Timed bathroom extractor fan

[chris speirs]

Hi,

I've just fitted a bathroom extractor with timer but it only goes on and off with the light switch

is it just a case of swapping the live and switch live round?

 

[mikeyd]

I would expect the fan to run all the time if switched live and permanent live were the wrong way round.
Can you give more details how you wired it, for example was the wiring already there or did you take a 3 core (+earth) from somewhere?

 

[EFLImpudence]

I would expect the fan to run all the time if switched live and permanent live were the wrong way round.

No - because he will be disconnecting the switched live from what is (should be) the permanent live terminal of the fan.

The fan will only run when both its PL and SL are receiving the voltage.

 

[chris speirs]

There was already a fan there with 2 brown and 1 blue so I just put them back the same way, well I thought I edit but obviously not, what would be the harm in swapping them over?

 

[EFLImpudence]

what would be the harm in swapping them over?

None - as long as blue is connected to Neutral.

 

[chris speirs]

And do you think that will fix the problem?

 

[EFLImpudence]

Well, if that was the problem - yes.

Try it first, then we'll know if it wasn't.

 

[ban-all-sheds]

None - as long as blue is connected to Neutral.

Don't you mean as long as the blue is neutral?

 

[EFLImpudence]

Yes, but with regard to the question asked, my reply is reasonable.

I could say I meant at both ends.


Also, at the same time I was replying to a similar thread where a Grey was neutral but connected to L.

 

[ban-all-sheds]

I could say I meant at both ends.

Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

Also, at the same time I was replying to a similar thread where a Grey was neutral but connected to L.

Load L, I presume.

 

[stem]

There was already a fan there

Did the fan you took out have a timer on it? and if so, did the timer ever work? What make / model was it?

with 2 brown and 1 blue so, I just put them back the same way.

Having never seen a single cable with 2 brown and 1 blue wires, I assume that there is more than one cable going to the fan. So are there other unused wires? if so, where did they go, or were they just cut off?

Please describe what terminals each of the 3 wires was connected to on the original fan, (for example (L)'Live' (S/L)'Switched Live' (N)'Neutral') and what the terminals are marked on your new fan that each goes to. What make / model is it?

 

[ban-all-sheds]

Having never seen a single cable with 2 brown and 1 blue wires, I assume that there is more than one cable going to the fan.

That's one assumption.

Another is that some numpty has put brown sleeving over the cpc of some twin & earth....

'twould be well to find out....