F9
Amana
Power Supply or Line Voltage Error
Microwave displays F9 and may not heat 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
Incorrect line voltage, Loose power cord connection, Failed line filter or noise filter board, Faulty main relay on control board
How to Fix / Troubleshooting
Safety First: Disconnect power before inspection.
- Verify outlet: Use a plug-in tester or multimeter to confirm the outlet provides correct voltage (typically 120 VAC in North America) and is properly grounded.
- Check cord and plug: Inspect the power cord for cuts, burns, or loose prongs. Replace the cord if damaged.
- Inspect line filter: With the cover removed, visually inspect the line filter/noise filter board for burned components or loose connections.
- Secure connections: Tighten any loose spade connectors on the line filter and main relay (with power disconnected).
- Component replacement: Replace a damaged line filter board or main control board if F9 persists and voltage supply is confirmed good. Professional service is recommended for live-voltage diagnostics.
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Repair Difficulty
Professional Required
5/5
Required Part
Line Filter Board
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