Statesman microwave making a loud buzzing noise

A loud buzz or hum on a microwave usually means either a normal component has become noticeably noisier, or there’s a developing fault in the high-voltage side. On a 2-year-old Statesman, it’s worth checking the simple things first.

1. Check whether the noise only happens when heating - Run the microwave with the timer set but no heating function if your model allows it, then compare with normal cooking. - If the loud buzz only starts when it is actually heating, the noise is more likely from the high-voltage transformer, magnetron or diode/capacitor area rather than the turntable motor or cooling fan.

2. Try a mug of water - Heat a mug of water for 30–60 seconds. - If it makes the loud hum but still heats normally, it could be a transformer or magnetron getting noisy. - If it hums loudly and heating is poor or absent, that points more towards a fault in the high-voltage circuit.

3. Check for obvious external causes - Make sure the turntable, roller ring and glass plate are seated properly. - Check nothing is touching the casing and that the microwave is standing level. - Listen for fan noise from the rear or side vents, as a fan blade or loose panel can sometimes buzz.

4. Stop using it if there are other symptoms - Arcing, burning smells, intermittent heating, or a much harsher-than-usual hum are warning signs.

Important: isolate it from the mains before inspecting anything, and do not remove the cover unless you are properly trained. Microwaves contain high-voltage components that can remain dangerous even when unplugged. Any internal mains or high-voltage microwave work should be left to a qualified engineer.

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