Miller
Electrical Overload or Short Circuit
Furnace frequently trips the household circuit breaker.
Advertisements
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.
Advertisements
Possible Causes
Shorted blower motor windings, Shorted inducer motor, Pinched line-voltage wiring, Oversized breaker or incorrect wiring
How to Fix / Troubleshooting
Safety: Repeated breaker tripping indicates a serious electrical issue. Turn off the breaker and do not repeatedly reset it without finding the cause.
- Inspect wiring: With power off, inspect line-voltage wiring inside the furnace for pinched, rubbed, or burned insulation. Repair or replace damaged wires.
- Test motors: Disconnect the blower motor and inducer motor one at a time and restore power to see if the breaker still trips. Replace any motor that causes tripping when connected.
- Check breaker size: Verify the breaker amperage matches the Miller furnace nameplate rating. An incorrect breaker should be corrected by a qualified electrician.
- Professional diagnosis: If you cannot locate the fault, contact a licensed technician to perform insulation resistance and current draw tests.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements