Microwave runs but does not heat food; turntable, light, and fan operate normally.
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.
Possible Causes
How to Fix / Troubleshooting
Critical Safety Warning: The high-voltage section of a microwave (transformer, capacitor, diode, magnetron) can deliver lethal shocks even when unplugged. Do not attempt to service these components unless you are a trained technician.
User-level checks:
- Verify settings: Ensure you are not in a low-power or demo mode. Try heating a cup of water on full power for 1–2 minutes.
- Listen and observe: If the unit sounds unusually quiet (no typical humming) while running, the high-voltage system may not be energizing.
- Check door seal: Ensure the door closes firmly and the seal is intact; however, a door issue usually prevents operation entirely rather than just heat.
Recommended action: A technician should test the Frigidaire magnetron, high-voltage transformer, HV diode, and thermal cutouts, and replace the failed component. Because of the risk, this is not a DIY repair for most users.