E37 - Outdoor unit heat exchanger sensor (ThOR) defective

What does E37 mean?

The outdoor unit's heat exchanger sensor (ThOR) has an open circuit or a poor connection, preventing accurate temperature readings. This general error code encompasses more specific thermistor failures (E37-1 to E37-6).

• Damaged outdoor heat exchanger sensor (ThOR).
• Loose or poor connection of the sensor connector on the outdoor unit PCB.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit at the main circuit breaker.

2. 2

   Wait 30 seconds, then restore power.

3. 3

   If any sub-codes like E37-1 through E37-6 are displayed, note them down.

4. 4

   Contact a qualified service technician to inspect the sensor and its connections.