I responded to a call for HVAC repair when the system wasn’t heating properly. After inspecting the unit, I found that the heat exchanger was dirty and the flame sensor was corroded. I cleaned both components and checked the blower motor and burner assembly for proper operation. Additionally, I recalibrated the thermostat and tested the system’s airflow to ensure even heat distribution throughout the home. I also inspected the ductwork for any leaks or blockages. After the repair and testing, the furnace is now running efficiently, and the homeowner is satisfied with the restored performance of their heating system.