I had problems with my furnace twice so far during the -30 weather due to frosted up vents. Your vents are nothing compared to what mine were like. The exhaust vent had a frostcicle sticking out about 3 inches and there was only about a 1" gap left for the exhaust to escape. Once I cleared that the furnace worked fine. I currently have one panel off of my furnace so it'll work. I think that the intake vent started to get plugged up and it couldn't get enough air. New high efficiency furnace installed in 2013.
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