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What is the best way to check for blocked heat exchanger?
I have a lennox LP gas furnace I was asked to work on in a vacation rental home. The exhaust fumes are bad. Everything I have researched comes back to blocked heat exchanger. I do not have model # for this post . Gas pressure is ok and flame is not effected when blower comes on. Without taking furnace apart, what is the best way to check for blocked heat exchanger (primary or secondary)?