Buderus
Earth Leakage / Ground Fault
Water heater occasionally trips the building's residual current device (RCD) or ground fault interrupter.
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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
Moisture on electrical components, Failing pump or fan motor with insulation breakdown, Damaged power cable, Faulty control board
How to Fix / Troubleshooting
Safety: Do not repeatedly reset the RCD without finding the cause. Turn off power and isolate the heater.
- Inspect for moisture: Look for leaks or condensation near electrical components. Repair leaks and dry components thoroughly.
- Check cable and plug: Inspect the power cable for cuts or crushed sections. Replace if damaged.
- Isolate components: A technician can disconnect motors and other loads one by one to identify which component causes the trip.
- Replace faulty component: Replace any motor or board that shows insulation breakdown or leakage to ground.
- Test RCD: After repairs, test the RCD function and monitor for further trips.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump / Combustion Fan / Control Board / Power Cable
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