my white knight ( the smallest model ) tumble dryer timer switch sometimes sticks. i believe that you have to turn the switch all the way round to maximum then back to the time you actually want . having done this it still sticks on the odd occasion. does anyone have the same problem ?. my machine i s only 3 months old .
is it in a cold room?.this can cause them to stick.Also pull the timer knob out a bit so it doesn't rub on the plastic fascia as it rotates.If that don't work ring servicing and they will fit a new one
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Try fixfault.com to fix tumble dryers.