Error Code: PC 02 – Compressor Top (or IPM) Temperature Protection

Error Code: PC 02 – Compressor Top (or IPM) Temperature Protection

What this means:
The system detected that the temperature of the compressor top or IPM (Intelligent Power Module) has exceeded its safe limit. This can be caused by poor ventilation, refrigerant issues, or a sensor fault. The unit shuts down to prevent component damage.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait at least 10 minutes.

3. Turn it back on and check if the error clears.

• If the error clears — the overheating may have been temporary.

• If the error returns — proceed with the diagnostic steps below.

Next steps (for technicians):

1. Check airflow system of both indoor and outdoor units:

   • Clean the air inlet/outlet and heat exchanger.

   • Ensure fans are running properly and not blocked.

2. Check compressor top temperature:

   • If above 90°C → proceed to check refrigerant system.

   • If below 90°C → inspect wiring.

3. Check refrigerant system:

   • Look for blockages or low charge.

   • If abnormal → repair and recharge.

4. Inspect OLP (Overload Protector) sensor connection:

   • Ensure all wiring connections, especially to the OLP, are secure.

   • If loose → correct it.

5. Measure OLP sensor resistance:

   • If not zero → replace the OLP sensor.

   • If zero, but error remains → replace the outdoor PCB.

6. Check IPM mounting:

   • If screws between PCB and IPM radiator are loose → tighten and apply thermal grease.

   • If tightly secured but error persists → replace the IPM module board or outdoor PCB.

What you might need:

• IPM module board

• Outdoor PCB

• Overload protector (OLP) sensor

• Connection wires

• High pressure protector

• Thermal grease

• Refrigerant service tools

Helpful tip:
Poor airflow and loose PCB-to-IPM screws are often overlooked but common causes. Always check cooling and electrical contact before swapping out major parts.

Click here to view the detailed guide.TS32