For the life of me, I cannot figure this out. My air handler and heat pump were installed in 2006 and work great. For the first summer since I've owned the home, condensation started to not drain properly and is leaking onto the filter and onto the basement floor. The inside of this handler is spotless, including the drain pan. I took apart the PVC pipe and cleaned it out well, although I don't think it needed it. I still have major dripping!
It does not look to me like it should be overflowing. It pours out of the hole circled below and then onto the floor and back into the unit and onto the filter. If it is coming out of this hole, why is it not going down the correct outlet to the pipe?!
The only change point I can think of is that I purchased a box of filters on the web that had a pretty high MERV rating of 12. The fan seems to push air through it pretty easily, but I am wondering if this is somehow producing a vacuum that is not letting the water drain correctly. I removed the plugs pointed out below by the arrows to try and relieve this vacuum, but it did not work. Any thought or advice?
Last night, I cracked open a cold one and just watched in the basement. I can here the water build up in the pan as it makes this gurgling sound like some force is preventing it from draining, but it is on the verge of overflowing. Once the blower stops, all the water drains quickly. Some down the pipe, some out of the that hole. If the water is building up, I simply don't understand why it won't drain down the pipe.
The water also drained when I removed the filter and left the cover off while the blower was running.