Just has a problem with my Suburban furnace doing the same thing...Click at furnace no fan,nothing...AC worked fine...I diagnosed it to a bad board on the furnace...
Check to see if you have 12v at the furnace from the thermostat, usually a blue wire..If you do the thermostat is fine..
What make furnace...If it is older the furnace time delay relay sounds like your problem...If it is newer, the relay is on the board and not replaceable (my problem) assuming that it is a Suburban, might be the same for an Atwood furnace.. Don't know how far along you got in troubleshooting, but to me it sounds more like a furnace problem than the thermostat..
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