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.
Best Answer
Take your shop vac outside and hook it up to the drain line to suck out whatever gunk is in the drain line. If that doesn't work, you can also use an air compressor at the air handler end of the drain line to push out the clog. Or get a helper and do both at the same time.
Once it's running clean, you'll want to flush out the drain line with some bleach. Mix a 1/4 cup of bleach in to 2 liters or a gallon of water, turn off the air handler, and pour the bleach water in to the drain. Let it sit for 15 minutes or so, and pour fresh water in to flush out the bleach.