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hvac dude here. back of your furnace doooor should have a chart what those codes mean. if it is your pressure switch not making, check 2 things. when your furnace is tying to light but failing, take your front combustion air (burner) door off. if it lights now, that means youve got a restiction in the intake pipe. leave, birds nest, ect. dosent light? try to clean your trap. if your furnace is a 90% or more, youll have tubes going down from below the inducer motor to a cannister(trap) before out to the drain. take it off and flush it in the sink. make sure you have it primed with water upon reinstall. hope it helps, rob. ive got to pm you about some other stuff, anyway. rob
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