Hi, in my cloakroom I have a light and extractor fan ( no windows ),
the fan has a run on of a few minutes after the light switch is turned
off which is fine and alll works dandy. The issue is that the switch
for the cloakroom is on the outside, which again is fine but what
tends to happen is that they switch on the light first, enter the room
do their business and then close the door leaving the light and hence
the fan on. It can be quite some time before someone realises that the
light is still on - wasting power and melting ice caps etc.....

I was in B&Q the other day and saw a neat little timer delay switch
with touch control, looked exactly what I was after, replaces a normal
light switch, did a soft start of the light and remained on for a
configurable number of minutes before switching off. I bought one of
these and fitted it, all seemed ok, nice soft start of the halogen
lamps and fan came on. after 5 minites light went off and fan remained
on as I'd expected. What I did not expect however is that the fan
just stayed on! and didnt go off at all even after the normal run on
time had well elapsed.

I had to remove the switch an revert back to the old one.

Can someone please advice what is going on here and also what the
solution should be - apart from putting the switch in the room...

regards

Nigel