Royal Clima Inverter Module Protection / DC Bus Voltage Error

Indoor unit shows P0, compressor may not start or runs at very low capacity.

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

Abnormal DC bus voltage on outdoor PCB, Faulty rectifier or PFC circuit, Loose power connections, Defective inverter module

Safety first: High DC voltages are present in inverter circuits. Do not touch components with power applied.

Step 1 – Check power terminals: With power OFF, tighten all power input terminals and inspect for discoloration.
Step 2 – Power reset: Turn OFF the breaker for 10–15 minutes, then restore power and test.

When to call a technician: P0 generally requires board-level diagnosis and should be handled by a qualified technician.

Professional Required 5/5

Outdoor Inverter PCB

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