Microwave runs but does not heat food; no error code displayed.
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 is extremely dangerous. Do not open the cabinet or attempt HV repairs unless you are a trained technician.
User checks only:
- Verify that you are using microwave-safe cookware and that the load is appropriate (e.g., a cup of water) to confirm lack of heating.
- Check that the timer and power level are set correctly (100% power for testing).
- Listen for the usual humming sound when heating starts. If the fan and light run but there is no hum, the HV system may not be energizing.
- If there is a burning smell, loud buzzing, or arcing, stop the microwave immediately and unplug it.
Do not continue to use the microwave if it runs without heating; this can further damage internal components. Contact a qualified SMEG technician for diagnosis and replacement of HV parts.