No Cool diagnostic found 21 yr airhandler with tripped water safety switch; 20 x 20 x 1 pleated filter was restricted and wet; condensation drain line was clogged, improper design on drain line causing water to back up and shut down system; rebuilt drain line with trap and air vent; cleaned out drain pan and flushed condensation drain line; replaced filter with horse hair washable filter and ran unit to cool for 30mins observing proper flow of water. Replaced 20 x 25 x 1 filter in 9yr Trane airhandler. Three additional Trane airhandlers contain 18 x 28 x 2 pleated filters recently installed. 18 yr 1.5 ton Goodman split heat pump, (2) 7yr 4 ton Trane split heat pump, 6yr 4 to. Trane split heat pump and 8yr 3 ton Trane split heat pump added to Thompson’s Service Partner Plan; no further recommendations at this time.