E12
Schulthess
Temperature sensor / overheating fault
Washer shows E12 and stops; often associated with overheating or very hot door glass.
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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
Shorted NTC temperature sensor, Stuck heater relay on PCB, Wiring short in heater circuit, Incorrect program temperature calibration
How to Fix / Troubleshooting
Safety first: Unplug the washer and allow it to cool completely before inspection.
- Step 1 – Visual check: Inspect the door glass and tub for signs of overheating (steam, strong hot smell). Do not touch hot metal parts.
- Step 2 – Test NTC sensor: Access the NTC at the heater pocket. Measure resistance at room temperature; a very low resistance (near short) indicates a failed sensor. Replace if out of specification.
- Step 3 – Inspect heater relay: On the main PCB, locate the heater relay. Look for welded contacts or burn marks. If the relay is stuck closed, the heater may remain on, causing overheating. Replace the PCB or have the relay professionally replaced.
- Step 4 – Wiring inspection: Check heater wiring for insulation damage that could cause unintended heating. Repair or replace damaged harnesses.
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Repair Difficulty
Professional Required
5/5
Required Part
NTC Temperature Sensor
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