Performed comprehensive tune-up on two Lennox furnaces (3 and 4 years old). Verified proper function and safety parameters on both units including heat exchangers, combustion analysis, igniters, flame sensors, control boards, blower motors, draft motors, and capacitors - all components in good working condition. Replaced humidifier pad and identified improper wiring causing continuous operation regardless of blower status. Adjusted humidifier setting from 6 to 4 for more appropriate operation and advised client to monitor performance.
