2 system Homecare. Flushed drain line added clean out ts and enzymes. Cleaned drain pumps. Visually inspected equipment, checked refrigerant levels, changed main floor filter, checked electrical components and safeties. Cleaned flame sensor. Found upstairs unit to have had high limit removed from circuit and heat exchanger cracked. Due to missing safety and crack did not test heat upstairs. Manufacturer stated heat exchanger no longer available. Informed customer of findings advised not to operate heat upstairs and left thermostat in non heating position. Upstairs unit lacks proper flood protection. Found main floor system to have weak capacitor, high in rush amp draw, dirty ac, dirty filter, exposed electrical whip and minimal flood protection. Added flood protection, replaced whip, capacitor and added superboost. Replaced filter and cleaned ac. Tested system. System operating at this time. Customer agreed to get upstairs unit replaced next Tuesday.