Maytag · Microwave Serious
F7E1 — Inverter Board Failure (Inverter Models)
On inverter-equipped Maytag microwaves, the control has detected a fault in the inverter power supply that drives the magnetron.
- Keep using it?
- Limited use only
- DIY difficulty
- Hard
- Verified against
- maytag.com ↗
How to fix it
- WARNING: Microwave high-voltage circuits remain dangerous after unplugging. This repair is for qualified technicians.
- Unplug the microwave and wait at least 5 minutes to allow capacitors to discharge.
- Discharge the high-voltage capacitor with an insulated screwdriver before any work.
- Inspect the inverter board for burn marks, bulging components, or melted solder.
- Test the magnetron filament for continuity and check for shorts to chassis.
- Check thermal cutouts on magnetron and cavity for continuity.
- Verify the cooling fan spins freely and runs during operation.
- Replace the inverter board; if the magnetron is also shorted, replace it as well.
- Test heating with one cup of water for 60 seconds — water should be hot.
Why it happens
Typical signs: F7E1 at start of cook cycle · Microwave runs but does not heat food · Buzzing or arcing sound from inverter area · Burnt smell
- Failed inverter board Inverter cannot generate proper HV to magnetron — most common cause.
- Failed magnetron Magnetron has shorted or opened, taking out the inverter.
- Tripped thermal cutout Magnetron or cavity thermostat has opened due to overheating.
- Failed cooling fan Fan failure caused thermal protection to trip.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Maytag microwave codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: maytag.com.