Thermona
Electrical Short Circuit / Overcurrent
Boiler frequently trips the electrical 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 Thermona pump or fan motor, Damaged wiring harness, Water ingress on PCB, Incorrect fuse rating or wiring fault
How to Fix / Troubleshooting
Safety: Repeated tripping indicates a serious electrical fault. Do not repeatedly reset the breaker.
- Identify when trip occurs: Note whether the breaker trips immediately on power-up or only when the boiler starts a cycle (fan/pump running).
- Visual inspection: With power isolated, inspect internal wiring for signs of chafing, burning, or water damage.
- Component isolation (engineer level): A technician can disconnect the fan, pump, and other loads one by one to identify the faulty component.
- Repair/replace: Replace the defective motor, wiring, or PCB and ensure the correct fuse rating is used.
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Repair Difficulty
Professional Required
5/5
Required Part
Circulation Pump
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