E20
Westinghouse
Control CPU / Firmware Fault
Microwave shows E20 and the unit will not respond to any keypad input.
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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
Corrupted firmware on control board,Electrostatic discharge damage,Power surge damage,Defective microcontroller
How to Fix / Troubleshooting
Safety first: Unplug the microwave before any disassembly.
User-level steps:
- 1. Extended power reset: Unplug the unit for at least 30 minutes to fully discharge internal circuits, then plug back in.
- 2. Try key combinations: Some models have a hidden reset (e.g., holding STOP/CLEAR and another key). Refer to the service manual if available.
Advanced steps:
- 3. Inspect control board: Remove the control panel and check for obvious damage (burn marks, cracked components).
- 4. Replace control board: If E20 persists and no external cause is found, replace the main control board with the correct Westinghouse part.
Firmware reprogramming is typically not supported in the field; board replacement is the standard repair.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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