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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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

2. 4

   Ensure all refrigerant stop valves are fully open.

3. 5

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