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
- Turn off the water supply to the rheem tankless water heater.
- Unplug the rheem tankless water heater from the electrical outlet.
- Remove the cover on the water heater.
- Remove the flow sensor by unscrewing it from the water heater.
- Clean the flow sensor with a toothbrush and vinegar.
- Replace the flow sensor.
- Reinstall the cover on the water heater.
- Plug the rheem tankless water heater into the electrical outlet.
2. Replace the flow sensor
- Remove the cover of the rheem tankless water heater.
- Remove the four screws that hold the flow sensor in place.
- Pull the flow sensor out of the water heater.
- Inspect the flow sensor for damage and replace it if necessary.
- Reinstall the cover and screws.
3. Clean the sediment out of the tankless water heater
- Turn off the water supply to the tankless water heater
- Unplug the water heater
- Remove the cover and the sediment screen
- Remove the sediment filter
- Clean the sediment filter with a brush or a vacuum cleaner
- Replace the sediment filter
4. Replace the entire tankless water heater
- Turn off the power to the water heater.
- Remove the cover on the water heater.
- Remove the vent cover.
- Remove the brass vent tube.
- Remove the rheem water heater flow sensor.
- Clean the sensor and replace the brass vent tube.
- Replace the cover and vent cover.
- Reinstall the power supply.