Troubleshooting an AC That Makes a Clicking Noise
Some air conditioner clicks are simply part of a normal cooling cycle. Others are early warnings that the system is struggling with an electrical connection, moving component, or startup problem. The key is to pay attention to how often the sound occurs and what the AC does immediately afterward. A single click as the system begins cooling is usually expected. Another brief click when the unit shuts down can also be normal. These sounds often come from the thermostat or a relay changing position. Clicking that continues, repeats several times, or happens while the AC fails to start deserves closer attention. Unlike loud grinding or banging, clicking may blend into the background. Many homeowners notice it only at night, when the house becomes quiet and the cooling system starts another cycle. What begins as an occasional sound may gradually become more frequent as an electrical or mechanical part continues to deteriorate. Electrical controls are common sources of clicking. The th...