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Comfortmaker errors I have a comfortmaker model C9MPD125L20B1 furnace. The only way I can get it through a heating cycle is to leave the door off of the combustion compartment (I have disconnected the combustion air line to check that the line is not plugged). For this test I have left the combustion air line disconnected. When the unit fails I get a 6+2 error or a 6+3 error. The condensation lines are open to a bucket for this test. I have replaced the switches with no luck. What else can I check?

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Have you checked the combustion air intake pipe for plugging, possibly a bird or something has gotten in and also check the flue vent pipe for any sags or low spots where condensate can collect and partially restruct the flue gases. If you have someone start the heating cycle with the furnace completely assembled, you can check the intake from the outside where it goes through the wall. It should have a fair pull when you put your hand near it. The exhaust pipe should blow fairly well as well. Then check the pipes along the entire length, if the exhaust is partially plugged with condensate, you may hear the gurgling noise.

Posted on Nov 04, 2009

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