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Hi my name is Robert.....
IF you are talking about the furnace the fan needs to run for the furnace to light off. As soon as you turn the T-stat on and raise the temp the fan should kick on after the fan kicks on it will blow air on a sail switch, once the sail switch closes then it will pass a signal to the circuit board and then it would start sparking.... Hope this helps.... Robert
IF you have more questions or concerns please feel free to contact me... Robert