8B — Compressor temperature thermistor (TH1) open/short

What does 8B mean?

This error indicates a fault with thermistor TH1, which monitors the compressor temperature. The sensor or its wiring is either open (broken circuit) or shorted (incorrect resistance).

• Damaged compressor thermistor (TH1).
• Loose or corroded thermistor connection.
• Faulty wiring leading to the thermistor.

Click steps to track your progress.

1. 1

   Turn off the main power to the outdoor unit by switching off its dedicated circuit breaker.

2. 2

   Locate thermistor TH1 on the compressor and carefully inspect its wiring connections for any looseness, corrosion, or signs of damage.

3. 3

   If visible, ensure the thermistor probe is correctly seated and making good contact against the compressor surface.

4. 4

   Power cycle the unit by turning the breaker back on after inspection.

5. 5

   This typically requires a qualified service technician to test the thermistor's resistance and replace it if faulty.