E20
Neff
General Motor / Inverter Error
Washer-dryer shows E20; general motor or drive system error on some Neff/Bosch platforms
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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
Defective inverter module (for brushless motors), Shorted motor windings, Faulty motor hall sensor, Wiring harness fault between motor and inverter
How to Fix / Troubleshooting
Safety first: Unplug the appliance. Motor and inverter circuits carry dangerous voltages.
Step-by-step checks:
- 1. Visual inspection: Remove rear panel and inspect motor and wiring for burn marks or loose connectors.
- 2. Test motor windings: Disconnect motor plug and measure resistance between windings (for brushless motors). All phases should be similar. A short to earth or large imbalance indicates a faulty motor.
- 3. Check hall sensor (if fitted): Inspect the hall sensor connector on the motor. Replace the sensor or motor if damaged.
- 4. Inverter module: The inverter is often integrated into the main control. If motor tests good but E20 persists, the inverter/control board likely needs replacement.
When to call a technician: Motor and inverter diagnosis is advanced; professional service is strongly recommended.
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Repair Difficulty
Professional Required
5/5
Required Part
Motor/Inverter Control Module
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