I performed a comprehensive maintenance check on the furnace, starting with a thorough inspection of the electrical components. I measured the amperage to ensure the system was operating within safe limits. Next, I meticulously cleaned the sensors to remove any dust or debris that could interfere with accurate readings. I also examined the burners, heat exchanger, and air flow pathways to confirm they were free of obstructions. After cleaning, I tested the furnace's ignition system and thermostat functionality to ensure they responded correctly. Finally, I verified that all safety mechanisms were operational, confirming the furnace was performing as intended by the manufacturer.