more info here in its path. The sensor for the furnace is either faulty or coated in dust and needs replacement.In general, addressing short-cycling is important to stop these consequences and make sure the optimal Procedure of your HVAC system.If your HVAC isn't earning sound once you flip it off, then there might be a challenge Together with the contactor relay switch. This is certainly a straightforward issue to repair.This can be a warning sound. If it (or an analogous seem) is coming from your AC compressor, you need to act promptly and turn electrical power for the unit OFF. It'd change off By itself—that is very click to investigate good. Depart it on your own till you can get assistance.