The indoor unit shows P1; the unit may run at reduced capacity or shut down; this is often related to voltage or phase issues.

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

Low or high supply voltage, unstable power grid, loose supply connections, incorrect wiring (for multi-phase units).

Safety: Electrical work should be performed by qualified personnel. Turn off the power before touching any terminals.

Steps:

1. Measure supply voltage: Have an electrician measure voltage at the unit terminals and compare with the nameplate rating.
2. Check for loose connections: With the power OFF, tighten all supply and ground terminals.
3. Use a stabilizer (if needed): In areas with unstable voltage, consider installing a voltage stabilizer or dedicated circuit.
4. If voltage is correct: The outdoor PCB voltage detection circuit may be faulty and require replacement.

Hard 4/5

Power Supply Circuit / Outdoor PCB

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