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It is highly unlikely a mercury switch thermostat is not working.
It could be what John said or from the symptoms you have described either the controller has failed, or the low temp switch is not telling the controller to start the fan. Then the fan does not start and you go into either a time-out mode or overtemp.
it is also possible the thermostat turns the furnace off before the fan can start, but that's unlikely.
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Last edited by 1990C4S; 12-08-2017 at 08:24 AM..
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