V-ZUG Insulation Fault or Short Circuit in Heating System

Oven trips the household circuit breaker or RCD (residual current device) when heating 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

Moisture in heating elements, Shorted heating element to chassis, Damaged mains cable or terminal block, Faulty filter or suppression capacitor

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a breaker that trips immediately. Disconnect the oven from power and investigate.

Step-by-step checks:

  • Visual inspection: Check the mains cable, terminal block, and rear of the oven for burnt or damaged insulation.
  • Insulation test (by qualified person): Use a megohmmeter to test insulation resistance between each heater terminal and earth. Low resistance indicates a leaking element that must be replaced.
  • Drying: If the oven has been unused for a long time or exposed to moisture, gentle heating at low temperature (under supervision and only if it does not trip) can sometimes dry out elements.

When to call a technician: Electrical safety testing and replacement of faulty elements or filters should be done by an authorized technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Heating Elements / Mains Filter / Wiring
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