Air Conditioning - A/C Unit is flooding itself

Hi, I have a new Horizontal air handler in my attic that was installed last year. (heat is by a boiler unit- thats why a separate a/c). (Goodman unit, 2.5ton) This year i noticed that the "emergency" drip tray under the airhandler/A coil is filling up with water. I checked the 1 inch PVC drain line and it seems fine- although- its possible the downward pitch isnt that great for the first 10 feet of PVC. I also noticed the drain pan inside the airhandler has about 1/4 inch of water in it, but the bottom of the airhandler is soaked. Should this drain pan be emptying out completley all the time? Or is it possible the CFM is to much on the unit to where water isnt dropping off the Acoil, but is being sucked into the blower, etc. I know just enough to get myself in trouble on this- and im hoping to fix myself without a service call. any thoughts? thx! dan

On most air handler, there should be a trap.. The trap needs water to keep the air from sucking into the air handler..

Take a shop vac and suck on tne end of the drain outside and see if pulls anything..

There should be NO water in the pan under the air handler..