when you remove the panel to access the board there is a switch that shuts off power to the furnace, if you push the switch in it should power the board, the most common problems with that type of furnace is the vent motor which should be running, the pressure switch that tells the board the vent motor is running, the hot surface igniter, or the condensate drain is plugged.
The vent motors can seize up over the summer when not in use.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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