Mitsubishi Electric
Outdoor Unit Not Operating
Indoor unit powers on but compressor and outdoor fan do not start; only indoor fan runs
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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.
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Possible Causes
No power to outdoor unit, Faulty outdoor PCB, Communication failure between indoor and outdoor, Tripped outdoor overload or protector
How to Fix / Troubleshooting
Safety first: Turn off power at both indoor and outdoor disconnects before inspection.
Steps:
- Check outdoor breaker: Ensure the outdoor unit’s breaker or disconnect is ON.
- Listen for outdoor operation: When the indoor unit calls for cooling, listen outside for compressor or fan noise. Silence suggests no outdoor operation.
- Inspect wiring: Confirm that the interconnecting cable is properly connected at both indoor and outdoor terminals and shows no visible damage.
- Technician diagnostics: If power and wiring appear normal, a technician should check outdoor PCB status LEDs, compressor and fan operation, and system pressures.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Control PCB
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