Upon inspection, the furnace was tripping on its limit switch due to restricted airflow. I began by examining the floor return and discovered a clogged filter, which I promptly removed to restore proper airflow. Additionally, I identified that the main trunk line for the basement required more supply vents. To address this, I cut in two 4x10 supply vents, enhancing the distribution of air throughout the area. I also advised the customer on filter usage, recommending they switch from MERV 11 to MERV 8 filters unless the filter rack is upgraded to accommodate larger filters. This change will help prevent future clogging and ensure efficient furnace operation.
