F12
JennAir
Inverter Communication or Inverter Failure
JennAir microwave displays F12, often on models with inverter technology, and will not heat.
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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 inverter power board, Loose harness between control and inverter, Shorted magnetron drawing excessive current, Control board inverter drive failure
How to Fix / Troubleshooting
Safety First: Microwaves contain lethal high voltage. Unplug the unit and do not touch the inverter, capacitor, or magnetron unless you are trained and equipped to safely discharge high-voltage components.
- Visual inspection: With the cover removed (by a qualified person), inspect the inverter board for burned components, cracked solder joints, or melted connectors.
- Check harnesses: Ensure the wiring between the control board and inverter is secure and undamaged.
- Magnetron check: Inspect the magnetron for burn marks or cracks. A shorted magnetron can cause inverter failure.
- Component replacement: In most cases, resolving F12 requires replacing the inverter board and sometimes the magnetron. This repair should be performed by a qualified microwave technician due to high-voltage risks.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Board
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