if it is a power vented unit then there will be 1 or 2 pressure switches that determine if the vent is venting properly, one of the most common problems is a blocked condensate drain that allows water to backup in the pipe causing a blockage in the vent which causes the unit to shut down, in this case, the unit ussually starts briefly and then shuts down
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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