List Of Furnace Won T Light Ideas. Web investigate further if you notice that the pilot light is on, but the furnace won’t kick on. Also, make sure the drain pan and air filter are clean, and check your natural gas or oil supply.
Remove any screws and housing that holds the igniter sensor in place. Pilot lights, but the main burner doesn't come on. Web ignition doesn't occur, and the furnace won't go on.
