E1
Rheem
Indoor Temperature Sensor Failure
Thermostat displays E1 and will not control heating or cooling; may show 'Indoor sensor error'.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted internal thermistor on thermostat, Damaged indoor remote sensor (if used), Corroded or loose sensor connector on thermostat PCB, Overheated thermostat due to wall cavity heat or direct sunlight
How to Fix / Troubleshooting
Safety first: Turn off power to the HVAC system at the breaker before removing the thermostat from the wall.
Steps to troubleshoot:
- Check thermostat location: Ensure the Rheem smart thermostat is not in direct sunlight, above a heat register, or on an exterior wall with hot/cold drafts. Excessive heat can cause sensor faults.
- Inspect for remote sensor: If your model uses an optional indoor remote sensor, remove the thermostat cover and verify the sensor leads are firmly connected to the designated sensor terminals. Look for pinched or cut sensor wires.
- Visual inspection: Examine the thermostat circuit board for signs of moisture, corrosion, or burn marks around the sensor area.
- Power cycle: Reinstall the thermostat, restore power, and wait 5 minutes to see if the E1 code clears.
- If E1 remains: The internal thermistor or remote sensor is likely failed. Replacement of the thermostat or the remote sensor assembly is typically required. Contact a qualified technician or Rheem support for the correct replacement part.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Temperature Sensor (Thermostat Thermistor)
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