upon arrival tech found secondary pan full of water, tech noticed p trap was dry tech flushed lots of water in drain pan to ensure no cracks visually inspected. System drained with no issues tech suspects water backed up due to vacuum being pulled from drain line due to it being dry. Tech cleared drain pan ensure all float switches are operating properly, recommend ESA for systems customer approved system is now back cooling at this time. Tech locked house and put key back on ring.