Viessmann
Electrical Short or Earth Leakage
Water heater trips the household 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 PCB or wiring, Shorted pump or fan motor, Damaged heating circuit insulation, Incorrect wiring polarity or grounding
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a tripping breaker. Risk of fire or electric shock.
- Inspect for moisture: With power off, open the casing and look for signs of leaks or condensation on electrical parts. Fix leaks before drying components.
- Isolate components: A technician can disconnect the pump, fan, and other loads one by one to identify the faulty component.
- Check wiring: Ensure no wires are pinched or contacting sharp metal edges.
- Professional testing: Insulation resistance and earth leakage tests should be performed by a qualified electrician or technician before returning the unit to service.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Fan Assembly
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