P0 code; unit may limit capacity or shut down

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Supply voltage too high or too low, Loose mains connections, Faulty PFC (power factor correction) circuit on PCB, Oversized generator or unstable power source

How to Fix / Troubleshooting

Safety first: Turn off power before checking terminals.

Check mains voltage: Have a qualified electrician measure voltage at the unit. Compare with SMEG nameplate rating.
Tighten terminals: Ensure all L/N/E screws are tight in the indoor and outdoor units.
Avoid unstable power: Do not run the unit on undersized or poor-quality generators.
Power cycle: After correcting supply issues, power off for 5 minutes and restart.

If P0 persists with correct voltage, the inverter PCB may require replacement.

Repair Difficulty

Hard 4/5

Required Part

Outdoor Power Supply / Inverter PCB

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