How to fix the bathroom fan?

I have a Silavent M2000\4 Timer Model 110A in my bathroom. It was getting noisier with time and took longer than usual to turn off after I switched off the light. So I cleaned all the dust inside as I thought that was the source of the problem. Now when I turn the light off, the fan does not stop at all and I have to switch off at the mains instead. Did anybody have this kind of issue before and if so, how can it be fixed?
Linda C., March 2007


done
yes it works on a timer, but the switch is more like a kind of small 'knob switch'. I did turn it down to minimum but didn't solve the problem. Something went wrong while I was cleaning the fan, don't know what... may be it is too old now. anyway thanks.
I might need to replace it.

Linda C., March 2007
if it works on a timer, try taking cover off and look for timer switch usually turns by inserting a 1pence turn it down to minimum and replace cover - it should be on shortest cycle and turn off in a minute. if no thing to turn its a fixed time and sounds like you need to replace the fan I guess

cheeny, March 2007
link Click here to see other fixes for Silavent.