Ideal Electrical Short Circuit or Earth Leakage

Boiler trips the electrical circuit breaker or RCD when attempting to start.

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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 onto the PCB or wiring, Short-circuited pump or fan motor, Damaged mains cable, Faulty PCB

How to Fix / Troubleshooting

Safety first: Repeated tripping indicates a potentially dangerous fault. Do not repeatedly reset the breaker.

User checks:

  • Visual inspection: Look for obvious signs of water leaks around the boiler. If present, turn off the water and power supply and call a qualified engineer.
  • Isolate boiler: Leave the boiler switched off at the fused spur and do not attempt any further resets.

A qualified engineer or electrician must test the insulation resistance of components, locate the short circuit, and repair or replace the faulty part.

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Repair Difficulty

Professional Required 5/5

Required Part

PCB (Printed Circuit Board)
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