5 Common Problems With High-Efficiency Furnaces - The Spruce
https://www.thespruce.com/repairing-a-high-efficiency-condensing-furnace-1824755
Sep 05, 2021 · The pressure switch can also be tripped by an obstructed exhaust flue gas vent pipe. Similar to an obstructed air intake pipe, check for obstructions such as nests or leaves, but also check for inadequate sloping of the vent pipe, and make sure the exhaust pipe is supported every 5 feet of its horizontal run.
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