8D — Outdoor liquid pipe temperature thermistor (TH3) open/short

What does 8D mean?

This error indicates a fault with thermistor TH3, which measures the outdoor liquid pipe temperature. This suggests an open or short circuit in the sensor or its wiring.

• Damaged outdoor liquid pipe thermistor (TH3).
• 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 TH3 on the outdoor liquid pipe and inspect its wiring connections for any damage or looseness.

3. 3

   Ensure the thermistor probe is securely fastened to the pipe.

4. 4

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

5. 5

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