E20
Siemens Internal Overcurrent or Short-Circuit Protection

Microwave shows E20 and may not start or may shut down unexpectedly.

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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 component on control PCB, shorted fan or turntable motor, damaged wiring harness, internal line filter failure

How to Fix / Troubleshooting

Safety warning: Overcurrent conditions can cause arcing and fire. Disconnect power immediately if you smell burning or see smoke.

User-level steps:

  • 1. Disconnect power: Unplug the microwave or switch off the breaker.
  • 2. Visual inspection: Without removing the cabinet, inspect the power cord and plug for damage or burn marks.
  • 3. Do not reuse: If E20 appears repeatedly, do not continue trying to operate the microwave.

Technician-level:

  • Open the cabinet and inspect for burnt components or wiring.
  • Test motors (turntable, fan) for shorts to ground.
  • Replace the faulty component or control PCB.

This fault requires professional service; do not attempt to operate the unit until repaired.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB or Motor (as diagnosed)
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