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[QUOTE=rcandlish;1405859]I am having trouble with my weathermakerm 8000 gas furnace. I have read of other people having the same problem of the furnace turning on and off and have discovered that I...

Take out the flame sensor clean it with sand paper and put it back.see if it works I had the same ptoblem my problem was solved but on other fourms I heard that code 31 is for pressure switch.I have...