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When your air conditioner turns on, you will likely hear a faint blowing sound as it pushes cool air through the vents. However, other sounds could mean the unit is malfunctioning, requiring prompt air conditioning repair to prevent a full breakdown. If you’re worried about strange noises from the HVAC system, below are several frequent sounds and potential causes for each. 

What Sounds Can an Air Conditioner Produce?

1. Clanking

A banging, clanking, or rattling noise is often a sign that the internal mounts holding the compressor are loose. Without prompt attention, the compressor can detach and hit other components, causing further damage. Alternatively, a broken fan motor or loose bolts, twigs, and leaves inside the unit could get stuck in the compressor fan and rattle around when the blades spin. An air conditioning repair specialist can open the unit to diagnose and fix the cause.

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2. Hissing

Occasionally, hissing is normal if it only lasts for a few seconds, as this occurs when air moves through the ductwork and expansion valve. However, persistent hissing could be due to a refrigerant leak, internal valve leak, or compressor problem. With all of these issues, the refrigerant that cools the air can escape the closed system, preventing your unit from cooling the air.

3. High-Pitched Noise

A shrill, unpleasant sound has several potential sources, such as a worn fan motor, faulty bearings, or a damaged belt. When diagnosing this issue, look for signs of excess friction in the device and apply small amounts of lubricant to trouble spots. If the noise persists, you'll likely need professional air conditioning repair, as the device needs new parts. Avoid doing this yourself because you may void the warranty on the unit if it is new. 

4. Buzzing

A buzzing unit can indicate a variety of problems. For example, you may have a defective contactor, loose fan blades, bad capacitor, or electrical problems. Given the long list of potential causes, it is challenging to pinpoint the source of the noise, especially if it is coming from a loose electrical connection. This requires immediate attention as many potential issues could cause further damage to the unit, preventing it from cooling the air and leaving the home uncomfortable.

 

If you’re frustrated with strange sounds coming from your AC unit, contact Lenox Heating & Cooling in Chillicothe, OH. These air conditioning repair professionals will perform a thorough inspection and recommend effective solutions. They have a reputation throughout Ross County for reliable, efficient service, offering everything from furnace repairs to geothermal heat installations. Call (740) 702-2665 to schedule an appointment.

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