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How do you fix a Rheem tankless water heater code 11?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

If your Rheem tankless water heater is displaying error code 11, it means that the unit is not receiving enough power. This can be caused by a number of things, such as a tripped circuit breaker or a loose wire. If you suspect that the problem is with the power supply, you should call an electrician to come and take a look.

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1. Check the gas supply to the unit

  1. Turn off the power to the water heater.
  2. Inspect the gas supply to the unit for any leaks.
  3. If there are any leaks, repair them.
  4. Reattach the water heater to the gas supply.
  5. Turn on the power to the water heater.
  6. Check the gas supply to the unit for any leaks.
  7. If there are any leaks, repair them.

2. Clean or replace the unit's burner assembly

To clean or replace the unit's burner assembly in order to fix rheem tankless water heater code 11, the first step would be to remove the screws that hold the unit's top cover in place. After removing the screws, the top cover can be lifted off of the unit. Next, the burner assembly can be removed by removing the screws that are located on either side of the burner. Once the screws are removed, the burner assembly can be removed from the unit.

3. Clean or replace the unit's igniter

  1. Remove the front cover by unscrewing the four screws on the front.
  2. Remove the igniter by unscrewing the two screws on the top.
  3. Clean the igniter by using a can of compressed air and a cleaning cloth.
  4. Replace the igniter by screwing it back on to the top.
  5. Reinstall the front cover by screwing it back on to the unit.

4. Clean or replace the unit's flame sensor

To clean or replace the unit's flame sensor in order to fix rheem tankless water heater code 11:

  1. Turn off the water supply to the rheem tankless water heater.
  2. Remove the water tank.
  3. Disconnect the power connector and the water inlet connector.
  4. Clean the sensor with a damp cloth.
  5. Reattach the power connector and the water inlet connector.
  6. Reconnect the water tank.
  7. Turn on the water supply to the rheem tankless water heater.

Some users might also have success with the following opitons:

  1. Have the unit's gas line professionally inspected and, if necessary, replaced.