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sounds like one of the supply fuses at the house panel,these 240 volt dryers are wired so the timer is on one phase(120)volt and the motor is on the opposite phase(120)volt and the heating element is on both phases for a combined 240 volts,if you lose one phase you either wont get motor operation or timer operation,and for sure no heat and you have the timer so you have 120volts
Try to twist the outside ring around the timer knob. The knob could be faulty and freewheeling, so turning the outside ring (I'm assuming you have a mechanical timer, not an electronic one) does the same thing as turning the knob while it is "out". When you've set the timer, then push the knob in to start. Hope this helps - I made some assumptions about your machine that I hope are correct... Good luck.
If you are talking about the starting switch "knob", you will not normally repair that, you will replace it.
If you are talking about the timer switch you normally do not repair the timer switch either...replace it.
If you do decide to replace either switch, remove and replace one wire at a time, this will save you problems with the wiring.
Remove and inspect the timer knob for a crack or missing tension clamp.
Carefully place it back on the timer shaft while paying attention to the (D) shape in the knob and the shaft.
If they are aligned correctly notice where the position arrow is pointing, ie; off---run--etc.
You may well need a new knob.
Normally, to remove the timer knob, simply push in on the timer knob
and turn the knob counter clockwise. it should unscrew itself. If it
does not, the shaft inside the timer has broken and the shaft simply
free wheels so then you need to take a needle nose pliers to hold the shaft and then you can turn the knob or pull it off