MrCool
Compressor Start Failure
Outdoor unit fan runs but compressor does not start; no cooling or heating produced.
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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
Failed compressor, Faulty outdoor inverter PCB, Open compressor winding, Internal overload open
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor disconnect. High voltage and stored energy are present.
User-level checks:
- Listen for compressor: With power on and a call for cooling, listen at the outdoor unit. A humming or clicking without compressor start suggests a problem.
Professional repair: Testing compressor windings, inverter output, and replacing the compressor or outdoor control board must be done by a licensed HVAC technician.
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Repair Difficulty
Professional Required
5/5
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