If you are referring to the supply fan in the furnace unit in the garage, I would check two things. One, look at the electric panel to see if the circuit breaker is tripped. Two, check to see if the condensate line in the furnace room is clogged. If it is, the condensate drain pan will fill up with water and a float switch will prevent the fan from running. If you can unclog the condensate drain, it should start working. The only other thing I can suggest is to call Munn's because they can probably come out tomorrow. Good luck.
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