max push buttons same time till you see the UL on the display. Wait for few seconds and turn on the power. That’s it the reset is done.

4. Check for any error codes

Once the water heater has restarted, it is important to check for any error codes that may have been displayed. These codes can indicate a problem with the unit, and should be addressed before using the water heater again.

look for error codes on display of tankless water heater

Error codes may consist of a combination of letters or numbers, or may be indicated by flashing lights on the control panel. If an error code is displayed, it is important to record the code and any accompanying information provided by the manufacturer. This information can be used to troubleshoot the issue and determine the cause of the problem.

Some tankless water heaters may not have error code display, in that case you should consult the manufacturer’s instructions for troubleshooting or contact a professional for assistance.

5.Turn on the power supply

Once the water heater has restarted and no error codes are present, it is safe to turn on the power supply to the unit.

6.Test the water heater

Finally, test the water heater to ensure that it is working properly. Turn on a hot water faucet and let the water run for a minute or two. This will help to flush out any air that may be in the lines and will also allow you to check the temperature of the water to make sure that it is hot enough.

By following these steps, you should be able to reset your tankless water heater and get it back up and running. However, if you are still experiencing problems with the unit or unsure of how to proceed, it is best to consult a professional for assistance.

Also Read: Tankless Water Heater Expansion Tank: A Must-Read Guide Before You Buy

Reasons why you need to reset a Tankless water heater

There are several reasons why you may need to reset a tankless water heater:

  • To clear Error codes
  • If the heater is Overheating
  • After a Power Outage if the heater does not turn on
  • If any water flow problems, clean the pipes and elements and reset the heater.

In addition to the issues previously mentioned, there may be other issues which requires a “RESET” for your heater. If you faced any problem which is not listed above please post it in the below comment section.

To avoid getting error codes and issues, we advice you to perform a service maintenance for your tankless water heater regularly by cleaning and descaling the internal parts.

If you have any questions or concerns, don’t hesitate to leave a comment below! Our team is here to assist you and provide all the information you need. Your feedback is important to us, so please feel free to share your thoughts and we’ll respond as soon as possible.

TanklessHelp Staff

TanklessHelp Staff has an experienced writers and researchers in the field of water heating technology. With a background in HVAC and plumbing, Tanklesshelp staff has in-depth knowledge in many types of waterheaters in America and Canada. They have a passion for educating homeowners and businesses on solving easy to hard repairs and guide them on how to maintain them to save money.

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One Comment

  1. Hi,
    I have an eco-smart water heater tankless from yesterday we are not getting hot water, there is no reset button on it. can you guys please help with it? The heater model is: Eco 24

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