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 is extremely dangerous. Do not attempt to test or replace magnetron, capacitor, diode, or transformer unless you are trained. For most users, this repair should be left to a professional.
- Step 1 – Confirm symptom: Place a microwave-safe cup of water inside and run on full power for 1–2 minutes. If the water remains cold and the unit appears to run normally, heating is not occurring.
- Step 2 – Basic checks only: Verify that you are using the correct power level and that the timer is set properly. Ensure the door is fully closed and latched.
- Step 3 – Professional diagnosis: Internal diagnosis involves testing the magnetron, HV diode, capacitor, and transformer. This requires safely discharging the capacitor and using appropriate tools. Contact a qualified appliance technician familiar with Swan microwaves.
Do not continue to operate a microwave that runs without heating; further damage may occur.