E20
Schulthess
Inverter / motor power stage fault
Washer shows E20; motor runs erratically or not at all.
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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 motor windings, Failed inverter module on PCB, Loose motor harness, Overheating of power components
How to Fix / Troubleshooting
Safety first: Unplug the washer. High voltages are present on the inverter even after power-off; allow time for discharge.
- Step 1 – Inspect motor and harness: Remove rear panel, check motor connector and cable for damage. Ensure no signs of burning.
- Step 2 – Motor test: For brushless motors, measure winding resistances between phases; they should be equal. Any short to earth or imbalance indicates a faulty motor.
- Step 3 – PCB inspection: Remove the main PCB and inspect the inverter section (large heat-sinked components). Burn marks or cracked components indicate failure.
- Step 4 – Replacement: Replace the inverter/PCB and, if necessary, the motor. This repair is complex and should be performed by a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Control Board
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