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Hello,My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.
I apologize for the delay....do you still need help?
Ok first thing...all all the intake air vents around the case open and not blocked?
and is the vent pipe clear?...no nest, birds, rodents or leaves/debris?
I am sorry but did you get my question about the vent pipe being clear and air intakes open?
Hello, alternating error codes often point to a bad printed circuit board, tell me about how old the furnace is....examine the printed circuit card for signs of corrosion, or over heated spots. We can go from there.