F5
GE
Control Board Logic or Relay Failure
Microwave shows F5 and may not respond to keypad inputs or may shut down unexpectedly.
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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 main control board, Stuck relay on control board, Power surge damage to control electronics
How to Fix / Troubleshooting
Safety: Unplug the microwave before any inspection. Do not attempt to repair the control board at component level.
- Power reset: Disconnect power for 10 minutes to clear any transient fault. Plug back in and test.
- Check outlet and power: Ensure the microwave is on a properly grounded outlet and not sharing a circuit with heavy loads that may cause surges.
- Visual inspection: If you remove the control panel (with power disconnected), inspect the control board for burn marks or obvious damage.
- Replace control board: If F5 returns consistently and no other issues (like keypad faults) are present, the main control board is likely defective and should be replaced as an assembly.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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