Arrived at the home to preform a blue shield club maintenance. Was greeted at the front door by the customer and I was shown where the thermostat was located. The customer stated the heater seemed to be working fine to his knowledge. While preforming the maintenance I checked out all aspects of the furnace. Checked the blower motor, induce draft motor, all safeties, capacitor, gas valve, pulled and cleaned the flame sensor, checked igniter for proper ohms and operation, pressure switch, pressure switch hoses, 90% drains, evaporator coil for cleanliness, blower wheel for cleanliness and proper balance. Overall system is in great working condition with no repairs needed on the system.