F20
Miele
Heater Earth Leakage / Short Circuit
Machine trips breaker or shows F20 during heating phase
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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
Heater element shorted to earth, Damaged heater insulation, Wiring short in heater circuit, Faulty control board triac/relay
How to Fix / Troubleshooting
Safety first: If the breaker trips or you suspect a short, leave the machine unplugged until inspected. Risk of electric shock.
- Visual inspection: With power disconnected, access the heater area and look for burn marks, melted insulation, or water leaks onto wiring.
- Check for leaks: Inspect the tub seal and heater gasket for signs of water leakage that could cause tracking.
- Do not re-energize repeatedly: Repeatedly resetting a tripping breaker can be dangerous.
- Professional testing: An insulation resistance test of the heater is required. In most cases, the heater must be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Heater Element
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