Microwave runs but does not heat food; turntable and light work, timer counts down normally, but food remains cold.
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
Safety Warning: The high-voltage section of a microwave is extremely dangerous. Do not remove the cover or attempt internal repairs unless you are a trained technician with proper tools and procedures.
User-level checks:
- Test with water: Place a microwave-safe cup of water in the center and run on high for 1–2 minutes. If the water is still cold, heating is not occurring.
- Check power level settings: Ensure the power level is set to 100% (HIGH) and not to a low power or defrost setting.
- Listen for abnormal sounds: Note any loud buzzing, arcing, or burning smells. If present, stop using the microwave immediately.
Next steps: A technician will typically test the magnetron, inverter/transformer, high-voltage diode, and capacitor, and replace the failed component. Do not continue to operate a microwave that does not heat.