E20
SMEG
Fatal Control System Error
Microwave displays E20; appears immediately after power-on, no functions available.
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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
Severely corrupted firmware, Major control PCB failure, Incorrect or incompatible replacement PCB, Internal short on logic board
How to Fix / Troubleshooting
Safety: Unplug the microwave. Do not attempt to operate it repeatedly with a fatal error displayed.
Reset attempt:
- Leave unplugged for at least 15 minutes, then reconnect and check if the error clears.
If E20 remains:
- The control PCB will likely need replacement or reprogramming with the correct SMEG firmware.
- Because this is a logic-level failure, there are no safe user-serviceable parts to adjust.
Contact an authorized SMEG service center with the model and serial number for correct PCB replacement.
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Repair Difficulty
Professional Required
5/5
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