Sharp
Outdoor Unit Not Starting
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
Tripped outdoor breaker, Faulty outdoor contactor or relay (non-inverter models), Communication failure between indoor and outdoor, Failed outdoor PCB
How to Fix / Troubleshooting
Safety first: Turn off all related breakers before opening the outdoor unit.
- Check outdoor power: Verify that the outdoor unit has its breaker on and that voltage is present at its terminals.
- Listen for relay click: When cooling is requested, you should hear relays or contactors engage in the outdoor unit. If not, the control signal may not be reaching it.
- Inspect wiring: Confirm that the interconnecting cable between indoor and outdoor units is correctly wired and secure.
- Professional service: If power and wiring are correct but the outdoor unit remains inactive, the outdoor PCB or compressor start components may be faulty and require a technician to diagnose and replace.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control PCB
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