E91
Electrolux
Display Board Power/Communication Failure
Microwave shows E91 and does not respond to commands; display may be blank or partially lit.
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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
Failed display PCB, Open low-voltage supply to display, Loose display harness, Faulty main control board
How to Fix / Troubleshooting
Safety: Unplug the microwave before removing the control panel.
User-level actions:
- Power reset: Disconnect power for 10–15 minutes and then reconnect.
Technician-level actions:
- Remove the control panel and inspect the display board and its connectors.
- Verify low-voltage supply (e.g., 5V) is present at the display board.
- Reseat or replace the wiring harness between the main board and display.
- If supply is present but the display is dead, replace the display board. If supply is missing, replace or repair the main control board.
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Repair Difficulty
Hard
4/5
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