If your AC suddenly makes odd sounds, you shouldn't ignore the disturbances. Strange noises can be warning signs of both minor and major issues inside the unit. Review this brief guide to learn what the different sounds mean for the system. 

4 Common AC Noises & Their Meanings 

1. Buzzing

Generally, buzzing noises indicate that there's an issue with the electrical components in the unit. You might have a faulty condenser fan motor, a broken contactor relay switch, or loose wiring that's getting jostled as the air conditioner runs. Since electrical problems can pose fire risks, it's critical to have a professional investigate these issues as soon as possible. 

2. High-Pitched Squealing

A loud, high-pitched squeal can signal a problem with the AC's internal pressure. Pressure buildup can occur inside the compressor as it converts the refrigerant into a gas. 

In most cases, compressors have a sensor that will shut off the entire air conditioning unit if the internal pressure gets too high. However, if the sensor doesn't engage, the pressure can reach a dangerous level. Turn the unit off immediately if you hear this high-pitched noise. 

3. Clicking

It's common to hear a clicking sound when the AC turns on or off. However, if you hear this noise while the unit runs, this could signal a relay or electrical control problem. Since these issues involve electrical aspects of the air conditioner, it's wise to schedule an inspection with an HVAC professional to avoid further damage. 

4. Thumping, Rattling, or Banging

These sounds are commonly caused by loose components inside the unit. Small nuts or bolts will rattle, while larger parts, like loose fan blades, will create thumping and banging noises as they move within the appliance. 

Either way, turn off the unit until you can determine the source of the noise. In some cases, assembly motor or blower issues cause the same sounds, so you'll want to ensure that these components are still in good shape. 

The HVAC professionals at Bear Heating & Cooling will quickly and correctly diagnose strange AC sounds. Based in Trumbull County, OH, this company has offered heating and cooling services to residents throughout Mahoning Valley since the 1980s. View their air conditioning services online, or speak with a friendly HVAC expert by calling (330) 545-0743.