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took 3 visits but finally got water from return air vents FIXED. take covers off roof air and grill and filter off return ducts. Use your phone to view up the duct and you should see all the way thru. Mine looked OK with just a look at the ends of the duct. But almost completely collapsed in the middle ( VERY LITTLE ) air getting thru. needed to insert piece of 1 inch PVC from each end and the duct opened all the way to the middle. What was happening was the unit was trying to suck air thru the duct and could NOT get enough. In doing so it was sucking air thru the drip pan drain hole not allowing the unit to drain, It sucked enough water to enter the return ducts.
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