Washer shows E12; often related to heating or scaling issues

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.

Possible Causes

Heater coated with heavy limescale, Restricted water circulation around heater, Faulty NTC sensor, Low water level during heating

Safety first: Disconnect power and allow the machine to cool.

Run descaling cycle: Run an empty 90°C cycle with a Bosch-approved descaler or citric-acid-based cleaner to remove limescale from the heater and tub.
Check water level: Ensure the machine fills to the correct level; low level can cause overheating. If not, inspect the pressure switch and inlet valve.
Inspect heater and NTC: Access the heater, check for heavy scale buildup, and test the NTC sensor resistance. Replace the heater if badly scaled or the NTC if readings are out of range.

Medium 3/5

Heating Element

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