P9 - 4 red flashes, 1 green flash — TH5 condenser/evaporator thermistor open/close circuit

What does P9 mean?

This fault indicates an issue with the TH5 thermistor, which monitors the condenser or evaporator temperature. It may be disconnected or have an open/short circuit.

• TH5 thermistor disconnected from the board
• TH5 thermistor has an open circuit
• TH5 thermistor has a short circuit
• Faulty thermistor or wiring

Click steps to track your progress.

1. 1

   Ensure the TH5 thermistor is securely connected to the board.

2. 2

   Check the wiring for TH5 for any damage or loose connections.

3. 3

   Test the resistance of the TH5 thermistor.

4. 4

   Replace the TH5 thermistor if it is faulty.