E37-3 - Outdoor heat exchanger thermistor failure (Tho-R3)

What does E37-3 mean?

The outdoor unit's heat exchanger thermistor (Tho-R3) has failed. This thermistor is critical for measuring the temperature of the heat exchanger, impacting unit operation.

• Damaged Tho-R3 thermistor.
• Faulty wiring to the thermistor.
• Poor connection on the outdoor unit PCB.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit at the circuit breaker for 30 seconds.

2. 2

   Restore power and restart the unit.

3. 3

   If the error persists, contact a qualified service technician to inspect and replace the Tho-R3 thermistor.