Unit was not running when I arrived. Found a blown 3 amp fuse. This system is extremely old r22 system. Also over sized furnace inside. I filter in the return was completely compacted and was no allowing air flow. I replaced 3amp fuse with no filter and system ran fine. I replaced with a 20x25x1 filter an ran the system for close to 45 mins and dropped 5 degrees. If there is future problem we are going to need to look into replacing and getting the right size for this building.