Microwave displays E20 and the unit becomes unresponsive after a power outage.

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.

Possible Causes

Corrupted EEPROM data due to power surge,Defective memory chip on control board,Failed firmware update (if applicable),Control board failure

Safety: No internal access required for basic steps.

Steps:

1. Long power reset: Unplug the Blomberg microwave for at least 30 minutes to allow capacitors to discharge and the control to fully reset.
2. Try factory reset: If your model supports it, perform a factory reset sequence as described in the user manual.
3. Surge protection: After resolving the issue, use a quality surge protector to prevent future memory corruption.

If E20 persists, the control board will likely need replacement, as EEPROM chips are usually not serviced separately.

Hard 4/5

Main Control Board

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