Bathroom fan

[Darbs]

I have a bathroom fan that requires replacing as becoming quite noisy. The original is an Emma, had it for years, but I’ve bought a Vent-Axia VASF100B as a replacement. Wired it as per the instructions, but fan doesn’t work when switched on. Outside the bathroom, there is a separate rectangular box with a timer dial as well as a separate isolator switch. Everything lights up when powered up, but there doesn’t seem to be any power to the fan. Ideas?

 

[terryplumb]

Wired incorrectly ,duff fan maybe ,loose connection ,how about you post pics ?

 

[chivers67]

You could test the fan if you have a plug and two pieces of wire to terminate into the fan (fan first) as a temporary power source to be certain it works if it works then this would point to the wiring to the old fan wiring being defective or incorrectly wired unless the isolator has a fuse that could perhaps be blown?

 

[EFLImpudence]

Old fan was 12V ???

 

[Darbs]

Done some checks and tests. The fan is 12v, hence the reason it won’t work. The one I bought is 240v.
Can I use the current wiring to bypass the 12v transformer and run the 240v one from the isolation switch? I don’t think the 12v is powerful enough.

 

[ban-all-sheds]

I’ve bought a Vent-Axia VASF100B as a replacement.

Which is a 230V fan.

Outside the bathroom, there is a separate rectangular box

Which is 99.9999% likely to be a 12V supply for your old fan.

Ideas?

Either rewire to take 230V to the fan, or buy a 12V one.

 

[ban-all-sheds]

Can I use the current wiring to bypass the 12v transformer and run the 240v one from the isolation switch?

1. What type of cable runs from the transformer to the fan?
2. Your existing fan has a timed overrun. Are you aware that you've bought one without that feature?

I don’t think the 12v is powerful enough.

There is absolutely nothing intrinsically wrong with 12V fans.

 

[Darbs]

Currently the cable is 3 core T&E. The earth isn’t used at the fan, just sheathed and tucked away.

I am aware that the fan I bought doesn’t have an overrun. I’ve taken it back and bough the ‘T’ model which has a timer. I don’t reslly want to rewire as the cable runs under the loft floor which has been converted to a bedroom and would mean taking up the carpets and quite a lot of upheaval.

 

[chivers67]

Done some checks and tests. The fan is 12v, hence the reason it won’t work. The one I bought is 240v.
Can I use the current wiring to bypass the 12v transformer and run the 240v one from the isolation switch? I don’t think the 12v is powerful enough.

Find out what all cable(s) run between the transformer to the fan and from the power source, if you have three core and earth 1/1.5mm you should be ok.

The Isolator switch i'd hope to be a wider double pole type for three core cable but without pictures it's just a pure guess - so find out. One of the wires will be a switched live and the other a permanent live for overrun/timer

 

[ban-all-sheds]

Currently the cable is 3 core T&E.

Do you mean twin & earth or 3-core & earth?

If the former then you don't have enough cores to be able to use a timed overrun fan.

 

[Darbs]

I’ve been and bought another 12v fan, seemed the easiest option. Thanks for the help advice.