F20
JennAir
EEPROM or Memory Error
JennAir microwave displays F20 and may not start or may lock up after setting a cook time.
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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 control board memory, Failed EEPROM chip, Power surge during operation, Defective control board
How to Fix / Troubleshooting
Safety First: Disconnect power before accessing the control board.
- Power reset: Unplug the microwave for at least 10–15 minutes to allow the control to fully discharge. Restore power and test.
- Check environment: Avoid plugging the microwave into circuits with frequent brownouts or surges. Consider using a surge protector rated for microwaves.
- Control replacement: If F20 returns after a reset, the electronic control board memory is likely corrupted. Replace the control board with the correct JennAir part number.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Control Board
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