Error Code: PC 01 – Outdoor Voltage Protection

Error Code: PC 01 – Outdoor Voltage Protection

What this means:
The outdoor unit has detected an abnormal voltage — either too high or too low — through its voltage detection circuit. To prevent damage, the system stops operating until the issue is resolved.

Try this first (quick reset):

1. Turn off the power to the unit.

2. Wait 2 minutes.

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

• If the error clears — the voltage may have stabilized.

• If it returns — begin the voltage and component checks below.

Next steps (for technicians):

1. Check the power supply:

   • Is voltage within normal operating range?

   • If not → shut off unit and repair the power source.

2. Inspect power cables and connections:

   • If wires are damaged or loose → repair or replace.

3. Measure voltage between P and N terminals:

   • In standby, DC voltage should be approximately 310V, 340V, or 380V.

   • During startup, AC voltage should range between 220V–400V.

   • If not → replace the IPM module board.

4. Check the reactor (inductance coil):

   • If faulty → replace the reactor.

   • If reactor is normal but issue persists → replace the outdoor PCB.

What you might need:

• Power supply wires

• IPM module board

• Reactor

• Outdoor PCB

Helpful tip:
This error is common when power supply is unstable or undersized. Before replacing components, always test and confirm both AC input and DC output voltages.

Click here to view the detailed guide.TS27