That's probably why the boiler wont work, if the reset button is stuck down the boiler will not come on. If pressing and fiddling with the reset button does not free it, then you'll probably have to change the overheat stat (this is what the button is connected to).
Boilers don't overheat for no reason, so you may need a engineer to check boiler, but it may have been a faulty overheat stat all along - and replacing may solve the problems.
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