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How do you fix the Rheem tankless water heater error code 13?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

Rheem tankless water heater error code 13 is a problem with the water heater's gas valve. This error code means that the gas valve is not opening properly. This can be caused by a number of things, including a clogged gas line, a faulty gas valve, or a problem with the electrical connection to the gas valve. If you see this error code, you should call a qualified technician to come and take a look at your water heater.

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  • rheem tankless hot water heater error code 13
  • rheem tankless water heater error code 13

1. Check the gas supply to the unit

  1. Verify that there is a gas supply to the unit
  2. Inspect the gas line to the unit for any obstructions
  3. Check the gas pressure at the unit
  4. Check the gas flow rate at the unit
  5. Inspect the unit's gas valve for any malfunctions

2. Clean or replace the unit's gas valve

  1. Turn off the power to the rheem tankless water heater.
  2. Remove the cover plate on the gas valve.
  3. Clean any debris that may be present on the valve.
  4. Replace the gas valve if necessary.

3. Clean or replace the unit's flame sensor

  1. Shut off the power to the unit.
  2. Remove the cover on the unit.
  3. Locate the flame sensor.
  4. Remove the flame sensor.
  5. Clean the sensor with a clean cloth.
  6. Apply a thin layer of thermal compound to the sensor.
  7. Replace the flame sensor.
  8. Reconnect the power to the unit.

4. Clean or replace the unit's igniter

  1. Remove the unit from the wall.
  2. Remove the cover plate.
  3. Remove the igniter.
  4. Clean the igniter with a cloth or a vacuum cleaner.
  5. Install the igniter.
  6. Reinstall the cover plate.

Some users might also have success with the following opitons:

  1. Have the unit serviced by a qualified technician.