Fraser-Johnston
Overcurrent / Short Circuit Condition
Breaker trips when air conditioner starts or shortly after
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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
Shorted compressor, Shorted condenser fan motor, Shorted wiring to ground, Oversized or weak breaker
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a tripping breaker. Risk of fire or equipment damage.
- Visual inspection: With power off, inspect wiring in both indoor and outdoor units for burnt insulation or contact with sharp metal edges.
- Isolate loads: A technician can disconnect compressor and fan leads to test each component individually for shorts to ground.
- Check breaker size: Confirm breaker size matches Fraser‑Johnston unit nameplate MCA/MOP ratings.
- Replace failed components: Replace any motor or compressor found shorted, or replace the entire condenser if compressor is failed.
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Repair Difficulty
Professional Required
5/5
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