Extractor isolator wiring is missing

[returnButton]

I'm replacing 3 bathroom extractors. I naively thought they'd be like-for-like and the wiring would be the same. The new units are all timed.

I managed to fit the first one fine. Second one, fine. Turns out the third wasn't previously timed. I thought they all were (my oversight), so I bought timed replacements.

What threw me is that they all have isolators which do control them in conjunction with the lights. However in the ceiling for the 3rd extractor there are only two lines, L & N.

So my question is, where is the LS going from the isolator if not into the ceiling extractor?! Will I have access to it if I take the light off? Ideally I would like to make use of the timed feature and not have to send this back and get a non-timed version.

Thanks all.

 

[pete01]

You can link the L and Ls in a timed fan to use it as a non timed fan.

 

[SUNRAY]

I'm replacing 3 bathroom extractors. I naively thought they'd be like-for-like and the wiring would be the same. The new units are all timed.

I managed to fit the first one fine. Second one, fine. Turns out the third wasn't previously timed. I thought they all were (my oversight), so I bought timed replacements.

What threw me is that they all have isolators which do control them in conjunction with the lights. However in the ceiling for the 3rd extractor there are only two lines, L & N.

So my question is, where is the LS going from the isolator if not into the ceiling extractor?! Will I have access to it if I take the light off? Ideally I would like to make use of the timed feature and not have to send this back and get a non-timed version.

Thanks all.

Do you have 2 LS wires (in and out) in the isolator? If so try and follow the cable to see where it changes.
I assume the 3rd wire isn't just cut short?

 

[blup]

Check the rose, the switched live will also serve the fan via the isolator which acts as an intermediate switch, so no need for a third core

 

[SUNRAY]

Check the rose, the switched live will also serve the fan via the isolator which acts as an intermediate switch, so no need for a third core

To use it as a timed run on?

 

[blup]

To use it as a timed run on?

Fair point

 

[returnButton]

Do you have 2 LS wires (in and out) in the isolator? If so try and follow the cable to see where it changes.
I assume the 3rd wire isn't just cut short?

Thanks all, for the input. @SUNRAY , yes 2 wires in & out, and you got me a bit further because the LS wire was indeed there and wrapped round the earth, hence both yellow and I didn't see it.

However still for some reason the fan won't even come on with all wires in and the switch on.

I've checked L & LS and they are live. I even tried another new unit in case it was that, but nothing.

I've now put the old one back on for the night and it's working. So a bit perplexed. Will resume tomorrow.. not how I'd planned to spend my weekend!

 

[SUNRAY]

Thanks all, for the input. @SUNRAY , yes 2 wires in & out, and you got me a bit further because the LS wire was indeed there and wrapped round the earth, hence both yellow and I didn't see it.

However still for some reason the fan won't even come on with all wires in and the switch on.

I've checked L & LS and they are live. I even tried another new unit in case it was that, but nothing.

I've now put the old one back on for the night and it's working. So a bit perplexed. Will resume tomorrow.. not how I'd planned to spend my weekend!

Rarely is

 

[returnButton]

For anyone interested I took the isolator switch off and found that the switched live wasn't actually wired in, so I made it the same as the switch in the "working" bathroom, as well as the wiring going through the lights, and all seems good now.

Many thanks to those who took the time to reply and push me in the right direction

 

[SUNRAY]

For anyone interested I took the isolator switch off and found that the switched live wasn't actually wired in, so I made it the same as the switch in the "working" bathroom, as well as the wiring going through the lights, and all seems good now.

Many thanks to those who took the time to reply and push me in the right direction

thanks for the feedback and letting us know it's resolved.