LCD shows P9 - Abnormality of pipe temperature thermistor/Condenser-Evaporator

What does P9 mean?

The remote controller LCD displays 'P9', indicating an abnormality with the pipe temperature thermistor related to the condenser or evaporator.

• Pipe temperature thermistor (TH5) malfunction.
• Loose or disconnected thermistor wiring.
• Improper placement of the thermistor.

Click steps to track your progress.

1. 1

   Check if the pipe temperature thermistor (TH5) is securely attached and its wiring is intact.

2. 2

   Inspect the connections of the thermistor to the indoor unit's control board.

3. 3

   If accessible, measure the resistance of the thermistor to verify its functionality (consult service manual for values).