Error Code: PC 30 – System High Pressure Protection

Error Code: PC 30 – System High Pressure Protection

What this means:
The system has shut down because the outdoor pressure switch detected a high pressure above 4.4 MPa. This protection prevents compressor damage due to overheating or blockage in the refrigerant loopTS34.

Try this first (quick reset):

1. Power off the system.

2. Wait 2 minutes.

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

• If the error clears — pressure has stabilized.

• If not — begin troubleshooting the high pressure side.

Next steps (for technicians):

1. Check wiring between high pressure switch and main PCB:

   • If not connected correctly → reconnect the wires securely.

2. Measure resistance of the high pressure protector:

   • Disconnect the plug.

   • If resistance ≠ 0 → replace the high pressure protector.

   • If resistance = 0 → continue.

3. Check outdoor ambient temperature:

   • If temperature is over 50°C → allow the unit to cool down.

4. Check ventilation around outdoor unit:

   • Ensure air inlets/outlets are not blocked.

5. Inspect heat exchanger:

   • If dirty → clean the outdoor coil.

6. Check outdoor fan operation:

   • If not spinning properly → repair or replace the outdoor fan.

7. Verify refrigerant system functionality:

   • If pressure remains abnormal despite fixes → replace the outdoor main PCB.

What you might need:

• High pressure protector

• Connection wires

• Outdoor fan

• Outdoor main PCB

• Cleaning tools

Helpful tip:
Most PC 30 errors are caused by airflow restriction or dirty coils, not component failure. Always clean and test before replacing expensive parts.

Click here to view the detailed guide.TS34