Rheem HVAC Error Code 29: How to Fix It

Q: Can I drive my Rheem HVAC system with error code 29?

It's not recommended. The system may shut down to prevent compressor damage. Continuing to operate it could lead to a major failure. Fix the sensor fault first.

Q: What other symptoms might accompany error code 29?

You may notice the system short cycling, not cooling or heating, or the compressor running but no temperature change. Sometimes the system will lock out and need a manual reset.

Q: How much does it cost to replace a discharge temperature sensor?

The part itself costs $10–$30. If you hire a technician, expect $150–$300 including labor and service call. DIY saves that cost.

Q: Is the discharge temperature sensor the same as a thermistor?

Yes, it's a type of thermistor (temperature-sensitive resistor). It's sometimes called a discharge line thermistor or compressor discharge sensor.

Q: Can a bad control board cause error code 29?

Yes, but it's less common. If the sensor tests good and wiring is intact, the control board may be misreading the signal. Check for burnt components on the board.

Abstract

Rheem heating and cooling systems display error code 29 when there is a fault with the discharge temperature sensor. This sensor monitors the temperature of refrigerant leaving the compressor. A fault can cause the system to shut down or run inefficiently. Follow these steps to diagnose and resolve the issue.