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Twoten you’re absolutely right; of course it wasn’t plugged in. The plug was removed and a multimeter tested across the earth terminal and the live / neutral pins, since the m/c is leaking to earth.

Your conclusions are exactly what the Engineer & I came up with. With regard to damp however, the m/c has been in the same place for 5 years now and never misbehaved even during damp winters.

Therefore maybe there is a residual “normal” background leakage – probably due to some damp – and the broken sensor wire was all that was required to push the leakage over the circuit breaker’s threshold (although it did not appear to be touching the cabinet). It was run after this sensor wire was mended for a short cycle last night without incident .

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