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PostPosted: Mon Aug 27, 2018 12:59 pm 
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I’m trying to replace a very old bathroom extractor fan (by old I mean over 15 years!).

We currently have a switch, a pull chord which we use to turn the extractor fan on/off. This is independent of the light switch. Essentially the extractor fan can be operated without the need of any light in the bathroom.

The new extractor fan we have is a Vent Axia Centra Selv HT, model number 443176A. It comes with the extractor fan and a transformer(controller). Now connecting the two together seems quite straight forward. I use a 3 core wire and connect up the Switch live, Live and Neutral.

The issue I have is connecting the main supply to the transformer. There are two cables, they look like normal lighting cables, live, neutral and earth. When taking the existing extractor apart I noticed both cables connected to a 3 pole isolator I believe (it has l1,l2 and l3 etc written on it).

I did do a continuity test but there was no beep for either of the cables.

Any ideas as to what I should do?

If it helps I could upload some images if need be


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PostPosted: Mon Aug 27, 2018 1:48 pm 
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Pictures always help

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PostPosted: Mon Aug 27, 2018 1:55 pm 
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PostPosted: Mon Aug 27, 2018 7:02 pm 
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and the other ends of the cable?

What are the pictures of? The last one looks just like its just a choc bloc

Pictures of the fronts of said items would also help

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Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

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PostPosted: Tue Aug 28, 2018 7:51 am 
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Apologies, I should have explained what the images where of. The images I’ve uploaded are of the small connection box which connects to the the old extractor. So in essence it just clips onto the extractor fan and away you go. I didn’t remove any cables when I unplugged that small socket, that’s exactly how I found it. Naturally the other end of these cables are coming from the wall. (2 cables, each consisting of a black, red and earth wire)

The two red wires were taped together with some insulation tape, and the black and earth wires you can see are connected to the small connection box.

On that second image, of the connection box, the pin holes from left to right are labelled, N - L3 - L2 - L1 - Ground

I hope that makes things clearer.


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PostPosted: Tue Aug 28, 2018 7:53 am 
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Perhaps this image makes things clearer to see


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PostPosted: Tue Aug 28, 2018 9:18 pm 
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I think the bits you have are confusing the issue.

Let us start again.

Lecy OFF as wine~O would say

Do you have 2 twin and earth cables, where they are joined you are saying the 2 reds are just twisted and tapped?

Do you also have a separate pull cord switch ? (I think you said you have) Open it up and see what colours you have and what are they connected to.

This should mean you have 2 blacks not connected to "anything" (apart from this odd/ funny connector you have)

is this correct so far?

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PostPosted: Wed Aug 29, 2018 10:54 am 
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Thanks for the response. I haven’t got a photo at hand of the separate pull chord, however, after opening it up it has a single cable, red, black and earth. The red and black are connected to their respective pins, L and N.

Regarding the rest of your response, you are correct with everything you say.


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