Mitsubishi Electric Electrical Overload or Short Circuit

Unit trips the circuit breaker when starting or during operation

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

Shorted compressor or fan motor, Shorted wiring, Incorrect breaker size, Faulty inverter PCB drawing excessive current

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a tripping breaker. Turn off the breaker and leave the unit off until inspected.

Steps:

Visual inspection: With power OFF, inspect indoor and outdoor wiring for obvious shorts, burnt insulation, or loose connections.
Check breaker rating: Confirm the breaker size matches the unit’s nameplate requirements.
Isolate components (technician): A technician can disconnect compressor or fan circuits to isolate the faulty component.
Replace faulty parts: Replace any shorted motors, compressors, or PCBs as identified by testing.

Repair Difficulty

Professional Required 5/5

Required Part

Compressor / Fan Motor / Inverter PCB

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