EHC
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 electrical components, Shorted pump or fan motor, Faulty PCB, Damaged wiring insulation
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a tripping breaker. There is a risk of electric shock or fire.
User checks:
- Turn off the boiler and leave it off. Call a qualified engineer.
- Check for visible signs of water leaks around the boiler.
Engineer checks:
- Insulation resistance test of pump, fan and other loads connected to the EHC boiler PCB.
- Inspect wiring looms for damage or chafing against sharp edges.
- Check PCB for signs of tracking or burnt components; replace if necessary.
- Rectify any water leaks before replacing electrical parts.
Only restore power once the fault has been identified and repaired.
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Repair Difficulty
Professional Required
5/5
Required Part
Circulation Pump
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