Today I arrived on site and performed a winter time maintenance on your HVAC equipment. Indoor Unit (Garage, 1st Floor Area): Replaced the air filter (20x20x1). Customer provided the spare filter. Checked the filtration. Observed the indoor coil in fair condition. Outdoor Unit (Side of House): Observed the outdoor coil in fair condition. Electrical Components: Tested and inspected the blower motor, compressor, condenser fan motor, blower run capacitor, compressor run capacitor, fan run capacitor, compressor start capacitor, contactor, and electrical wiring. All components are working properly within manufacturer's specifications. System Components: Inspected the blower wheel, burners, primary drain pan, secondary drain pan, and secured electrical wires. All components are in good condition and working properly. System Performance: Measured a return air temperature of 69.0°F and a supply air temperature of 50.0°F. Cleared the condensate drain line. Noted the safety switch is faulty