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Service tech was just here (thur 12/17). Turns out the pressure switch is OK despite the led 3 flashes code, but the limit switch was tripped. Service tech reset limit switch as that has a manual...

Ducane package unit with gas furnace. Led flashes 3 times which indicates pressure switch stuck closed or open. I unhooked tubing and blew air into it, seems to be working OK, also I disconnected...