Russell Hobbs microwave keeps blowing the fuse

If it trips the fuse or RCD the moment you press Start, that usually points to a serious internal fault rather than something simple like the door not closing properly. On a microwave, the common causes are the door interlock switches, high-voltage capacitor, high-voltage diode, transformer, magnetron, or wiring fault.

Before doing anything internal, isolate it from the mains. Microwaves can retain a dangerous high voltage even when unplugged, so they are not a good DIY appliance unless you are properly trained.

A few sensible checks you can do first:

1. Try a different socket Use a known good wall socket, not an extension lead. If it still blows the plug fuse or trips the RCD immediately, the fault is almost certainly inside the microwave.

2. Note exactly when it trips If it trips as soon as Start is pressed, that often suggests a high-voltage or interlock fault. If it trips when opening/closing the door, that more strongly points to the door switch system.

3. Check the plug and lead Look for signs of burning, damage, or a crushed mains lead. Also confirm the plug has the correct 13A fuse fitted.

4. Inspect for obvious internal signs only if competent After isolating from the mains, a trained person might look for burnt terminals, damaged door switch mounts, or shorted components. But I would not recommend DIY testing of microwave high-voltage parts.

Because this involves mains and high-voltage circuitry, I’d strongly advise a qualified engineer. Depending on age and repair cost, replacement may be more economical than repair.

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