Lennox
Overcurrent / Short Circuit
Lennox outdoor unit frequently trips the breaker when starting or during 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
Shorted compressor windings, Shorted condenser fan motor, Damaged wiring or contactor, Incorrect breaker size or weak breaker
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a tripping breaker. This is a fire and equipment hazard.
- 1. Inspect wiring and contactor: With power off, look for burned wires, melted insulation, or a welded contactor.
- 2. Check fan motor for shorts: A technician can test motor windings to ground with a megohmmeter.
- 3. Verify breaker size: Ensure the breaker matches the Lennox unit's nameplate MOP rating.
- 4. Compressor testing: If wiring and fan are good, the compressor may be shorted and require professional diagnosis and likely replacement.
Warning: Breaker trips indicate a serious electrical problem; leave power off and call a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Lennox Scroll Compressor
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