Extractor fan - going slighty mad

nick11

I am replacing an bathroom extractor fan with one than has a humidistat.

Simple job, or so it seems, just a Neutral, Live, and Switched Live wires to plug in.

It should come on when the light is on and stay on either until the timer ends or the humidity falls, whichever is longest.

However, unfortunately it comes on when the light is off and goes off when the light is on!

So...any suggestions as to what I have done wrong?

latecomer

Yup - I suspect you've wired it up wrong

Did you simply take the wires from the light and extend or something else?

nick11

There was an existing fan. Just took the old one out and put the new one in so the wiring was already in place and the old fan worked OK.
The old one had a just a timer. New one has a timer and a humidistat, not that that has anything to do with it.
I just can't imagine why it works in reverse.

1984ReturnsForReal_2

Forget the rest for a second.

Does the timer work & it switches itself off after a period of time or not?

nick11

Yes, both the timer and the humidistat work correctly, just only when the light is off.

When I turn the light on, the timer takes effect and the fan turns off after the prescribed length of time.

1984ReturnsForReal_2

nick11 wrote: »

Yes, both the timer and the humidistat work correctly, just only when the light is off.

When I turn the light on, the timer takes effect and the fan turns off after the prescribed length of time.

I would be working out which wire needs to go on the opposite side.

Sounds like the live & switch live are in reverse.

Just a thought


And please get a 2nd opinion before I get you to set fire to your house.

keystone

1984ReturnsForReal wrote: »

Sounds like the live & switch live are in reverse.

If does.

OP - don't the MIs not tell you which wire goes where?

1984 - Now heres another conundrum. As this is a replacement of an existing fan Part P does not apply. But does it need a Minor Works Cert? On balance I think not but it could be argued either way. Just interested in your opinion.

Cheers

nick11

Well, the mystery is solved.

The fan came from Screwfix with no instructions but they have them on the website. Alas they are wrong. I found another set of instructions on TLC and it now works beautifully.

If anyone buys one the £32.99 Manrose Humidistat fan from Screwfix then be advised that the wiring left to right is:
N, SL, L
Not
SL, L, N as indicated.

Grz.26

hello, congrats on fixing it, im in the market for a fan like this and was wondering how would you rate this fan?

thanks

richard