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Originally Posted by wmproop

call someone ,,spend your money,we need answers to help you
when you go to the docter,you pay him ,and he asks you what is wrong with you. we need a little ifo. in order to help you

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Read my whole question all the info is there

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Originally Posted by DB414

I know that and it is number 31 and that suggests like 10 different things, would it be easier if I named them to you

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31 means the pressure switch isn't closing or (in your case) is re-opening during a heating cycle. I would be willing to bet you have a clogged condensate trap or condensate accumulation in the exhaust vent because of a sag in a horizontal section, based on your description of the brief heating cycles and the fault code given. I'm not sure what you are expecting, but a pro would check "like 10 different things" if the service label lists them. There is only so much we can do for you with a mouse and a keyboard; but still, we are trying.