Sime
Electrical Short or Earth Leakage
Boiler trips the electrical circuit breaker or RCD when it 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
Water ingress on PCB or wiring, Shorted pump or fan motor, Damaged ignition transformer, Faulty internal wiring
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset a tripping breaker; this indicates a potentially dangerous fault.
- Isolate boiler: Turn off the fused spur and leave the breaker off until inspected.
- Visual inspection (engineer task): The engineer should look for signs of water leaks, burnt components, or damaged cables inside the boiler.
- Component isolation: The engineer will disconnect components (pump, fan, ignition, etc.) one by one to identify the faulty item causing the trip.
- Repair and test: Replace the defective component and perform insulation resistance tests before restoring normal operation.
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Repair Difficulty
Professional Required
5/5
Required Part
Circulation Pump or Fan (depending on diagnosis)
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