Samsung microwave keeps blowing the fuse

If it trips as soon as you press Start, that usually points to a fault in the high-voltage side rather than something simple like the door catch, although it’s hard to be certain without testing. Unfortunately, microwave faults that blow fuses/RCDs are not often “cheap fixes”, and they can be dangerous to investigate.

1. First, note exactly what is tripping: - If it blows the 13A plug fuse, that suggests a heavy current fault/short. - If it trips the RCD/RCBO, that suggests current leaking to earth. - If it only happens on microwave heating, but not on clock/light/turntable-only functions, that strongly implicates the high-voltage circuit.

2. Try a simple isolation check: - Test it on a different wall socket if possible. - Remove any extension leads. - If it still trips immediately when heating starts, the fault is inside the microwave.

3. Check whether it trips on all cooking modes: - Microwave only - Grill only - Combination mode If grill works but microwave mode trips, that narrows it to parts such as the high-voltage transformer/inverter, capacitor, diode or magnetron.

4. Inspect only externally: - Look for damage to the mains lead or plug. - Check the plug fuse is the correct rating.

5. Do not remove the cover unless you are properly trained: - Microwaves contain a high-voltage capacitor that can retain a dangerous charge even when unplugged.

Given the symptoms, I’d strongly recommend a qualified microwave engineer. Isolate it from the mains before any inspection, and for any internal, mains, or high-voltage work use a competent professional.

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