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3 Mini-Split Noises and What They Mean

September 09, 2021

It’s natural for your heating and cooling equipment to make some noise during standard operation. A mini-split system is no different, despite their unique and compact design. But certain noises may be evidence that a problem is brewing.

Contra Costa Heating & AC would like to help. We’ve provided a few common mini-split noises and what they might mean for your HVAC equipment. As you become more familiar with these sounds, you’ll be better prepared to call for professional help. The sooner a problem is addressed, the more the risk of severe damage is reduced.

1. Rattling/Crackling Noise

These types of noises are frequently metallic, and most often mean something is loose. Since mini-split systems are made up of two or more units, you’ll want to inspect them all. If a bolt is coming free, refastening it may resolve crackling noises. The fan or motor could also be damaged or loose, making noise as it rattles against the rest of the mini-split.

2. Buzzing/Humming

A mini-split buzzing noise is also common. Similar to vibrating or humming, this could be an electrical problem with the outdoor unit’s compressor. When the compressor is humming or buzzing, it’s generally because the system is receiving an unusual number of amps. Unfortunately, electrical problems like these are more difficult to properly diagnose. They are best handled by a certified and insured professional.

Occasionally the mini-split condensate pump naturally produces a similar noise. Some homeowners can use insulating foam to muffle this noise.

3. Hissing/High-Pitched Whistling

A hissing noise is troubling, especially if it’s coming from the indoor unit. Cooling equipment should not produce whistling or other high-pitched noises. The most common cause of these kinds of sound is a refrigerant leak. Sometimes the leak is a result of a loose or cracked valve. But if the coils are damaged, resolving the problem will be more time-consuming. Both the coils and the refrigerant will need to be replaced.

If left alone, a refrigerant leak could be disastrous. It can irreparably harm the compressor, which is usually too much for what mini-split AC repair can manage. An entire unit may have to be replaced, something we want you to avoid whenever possible.

We Offer Fast and Effective Mini-Split Repair in the Bay Area

If your mini-split system is producing a strange or unpleasant noise, don’t hesitate to reach out to a professional technician. The staff at Contra Costa Heating & AC have years of experience diagnosing problems based on the mini-split noises you’ve discussed with us. Our mini-split repair service is prompt and known for reliable solutions. You can trust our technicians to point you toward the best option for the long-term health of your mini-split system.

To learn more, get in touch with a member of our staff. Request an appointment or your free quote by phone at 510-343-9841 today. Before you know it, your mini-split is back to only making the noises it’s supposed to.