Wiring problem, please could someone advise?

[TheBartman]

I don't know without taking the top off, but I am sure it should have an overrun....

Ok, just the bedroom left now, that has a light switch for the room, and a light switch for the bathroom light and extractor.

With both off, either will turn on and off. The fan doesn't overrun.

If the bathroom light is on and I turn on the bedroom light, the bathroom plunges into darkness and the fan goes off!!

So, I worked that one out (thanks DIYnot wiki!)! The light switch had live to common, the bedroom light to L1, and the bathroom switch link in L2! D'oh....

So yes, I am partly boasting about how well I have done with my knowledge (total tongue in cheek, it's taken stress, wiki, and the help of you guys! )

The bathroom switch is still bugging me....

1 x 3 core
3 x 2 core

I also have a shaver point in the bathroom.

Would this be a good assumption for wiring?:

1. Shaver red into com
2. light bulb red into L1
3a. Fan blue into blacks
3b. Fan red into com
3c. Fan yellow into L1
4. Live power into com

I believe that's how it's currently wired, yet doesn't explain why the overrun doesn't work. Could you kindly advise if the above is correct or if I should wire it differently?

TBH if it looks good wiring wise, then I shall forget about the overrun and just live with it as'is!

 

[PrenticeBoyofDerry]

So this switch is currently wired as above?
En-suite light switches on/off?
The Shaver socket is working?
The Ex-fan comes on when en-suite light is switched on, but does not overrun when light turned off?

 

[TheBartman]

that is how I assume it is wired, I am only 95% sure.

I cannot test the shave socket as I don't have anything to plug in, and I broke my multimeter! I can keep killing the power and removing cables out of com to confirm which is the link, which is live, and which is the shaver socket.

I have of course assumed the 3 core is the fan, and of course the light comes on and off by switch as does the fan so that's the 2 in L1 sorted (or am I assuming here?), so the 3 cables in com can surely only be live, the shaver socket, and the fan.

The only other thought is that I have made an error of judgement and that the red in L1 should be in Com, and one of the com's in L1?

 

[PrenticeBoyofDerry]

Try swapping the line conductors of the three core for Ex-fan
so
Red to L1
Yellow to Com

 

[TheBartman]

Nope, fan comes on with the light but then never switches off, and only the isolator can turn it off

 

[PrenticeBoyofDerry]

Nope, fan comes on with the light but then never switches off, and only the isolator can turn it off

So swapping the cables has made the ex- fan come on when en-suite light is switched on? But when light switched off the fan overruns but does not switch off?
If so how long did you leave it? Some ex- fans can overrun for more than 20 minutes. The timing can be adjusted.

 

[TheBartman]

30 mins and still on.

I think I am going to switch it back and just accept it only comes on when the light is on, unless you can think of anything else obvious.

I genuinely and sincerely thank you from the bottom of my heart, I couldn't have even begun to have fixed this alone, and not only have I learnt from my mistakes, but I have learnt a lot about light fittings and switches. I just hope I don't need my troubleshooting skills quite so soon!!

THANKYOU!!

 

[PrenticeBoyofDerry]

Check the inside of the extractor fan to see if the time can be reduced on overrun.
Knowing the model type fill help?
As it may have a transformer where the time can be adjusted.

 

[TheBartman]

Votrice TIPO M100 4. Not 4T.


Your honour, I believe that is case closed.

Thankyou to the early contributors, but biggest thanks to PrenticeBoyofDerry.

Thankyou. THANKYOU!!

I shall ensure I put some money in a charity box next time I pass one also to say thanks, do you have a favourite charity you'd like me to donate to?

 

[TheBartman]

Prenticeboy, as you didn't reply, I popped £20 into an autism charity tin today to say thankyou

 

[PrenticeBoyofDerry]

Sorry didn't mean to be rude, a donation to an autistic charity is fine.
My missus actually works in child development and comes across many cases of autistic children. I am sure it will be well received and go towards giving valued care.

 

[securespark]

Prenticeboy, as you didn't reply, I popped £20 into an autism charity tin today to say thankyou

Top man. You're a star.