your drain is plugged up.you have to figure out where it is plugged.once u find this out,then you simply clean it out.i like to clean my a/c out before ever installing it.take what covers you can get ,off.spay out with a garden hose.clean the condensor and the evaporator.try not to spray the control box,on anything elecrical.clean the filters.let dry out.tilt unit to drain excess water.you should have a good a/c unit to run all season.just remember use common sense when doing this.if your not comfortable doing it,find someone who can.
RT, June 2010