Defro Electrical Overload / Short Circuit

Frequent tripping of the main fuse or circuit breaker when furnace starts

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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 fan motor, Shorted auger motor, Faulty ignition transformer, Water ingress into electrical box

How to Fix / Troubleshooting

Danger: Electrical faults can cause fire or electric shock. If you are not qualified, do not open electrical enclosures.

  • Observe when the breaker trips (on fan start, auger start, or ignition). This helps identify the faulty component.
  • Inspect the control box for signs of moisture or burnt smell.
  • Check cable insulation to motors and ignition components for damage.
  • Disconnect suspected loads one at a time (technician) and test to isolate the faulty device.

Replace any motor or transformer that shows insulation damage or low resistance to earth. This work should be done by a licensed electrician or Defro technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Combustion Fan Motor or Auger Motor (depending on diagnosis)
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