Issue replacing a bathroom extractor fan

That is obviously true. However, whilst 12V is 12V, 12V is not 16.5V which is what the OP was measuring. It's quite probable that such is the no load (minimal load) output of the ("12V") device, but I suppose it's also possible that it has become ill.
There might be another reason. What's the peak voltage of 12V RMS?
Well, if it were a sine wave, it would be around 17V. However, if the 'transformer' is an SMPS, then goodness knows what waveform it is (so the peak could be anything from 12V upwards), and goodness knows how a simple multimeter would interpret the waveform. Such issues could, indeed, explain the OP's measurements.

Kind Regards, John
 
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Specification said:
Power Output (Watts/kW): 13W
So just over 1A
I suppose so - but the concept of the 'power output' of a fan is an interesting one which, if taken literally, has nothing directly to do with the amount of electrical power consumed (other than establishing a lower bound for the latter, since Mr Physics doesn't like efficiencies >100%!)!

Kind Regards, John
 
had a quick nosy around the loft yesterday and found a transformer, took the details off of it to check what its for and turns out its for our shower! So will have to go back up at the weekend to look for another transformer!
 
found the transformer, have removed it wired in a junction box and can report all is working perfectly!

Thanks for all your help, couldn't have gotten there without you :)
 
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found the transformer, have removed it wired in a junction box and can report all is working perfectly! Thanks for all your help, couldn't have gotten there without you :)
Fair enough, but (assuming you're still using it) are you sure that the cable that used to go from the output of the transformer to the 12V fan is suitable for mains voltage? What sort of cable is it, and does it have an 'earth'?

Kind Regards, John
 
Hi john,
Looked like regular electric cable, same as everything else on every other socket. Same as what was used on our old electric shower.
And yes there was an earth which I've connected, which is also earthed under the bath along with the old shower earths which in turn connects to the radiator
 

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