Grant Electrical Short or Earth Leakage

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

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.

Possible Causes

Water ingress into electrical components, Shorted pump or fan motor, Faulty ignition transformer, Damaged wiring insulation

Safety: Do not repeatedly reset an RCD or MCB that trips when the boiler starts. Risk of electric shock or fire.

User actions:

Turn off the boiler fused spur and leave the circuit breaker off until inspected.

Engineer actions:

Insulation resistance test of pump, fan, and burner components to identify earth leakage.
Inspect for water leaks onto electrical parts and rectify the leak.
Replace any shorted components such as pump, fan, or ignition transformer.
Repair or replace damaged wiring and ensure correct earthing.

Professional Required 5/5

Ignition transformer

Check Price on Amazon

We may earn a commission from links on this page.