It can be disappointing to return home on a chilly day only to find your furnace not turning on. Furthermore, this may happen late at night, leaving you with indoor discomfort as you wait to schedule repairs. More importantly, note that trying to diagnose your unit for defects can result in more issues, and it is best to wait for a furnace repair expert to attend to the problem. They will inspect your heating unit and remedy the underlying malfunction for peak performance.