Colfax California AC heating service AC heating maintenance AC heating diagnostic heating maintenance. Visual inspection of electrical (good) no burnt or overheated wire connections, inspection of electronics found main circuit board showing some wear cracking solder joints. possible intermittent problems or failure of heater can occur from this finding. blower motor capacitor 10uf test at 8.4uf capacitor test out of mfg tolerance of 6% recommend replacement. This could cause blower motor failure due to additional stress. Tested amp draws (good), Flame sensor reading 2.8 (good) Burners clean, Heater safeties good, Gas pressure 10.27 good, ohms reading of hot surface igniter 83.1 good. system working at this time. changed air filter. Visual inspection of ductwork good no broken or disconnected ducts AC maintenance wire inspection (good), contactor with slight pitting and burning on contact points, capacitor 55/5 reads 54.9/5 (good) Checked / Tightened all wire connections. amp