Danfoss
Electrical Overload / Short Circuit
Furnace frequently trips the circuit breaker or blows fuses
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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 blower motor windings, shorted inducer motor, damaged wiring harness, internal short in Danfoss control board
How to Fix / Troubleshooting
Safety first: Repeated breaker trips indicate a serious electrical fault. Do not replace a breaker with a larger size. Turn off power and leave it off until the fault is found.
Steps:
- Visual inspection: Look for burnt wires, melted insulation, or scorch marks in the control and blower compartments.
- Isolate components: A technician can disconnect motors and components one at a time to identify the faulty part. This should not be attempted without electrical training.
- Do not bypass protection: Never bypass fuses or hold breakers closed. Arrange for professional service to replace the defective motor or control board.
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Repair Difficulty
Professional Required
5/5
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