System was not cooling due to float switch tripping. Water keeps backing up into drain pan and filling up float switch cup because of high static pressure. Getting a total of .71 static pressure between supply and return, the minute air filter is removed static pressure drops to .5, air filter, very dirty and very restrictive. Replace filter with a Merv five air filter to have less airflow restriction. Tested drain with water and flushed completely out. Cycled and tested system, all operations OK at this time.