Hot water down the condensate line once a month. Also, I had a neighbor a few years ago who had his condensate line get clogged up. The Munns tech found a rather large, dead, anole stuck in the line. After hearing that, I put stainless steel mesh strainers on the ends of the condensate lines outside the house. These are actually made for live wells in fishing boats, but work well for this purpose, too. Keeps small critters out.
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