Error Code: PC 00 – IPM Module Protection

Error Code: PC 00 – IPM Module Protection

What this means:
This error occurs when the voltage signal sent from the IPM (Intelligent Power Module) to the compressor drive chip is abnormal. As a safety measure, the system shuts down to prevent component failure.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait 2 full minutes.

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

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

• If it remains — proceed with the steps below.

Next steps (for technicians):

1. Initial resistance test:

   • Measure resistance between U–V, U–W, and V–W at the IPM ports and P–N.

   • If any reading is 0 or close to 0 → the IPM board is defective and must be replaced.

2. Verify input voltages and wiring:

   • Confirm proper voltage between L and N, P and N, and at the bridge rectifier.

   • If abnormal, check:

     • Power supply wiring

     • Bridge rectifier condition and wiring

     • Reactor or inductance wiring and function

3. Check ventilation and fan performance:

   • Make sure the outdoor fan is running properly and the unit is ventilated.

   • If fan is not working → refer to EC 07/EC 71 fan diagnostics.

4. Confirm component connections:

   • Ensure all wiring between main PCB and IPM, and between compressor and IPM, is tight and correct.

5. Component replacement (in this order):

   • IPM module board

   • Outdoor PCB

   • Compressor (if all else fails)

What you might need:

• IPM module board

• Outdoor PCB

• Compressor

• Reactor or inductance

• Bridge rectifier

• Outdoor fan assembly

• Connection wires

Helpful tip:
Most PC 00 errors are caused by IPM board failure or wiring issues at the bridge rectifier and reactor. Start with resistance checks before replacing hardware.

Click here to view the detailed guide.TS21