F3
Emerson
Shorted Keypad or Key Line Error
Microwave displays F3 and will not start; may occur immediately on power-up.
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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
Shorted keypad matrix line, Damaged keypad ribbon, Moisture behind keypad, Failed control board input circuit
How to Fix / Troubleshooting
Safety first: Unplug the microwave.
Dry and clean:
- If F3 appeared after cleaning, allow the keypad area to dry completely with the door open for several hours.
- Do not spray cleaners directly on the keypad; apply to a cloth instead.
Inspect keypad assembly:
- Remove the control panel and disconnect the keypad ribbon from the control board.
- Inspect the ribbon for cracks or burn marks. If damaged, replace the keypad or panel.
- If disconnecting the keypad clears F3 (unit powers without error but cannot be controlled), the keypad is faulty. If F3 remains, the control board is likely at fault.
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Repair Difficulty
Medium
3/5
Required Part
Membrane Keypad
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