Upon arrival, I began by inspecting the unit to identify any issues. The flame sensor was found to be dirty, which was likely causing operational problems. I carefully cleaned the flame sensor using a fine-bristled brush and a lint-free cloth, ensuring all debris and buildup were removed. After cleaning, I tested the sensor to confirm its functionality. With the sensor clean and operational, I restarted the unit. The system responded positively, indicating that the cleaning had resolved the issue. The unit is now running smoothly and efficiently.