Swan
High-Voltage Component Overload or Short
Microwave makes loud buzzing or humming noise during operation, louder than normal, sometimes with a burning smell.
Advertisements
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.
Advertisements
Possible Causes
Shorted magnetron, Failing high-voltage transformer, Shorted high-voltage diode, Arcing inside waveguide or cavity
How to Fix / Troubleshooting
Safety warning: Unplug the microwave immediately if you hear abnormal loud buzzing or smell burning. High-voltage components may be failing.
- Step 1 – Inspect interior: Look inside the cavity for burn marks, especially near the waveguide cover (mica plate on the side wall). Replace a burnt or damaged waveguide cover.
- Step 2 – Check for metal objects: Ensure no metal utensils, foil, or twist ties are inside causing arcing.
- Step 3 – Do not continue use: If noise persists with correct loading and a clean cavity, internal HV components are likely failing. Further use can cause more damage or fire risk.
- Step 4 – Professional repair: Have a qualified technician test and replace the magnetron, transformer, diode, or capacitor as needed.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements