If you’re reading this, it’s probably not because you heard a few clicking sounds from the furnace when it started up. That sound is normal: it’s the ignition starting on the furnace, and it’s no reason to be alarmed. But the furnace shouldn’t be making clicking noises at other times, or clicking consistently or loudly. This is one of the most common warning signs that a furnace has a malfunction and needs attention from repair pros.
There are several possible sources for these clicking sounds, and this is one reason professionals are always essential for handling repairs. Only trained HVAC experts can accurately diagnose the problem so it can be properly fixed. The list below will give you an idea of what to expect, but please don’t use it to attempt a DIY repair—that can be dangerous!