Error Code: PC 01 – Outdoor Voltage Protection

Error Code: PC 01 – Outdoor Voltage Protection
Applies to LETO and AURA Series

What this means:
The outdoor unit has detected abnormal voltage — either too high or too low. This can damage key components like the compressor and IPM, so the system automatically shuts down as protection.

Try this first (easy check):

1. Turn off the unit completely.

2. Wait 2 full minutes.

3. Turn the unit back on and check the display.

• If the error clears — it may have been a temporary power issue.

• If it returns — continue with the steps below.

Next steps (for technicians):

1. Check the power supply:

   • Confirm voltage input is stable and within acceptable range (typically 220–400V AC).

2. Check all electrical connections and wiring:

   • If wires are damaged or loose, correct or replace them.

3. Measure the voltage between P and N terminals:

   • In standby, should read DC ~310V, 340V, or 380V depending on model.

   • During startup, should remain within rated voltage.

4. If voltage is not stable:

   • Replace the IPM board.

5. If voltage is stable but error persists:

   • Check the reactor.

     • If faulty, replace it.

     • If functional, replace the outdoor PCB.

What you might need:

• IPM module board

• Outdoor PCB

• Reactor

• Power supply wires

Helpful tip:
This error often appears after power fluctuations or if the unit is installed in an area with unstable voltage. Always verify line voltage before replacing any internal parts.

Click here to view the detailed guide.TS10-S