Error Code: PC 10 – Outdoor Low AC Voltage Protection

Error Code: PC 10 – Outdoor Low AC Voltage Protection

What this means:
The outdoor unit has detected that the incoming AC voltage is too low for safe operation. To prevent malfunction or hardware damage, the system shuts down automatically.

Try this first (quick reset):

1. Turn off the unit completely.

2. Wait 2 full minutes.

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

• If the error goes away — the voltage drop may have been temporary.

• If the error returns — continue with the checks below.

Next steps (for technicians):

1. Check the incoming power supply:

   • Ensure stable voltage in the expected range (typically 220–400V).

   • If voltage is low or unstable, power company or circuit may be the issue.

2. Inspect wiring connections:

   • Make sure wires are not loose, corroded, or damaged.

   • Repair or replace wires if necessary.

3. Measure voltage between P and N terminals on the PCB:

   • In standby: expect around DC 310V, 340V, or 380V (depending on model).

   • During startup: voltage should rise to operating range (220–400V AC).

4. If voltage is not within range:

   • Replace the IPM module board.

5. If IPM is working properly but issue continues:

   • Check the reactor.

   • If reactor is faulty, replace it. If reactor is fine, replace the outdoor PCB.

What you might need:

• IPM module board

• Outdoor PCB

• Reactor

• Power supply wires

Helpful tip:
Low voltage errors are common in areas with unstable electrical grids. If this error happens frequently, consider using a voltage stabilizer or consult an electrician to verify the building’s power supply.

Click here to view the detailed guide.TS10-S