If your furnace goes out in the middle of a frigid day, you may want to try to repair it yourself rather than waiting on a furnace repair technician. Many furnace repairs aren’t difficult, but determining what is wrong can be a struggle for novice DIYers. If you have some experience working with furnaces, you may be able to handle the most common furnace repairs, including the one described in the video below. Video Source In the video, the HVAC technician shows the most common furnace problem. He says that the most common reason for furnaces to stop working is…