Error Code: PC 00 – Outdoor IPM Module Protection

Error Code: PC 00 – Outdoor IPM Module Protection
Applies to LETO and AURA Series

What this means:
The outdoor unit’s IPM (Intelligent Power Module) has detected an abnormal voltage signal going to the compressor. As a safety precaution, the system shuts down to prevent further damage.

Try this first (easy fix):

1. Turn off power to the system completely.

2. Wait 2 full minutes.

3. Turn it back on and check if the error has cleared.

• If the error is gone — the issue may have been temporary.

• If it returns — proceed with the steps below.

Next steps (for technicians):

1. Check wiring between the PCB and compressor.

   • If wiring is loose or damaged, correct or replace it.

2. Check IPM terminal resistance:

   • If resistance is uneven, replace the IPM board or the outdoor PCB.

3. Check outdoor fan and ventilation:

   • If the fan isn’t working or the unit is poorly ventilated, correct the issue.

   • If necessary, refer to “Fan speed out of range” troubleshooting.

4. Check compressor resistance:

   • If resistance readings are off, replace the compressor.

5. Check IPM installation:

   • Ensure the module is properly installed, screws are tightened, and thermal grease is applied.

What you might need:

• IPM module board

• Outdoor PCB

• Outdoor fan assembly

• Compressor

• Connection wires

Helpful tip:
This error may appear intermittently at first but can lead to full shutdown if left unresolved. Always verify IPM board health and compressor resistance before replacing parts.

Click here to view the detailed guide.TS09-S