Extractor fan question

[garyds65]

Help!

have moved into a new house and the downstairs toilet has an extractor fan that is switched on when you switch on the light (light pull type). outside the toilet is a fan isolator switch that should enable you to overide the light pull and turn off the extractor i.e. so when the light switch is pulled the extractor doesn't come on (at least thats what you can do on my upstairs ones otherwise whats the point of the isolator??).

Anyway when you turn off the isolator switch for the fan, the light doesn't work either so we can only have both or none on.

Any ideas please - I'm presuming that the isolator/light must have been wired incorrectly?

 

[Spark123]

Sounds like they have used the fan isolator to supply the light too, this is incorrect as it should only kill the 2 live and the neutral from the light to the fan.

 

[breezer]

is how it should be wired

 

[garyds65]

thanks guys

looking at the fan it has 2 brown wires running to L, 1 Black to N and 1 Blue and 1 grey to LS.

I'm assuming 1 of the browns and the blue are running from the light pull?

looks like i'll have to leave it as is as obviously being ground floor all the wires are run above ceiling and don't really want to pull it all diown just to sort it out, unless any suggestions?

 

[Taylortwocities]

What wires have you got where in the back of the fan isolator switch?