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Ga robbo

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Hi all, joined and am after advice about my bathroom extractor fan not working, replaced the fan and transformer with new ones, still no joy. It's wired directly from the fuse box on its own circuit and not connected to the light.
 
What happened in the first place? Did you check for voltage before you got a new fan? have you checked the connections? exactly what is it connected to?
 
Just moved in and it wasn't working, I've checked the voltage and all is fine, it feeds dircet from the fuse box/circuit breaker on its own circuit with a red black and earth cable that runs into a isolation switch and then red black and earth run in to the transformer (earth is covered off not connected) and from there to the fan motor. Do I need an extra permanent live running aswell?
 
Depends on make model of fan, and how it is connected. Pictures always help
Checked voltage where, with what, and what was it?
 
I'll see if I can get pics of the connections and readings on my multimeter later when I get back home. It's an xpelair sslv100ts.
 
There tends to be a switched line conductor and perm line conductor so that your fan comes on when the bathroom light is switched on and then continues to run when the light is switched off (depending on what you've set up).

Pictures would definitely help to see what you've got.
 
This is what it looks like when I remove the cover, hope they are helpful, the wire I to the switch is direct from the fuse box on its own circuit, then goes straight to the transformer and from there straight to the fan motor in the bathroom.
 

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So its designed to run when switched on with the switch you picture. No interaction with lights at all ? Has it ever worked or have you installed it new? What's the third terminal on the transformer input? Could it be for a light trigger signal?
Be careful using your multimeter; typical DIY ones aren't ideal for mains fault finding due to exposed test probe tips and lack of protection if you select the wrong range.
Check 230v supply to the transformer unit, then look for 12 volts coming out. Is there a timer in the transformer unit? If so check its setting.
Look for the 12 volts at the fan unit terminals. I can't remember whether the 12 volts is AC or DC but it should tell you on the units.
 
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It's never worked and I replaced it same model for the same and put the wires back were they were before. I think the third terminal in is a switched live but do i need to use this or just the permanent live? There is a timer on it and it set in the middle at the minute.
 
It will run if you put a supply onto the switched live, (that's what it means) then it will switch off after that supply is removed and the timer has run its course. Normally that switched live is from the room light, but if you just want to switch the fan on and off manually link switched live and permanent live.
 
Ah I will do that and check for 230v at the terminals to see what it's getting when I get back later on.
 
Hi all, managed to sort the issue out over the weekend and found it to actually be a fault I the unit, took it back and swapped it for a new one and all is working perfectly now. Thanks for all the advice.
 
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