Arctic King
Compressor Hard Start / Locked Rotor
Outdoor section makes loud buzzing or humming, especially when the compressor tries to start.
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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
Weak run capacitor, Failing compressor, Low supply voltage, Faulty start relay (if equipped)
How to Fix / Troubleshooting
Safety: Unplug the unit. Capacitors can retain charge; discharge safely or have a professional handle testing.
Steps to address buzzing compressor:
- Check voltage: Ensure the outlet provides correct voltage under load. Low voltage can cause hard starting.
- Access capacitor: Remove the control box cover and locate the run capacitor (metal can with µF rating).
- Test capacitor: Use a capacitance meter to verify value. Replace if more than 10% below rating or if bulged/leaking.
- Inspect start relay: If present, test or replace the compressor start relay.
- Re-test: After replacing components, restore power and test. If the compressor still only hums and trips, it may be mechanically locked and require professional replacement.
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Repair Difficulty
Hard
4/5
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