Biasi
Electrical Short / Earth Leakage
Boiler frequently trips the household RCD or MCB when attempting to start.
Advertisements
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.
Advertisements
Possible Causes
Water ingress onto electrical components, Shorted pump or fan motor, Damaged wiring harness, Faulty PCB causing earth leakage
How to Fix / Troubleshooting
Safety: Do not repeatedly reset an RCD that trips when the boiler runs; this indicates a potentially dangerous fault.
- Visual inspection: With power off, remove the boiler case and look for signs of water leaks onto the PCB, pump, or wiring.
- Dry any moisture: If minor condensation is present, dry carefully and address the source of moisture (e.g., leaking pipe or flue).
- Isolate boiler: Leave the boiler switched off and contact a qualified engineer.
- Engineer testing: A technician will perform insulation resistance tests on the pump, fan, and wiring, and replace any faulty components or PCB.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Wiring Harness
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements