TImer switch sicks

[vjp...@at.biostrategist.dot.dot.com]

I think the reason my (spring wound) bath fan timer switch sticks is when I
reset it, ie, change it form say 20 min to 40 min. It is spring wound. I know
folks who have such switches for twenty years, and they blame me for my
problems. I have a replacement, and I changed it before every three years,
but am curious if it's my fault to figure it out. Also, may have to extend
the wires using scotchlock, so reluctant.

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Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
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[hrho...@att.net]

Sorry, but your post doesn't make any sense.

If it is a mechanical timer, when you set the time, it starts a clockworks mechanism that closes contacts for the length of time set, and then opens the contacts, to shut of the bathroom fan, for example. If it is a purely electrical type of timer, a motorized clock does the timing for opening a set of contacts and shutting off the ventilating fan.

[vjp...@at.biostrategist.dot.dot.com]

THanks. I seem to be able to avoid the problem by not interrupring the
cycle. If I reset the spring timer from 20 min to 40 min it gets stuck
at 40 min. If I let it finish then reset it, it seems not to stick (as much?)

I've been replacing the switch when it get stuck, every thre years or so,
except a friend with an entire building full of them (running two decades)
tells me to timer isn't the problem, I am.