Roof vented sog fan not always working, Switch or fan

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Like the title says, our roof vented sog has not worked a few times, but I can never get it to do it when I have meter available. I'm suspecting the switch but wondering how many have found it to be switches and how many fans?
 
Like the title says, our roof vented sog has not worked a few times, but I can never get it to do it when I have meter available. I'm suspecting the switch but wondering how many have found it to be switches and how many fans?
Ours has a little contact switch at the back of the place the cassette slides into. If yours has the same look for a small black switch with a metal bit sticking out from it. If you actuate the switch the fan should start. If it doesn't then you need to start fault finding. If the fan does work when you manually operate the switch then there may be some misalignment or the bit of plastic on the slide which actuates the switch is broken or bent.
 
Experience says that the microswitch fails more than fans do. However this experience is with IBM cashmachines and retail point of sale.

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Ours has a little contact switch at the back of the place the cassette slides into. If yours has the same look for a small black switch with a metal bit sticking out from it. If you actuate the switch the fan should start. If it doesn't then you need to start fault finding. If the fan does work when you manually operate the switch then there may be some misalignment or the bit of plastic on the slide which actuates the switch is broken or bent.

Thanks DBK I know where the switch is but any amount of wiggling can't get it to fail, which is why I'm wondering whether it could be the fan?
 

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