F9
JennAir
Line Voltage or Power Supply Error
Microwave shows F9 and may shut off or refuse to start; often related to power or line voltage issues.
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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, Faulty line filter board, Defective control board power supply section
How to Fix / Troubleshooting
Safety First: Unplug the microwave before inspecting internal wiring. Only qualified persons should test live voltage.
- Verify outlet: Use a multimeter to confirm the wall outlet supplies the correct voltage (typically 120 VAC). If voltage is low or fluctuating, contact an electrician.
- Inspect power cord: Check the JennAir microwave power cord for cuts, burns, or loose prongs. Ensure it is firmly plugged into the outlet.
- Check terminal connections: With power disconnected, remove the outer cover and inspect where the power cord connects to the line filter or terminal block. Tighten any loose screws and look for burned terminals.
- Inspect line filter board: Many JennAir microwaves use a small line filter board. Look for burned components or cracked solder joints.
- Control board power supply: If the line filter is good, the low-voltage power supply on the electronic control board may be failing and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Line Filter Board
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