Pipe Temperature Abnormality

What does P8 mean?

This fault indicates an abnormal temperature difference between the indoor room temperature and the indoor liquid or condenser/evaporator pipe temperature. Causes include refrigerant shortages, disconnected thermistors, defective refrigerant circuits, incorrect extension pipe connections, or a closed stop valve. If unresolved, the system will operate inefficiently or fail to heat/cool, potentially leading to increased energy consumption or component wear.

1. 1

   Check liquid/condenser/evaporator pipe temperatures against room temperature using the remote controller and outdoor controller board, possibly with an A-Control Service Tool.

2. 2

   Verify extension pipe connections and indoor/outdoor unit wiring for correct orientation and integrity, especially in multi-unit installations.

3. 3

   Inspect the pipe thermistor(s) for proper connection to their holders and functionality.

4. 4

   Ensure all refrigerant stop valves are fully open.

5. 5

   Evaluate the refrigerant charge for any shortages or leaks and correct as necessary.