Kenmore Microwave Error Code F9 — Inverter Failure
What this means
Error F9 indicates the inverter board that controls microwave power output has malfunctioned. The inverter allows the microwave to operate at variable power levels. When it fails, the microwave cannot produce any heat.
Step-by-step fix
3 stepsPower cycle
Unplug for 10 minutes and try again.
Test heating
Place a cup of water inside and try a 30-second cycle. If water stays cold, the inverter has likely failed.
Schedule professional repair
Inverter replacement involves high-voltage components and must be done by a qualified technician.
When to call a professional
Inverter replacement is a professional-only repair due to high-voltage components.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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