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[Dennis]

Investigating a faulty fan, I found power to the junction box above and the switches inside. :D
But no joy unless I move the negative cable to the earth terminal, inside the junction box, then everything works. The isolating double-pole switch on the worktop seems to be wired correctly.
Thinking that the inplications are faulty earth I have disconnected the unit.
Anyone any ideas? :?:

[rhy]

get a local sparky in just to trace the wiring and then he can connect it up properly and put your mind at rest cause it will be wired correctly and safely.

[ericmark]

You have lost the neutral will guess faulty isolator switch but this could easy cause danger and you will be better calling a spark.