A timer fan has two feeds - 1) switched live to trigger the fan 2) permanent
live to keep the motor running on the timer after the light has been
switched off.
It also usually has a common neutral.

Check that one live is always live, and that the other is live only with the
switch on. Check the neutral path. If these are all okay replace the fan
unit.
They're £9.59 in Screwfix.com (if their website is actually working) product
number 15927. If you're worried about upsetting Jerry (see earlier thread
about Screwfix False Promises) you can buy them in B&Q for about £25, or at
your local hardware shop for even more probably! You could buy another
Wickes one for compatibility, but 18 months is a bit short for a fan life
and you may want to try another make.

The usual place to pick up both live feeds and neutral is at the light in
the room where the fan is located. If the fan is okay and you have a supply
problem and can't get into the isolator switch, try looking here first, then
you may have to break into the isolator switch.



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