Rheem Tankless Water Heater Code E5 [4 Easy Solutions]

You may be annoyed with your Rheem tankless water heater code e5 problem. To remove your annoyance, we have come up with 4 reasons and solutions to this problem. The reasons are high water flow rate, bad combustion alarm, pilot or main burner valve problem, and the motor problem.

We are declaring that this article will help you to solve your Rheem water heater code E5 problem very effectively and easily. Therefore, let’s begin the main discussion.

Rheem Tankless Water Heater Code E5 [4 Easy Solutions]

Sometimes, the Rheem electric tankless water heater code e5 problem won’t cause your Rheem tankless water heater not to work. Other times your Rheem tankless water heater won’t work too. Whether your Rheem tankless water heater is working or not, this problem will annoy you. 

That is where we come in. The 4 reasons and solutions to this problem discussed in the below guide will help you to solve this problem effectively. 

Note: You can also read how to fix Rheem water heater 6 3 flashes.

1. High Water Flow Rate

This is the most common reason for your Rheem tankless water heater’s LED control board to show an E5 error code. It happens if the expected volume of water is very high to reach your preferred preset temperature. In this case, your Rheem tankless water heater might work.

Solution:
To solve this, you need to reduce the water flow. For reducing the water flow, you can turn the water supply valve to close.

2. Bad Combustion Alarm

If there is a problem with the combustion, then your Rheem tankless water heater can show an error code E5. It can be caused by a block in the exhaust vent or a problem with the air intake. This problem can also be caused by a blockage in the air supply pipe, and connection or termination is loose or not properly done. 

The alarm sounds in 60 seconds each while the tap is open. In maximum circumstances, when you notice this problem, the unit will still be working.

Solution:

Firstly, check and eliminate everything that might be blocking the exhaust vent. Then, you need to check that the vent pipes on the vent termination are linked. Next, carefully check that the venting meets the necessities like the venting material, proper diameter, vent lengths, and so on. 

Now, check that the venting is correctly sealed and that there are no obstacles. You might need to contact an expert to make sure that your venting is right and in good working condition. If you do not find a problem with the venting, then you need to check the blower motor. 

You need to also take away and clean the air inlet filter. In addition, remember to clean the combustion air fan and the heat exchanger fans. Finally, check that the fan motor is functional and in good working order.

3. Pilot Or Main Burner Valve Problem

Sometimes, the pilot or main burner valve of your Rheem tankless water heater can fail to open. As a result, your Rheem tankless water heater will show the E5 error code.

Solution:

To solve this, you need to recycle the water heater to confirm the error code. Also, you need to change the gas control valve to solve this problem.

4. The Motor Problem

If there is a motor problem in the water heater or the voltage of the power supply is very low, then your Rheem tankless water heater can show the E5 error code.

Solution:

In this case, if you are convinced that the power source is within the needed amount and the same problem continues, you need to reset your Rheem tankless water heater. To reset it, firstly, totally drain the unit out of water. 

Then, you need to turn off the gas valve. After that, you need to leave it unplugged for five minutes from the power outlet. Finally, restart the water heater to solve the problem.

FAQ:

What Does E5 Mean On Rheem Tankless Water Heater?

Mainly E5 on a Rheem tankless water heater means a high water flow rate. It can also mean a bad combustion alarm, a motor problem in the water heater or the voltage of the power supply is very low, and a pilot or main burner valve problem.

How Do You Fix Code 11 On A Rheem Tankless Water Heater?

Error code 11 means that the ignition has failed, inadequate gas, a faulty sensor, or dusty combustion parts. You need to clean the combustion parts and make sure that the ignitor is functional. Still, if the problem is not solved, call for professional help.

What Does E4 Mean On A Rheem Tankless Water Heater?

An E4 error code signifies that you have a problem with the water temperature sensor of your Rheem tankless water heater. It is the sensor that lets the Rheem tankless water heater show the present temperature of the water inside of it. Generally, when the E4 error code is shown, your Rheem tankless water heater won’t work.

What Is Code 13 On A Rheem Tankless Water Heater?

The error code 13 on a Rheem tankless water heater means poor or inappropriate combustion. This error code will only show on indoor Rheem tankless water heater systems. It will cause the air intake and exhaust vent of your Rheem tankless water heater to not function well. The error code 13 can also cause the exhaust vent to recirculate into the unit’s fresh air intake.

Do Tankless Water Heaters Have A Reset Button?

A red button is situated on the upper thermostat of the tankless water heater, which is the reset button of it. There are 2 reset buttons for every thermostat in a few tankless water heaters. You might need to remove a small metal panel that holds the thermostat in place to reach the reset button.

Conclusion

Your peace of mind can disappear quite rapidly if you can see the Rheem electric tankless hot water heater error code e5 and you do not know how to fix it. In this article, we have collated the most common 4 reasons and solutions of the Rheem tankless water heater code e5 problem. 

As a result, you do not need to waste several hours searching on the internet to find the solution. Just go through this whole article and solve this problem very easily. Still, if the error code E5 problem is not solved, then let us know in the comment box. We will try our best to solve the problem ASAP.

2 thoughts on “Rheem Tankless Water Heater Code E5 [4 Easy Solutions]”

  1. Tried the reset, even shut down main power for ten minutes. Code E5 is still showing. I also have a problem with the hot water going cold after running for about three minutes. Cold shower not my idea of fun. Unit is about two years old Rheem-36. RTEX-36.

    Reply
    • Hi Scott

      Mainly E5 on a Rheem tankless water heater means a high water flow rate. It can also mean a bad combustion alarm, a high water flow rate, a motor problem in the water heater or the voltage of the power supply is very low, and a pilot or main burner valve problem. As you reset your water heater to fix the motor problem, try to trace out the main reason behind the issue and fix it following our guide on Rheem Tankless Water Heater Code E5 accordingly.

      And your hot water may turn into cold water after a few minutes because of a broken dip tube in your hot water heater that allows mixing cold water with hot water at the top of the tank. As a result, you get cold or lukewarm water.

      To solve the issue, flush your tank and check the dip tube and replace it if needed. It would be wise to take help from a professional to do the work.

      Hope you will get the solution.

      Thanks.

      Reply

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