P2 / PC 02 - Error Code Diagnostic

Issue: High-temperature protection of the compressor, IPM module, or high-pressure protection.

Initial Diagnosis:

1. Check if the IPM module temperature exceeds a certain threshold.
2. For models with a high-pressure switch, confirm if system pressure exceeds 4.4 MPa.

Troubleshooting Steps:

1. Check airflow:
   Ensure that the indoor and outdoor units' airflow systems are not obstructed.

   • If obstructed: Clear any blockages from the air inlet, outlet, or heat exchanger.

2. Power cycle the unit:
   Turn off the power supply and wait 10 minutes before restarting.

   • If the unit doesn’t start: Inspect all connections, especially the Overload Protector (OLP) sensor.
     • If connections are loose: Correct them.
     • If connections are intact: Measure the resistance across the OLP terminals.
       • If resistance is not zero: Replace the OLP.
       • If resistance is zero: Replace the outdoor control PCB.

3. Check refrigerant level:
   Ensure the refrigerant charge is correct.

   • If not: Recharge to the correct volume.

4. Inspect screws:
   Check that the fastening screws on the PCB and IPM module are tightly secured.

   • If not: Tighten them.

5. Examine the radiator:
   Verify if the radiator is dirty or blocked.

   • If yes: Clean the radiator.

6. Check high-pressure protection:
   Ensure the high-pressure switch and main control board are properly connected.

   • If not: Reconnect them.
   • If the high-pressure switch is faulty:
     • Test its resistance. If it's not zero, replace the switch or high-pressure protector.

7. Outdoor temperature check:
   Confirm if the outdoor temperature exceeds 50°C.

   • If yes: Stop the unit.

8. Verify outdoor ventilation:
   Ensure proper ventilation of the outdoor unit.

   • If not: Correct the ventilation.

9. Inspect the outdoor fan:
   Check for abnormal fan operation.

   • If yes: Follow the solution for outdoor fan error (F5 / EC 07).

10. Check the heat exchanger:
    Ensure it is clean.

    • If dirty: Clean it.

11. Refrigerant circulation check:
    Verify that the refrigerant system is functioning properly.

    • If there’s a blockage: Investigate and resolve the issue.

To order a replacement part or to get further assistance in diagnosing your unit, please contact one of our support representatives by submitting a ticket using the link below.

Submit a Ticket

*Please note these procedures must be performed by a certified HVAC contractor.