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Found lp American standard gas furnace locking out on a code 3 pressure switch error code. When you remove the 3†intake pressure switch code went away and furnace will ignite. Used a borescope camera and could not see what was in the pipe. Used a shop vac and tried to pull a vacuum ethier way to vacuum out what is in the pipe. Was not able to remove the clogg vent pipes are in drywall. Furnace is working fine without the intake connected. Talked to homeowner about issue and is ok with solution does not want to cut drywall at this point.