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Do you have a volt meter to see if we are getting power to the vent motor.The furnace will not light until vent motor comes on and closes the pressure switch
Lets start there. Power furnace off and then on to reset bUnplug wires at vent motor and check for 120v between the wires coming from board when you call for heat.
Nothing else will happen until it does.Below is a video showing how to check for power to motor