Why a switched live fan is not switching on?

[ahlondon]

Yes, hence the ...

Broken neutral even with the light working!?

 

[ahlondon]

With a timer fan, if the timed and permanent live feeds are both supplied with power, the fan should operate.
Linking the two terminals simply makes the fan an on/off fan, with no overrun.
If you've proved the fans work (it still may be worth trying with a flex), use a short link wire to join the timed and permanent live connections together.
Then try and connect up the live and switched live in turn (safely isolating power and the other wire when connecting).
If the permanent live is working, the fan should turn constantly.
If the switched live is working, the fan should turn on and off with the switch.
If the fan doesn't work with either - look elsewhere!
The cable to a timer fan would usually be a 3 core + earth; are you sure you've got the grey, brown and black cores marked up correctly?

I haven't actually seen it run because like you say with L and N connected and the light on it should operate until the light is switched off.

If a fan does not require earth can the earth wire be used for the switched live connection instead?

 

[ETAF]

Builder keeps says maybe fans are too powerful for the circuit

Wow - nothing trips at all , hows that work ?
I hope your builder is doing a good job on the bathroom itself and just does not understand electrics at all - BUT....... that comment surprised me

 

[ahlondon]

Get one who can , maybe on recommendation from neighbours
i would expect a GOOD builder - at least the ones i have dealt with over the years, and thats probably 4 in the last couple of years, know and use a competent electrician, and as i know a lot about electronics and electrics - as qualified many years ago , i can question and test

any reason why the electrician did not fix it (other than not a good electrician , maybe the sort that do really basic stuff for builder) - or give a plan of what may be required - seems strange , i would expect an electician to work out whats wrong and why, and if he/she cannot - give a number of options on how to resolve , and price

the course of action is to find out why its not working and put it right or at least give a report (maybe verbal) of what needs to be done

yes for a more accurate and reliable machine , FLUKE would be a common make

any pictures
what type of switch in bathroom -

its pretty basic wiring for a fan

Extractor fan wiring - DIYWiki

flamport is also a member here with aa website

Electrical Information Pages

Electrical Information Pages concerning UK electrical installations in domestic and similar situations

flameport.com

i'll edit if i find the info

 

[ahlondon]

Wow - nothing trips at all , hows that work ?
I hope your builder is doing a good job on the bathroom itself and just does not understand electrics at all - BUT....... that comment surprised me

There were several trips...

 

[ETAF]

There were several trips...

Ok
trips of what decice MCB , RCB , RCBO , consumer main switch - ???
what tripped

 

[opps]

The cables on the right hand side have not been fitted ?

 

[ahlondon]

The cables on the right hand side have not been fitted ?

They are

 

[opps]

Why is he using parcel tape rather than jubilee clamps?

They are

My bad, sorry.

Looks like it needs a switched live-page 13

https://product-portal.gdhv.com/sites/default/files/assets/Xpelair_XIMX_instructionmanual.pdf

And no, it is not acceptable to use the earth as a switched live. Get him to pick up some 3 core and earth cable. As a test, bridge the perm/switched live with a small section of cable.

 

[ahlondon]

Why is he using parcel tape rather than jubilee clamps?


My bad, sorry.

Looks like it needs a switched live-page 13

https://product-portal.gdhv.com/sites/default/files/assets/Xpelair_XIMX_instructionmanual.pdf

And no, it is not acceptable to use the earth as a switched live. Get him to pick up some 3 core and earth cable. As a test, bridge the perm/switched live with a small section of cable.

Thanks. Parcel tape is temporary until I get the duct (I have to run around the getting the 1st fix materials for him)

 

[Jurassicspark]

Where is the extractor fan power supplied from?

 

[ahlondon]

Where is the extractor fan power supplied from?

Directly from circuit to light fitting

 

[Taylortwocities]

Need a better look at that terminal block. Photo is too blurry

 

[Tigercubrider]

A lot of fans don’t switch with the LED loads

 

[Taylortwocities]

A lot of fans don’t switch with the LED loads

Really? I find that unlikely.
Surely the fan is the load.