Senville
Outdoor Unit Non-Start
Outdoor unit does not start; indoor unit blows room-temperature air with no compressor or outdoor fan operation.
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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 or blown fuse, Loose interconnect wiring between indoor and outdoor units, Faulty outdoor PCB, Failed compressor contactor or relay on PCB
How to Fix / Troubleshooting
Safety: Turn off power at both indoor and outdoor disconnects before opening panels.
- Step 1 – Check outdoor breaker: Reset if tripped. If it trips again, stop and call a technician.
- Step 2 – Inspect interconnect wiring: Confirm that the communication/power wires between indoor and outdoor units are secure and correctly landed on matching terminals.
- Step 3 – Listen for relay click: With power restored and a call for cooling, listen at the outdoor unit for relay or contactor engagement. No sound may indicate PCB failure.
- Step 4 – Professional diagnosis: If wiring and breakers are fine, the outdoor PCB or compressor may be faulty and should be tested by a professional.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control Board (PCB)
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