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How do you fix a Rheem tankless water heater flow sensor?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The rheem tankless water heater flow sensor is located in the water heater and is responsible for detecting the flow of water through the heater. If the flow sensor detects a problem with the water flow, it will shut off the water heater and display an error code on the control panel. The most common cause of this error code is a clogged or damaged water filter.

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1. Clean the flow sensor with a toothbrush and vinegar

  1. Turn off the water supply to the rheem tankless water heater.
  2. Unplug the rheem tankless water heater from the electrical outlet.
  3. Remove the cover on the water heater.
  4. Remove the flow sensor by unscrewing it from the water heater.
  5. Clean the flow sensor with a toothbrush and vinegar.
  6. Replace the flow sensor.
  7. Reinstall the cover on the water heater.
  8. Plug the rheem tankless water heater into the electrical outlet.

2. Replace the flow sensor

  1. Remove the cover of the rheem tankless water heater.
  2. Remove the four screws that hold the flow sensor in place.
  3. Pull the flow sensor out of the water heater.
  4. Inspect the flow sensor for damage and replace it if necessary.
  5. Reinstall the cover and screws.

3. Clean the sediment out of the tankless water heater

  1. Turn off the water supply to the tankless water heater
  2. Unplug the water heater
  3. Remove the cover and the sediment screen
  4. Remove the sediment filter
  5. Clean the sediment filter with a brush or a vacuum cleaner
  6. Replace the sediment filter

4. Replace the entire tankless water heater

  1. Turn off the power to the water heater.
  2. Remove the cover on the water heater.
  3. Remove the vent cover.
  4. Remove the brass vent tube.
  5. Remove the rheem water heater flow sensor.
  6. Clean the sensor and replace the brass vent tube.
  7. Replace the cover and vent cover.
  8. Reinstall the power supply.