I have a unit that is installed in the attic and is about 10 years old. My problem is I normally have to go up and empty the drain pan every month or so, but lately it's been every 3 days.
I have cleaned out the drain pipe, poured bleach in it and still no luck. I have checked the outside drain and nothing. It seems to be just draining in the overflow pan under the unit which is a pain because it fills up and hits the overflow switch then I'm back up in the attic with the old ShopVac.
What is my next step? I really don't want to call a repair guy cause of the cost but I am stumped at this point.