4 Causes of a Ductless System’s Noisy Operation

September 17, 2023

Under normal circumstances, your ductless air conditioner should run smoothly with minimal noise. However, there may be underlying issues if you detect a sudden increase in noise levels from the system. Here are four common causes of strange sounds from a ductless system in Myrtle Beach, SC, and what they mean:

Rattling Noise

A rattling noise often indicates loose parts within your ductless system. This could be due to the system’s screws or fasteners coming undone over time, or a part inside it could be out of place. To reduce the noise, your service techs should check all screws and fasteners for tightness, replace any old parts and ensure your air filter is clean.

Squealing Noise

A squealing or whining sound from your ductless AC system may indicate a malfunctioning fan motor or a worn-out belt. As these components strain or get close to breaking, they can emit a high-pitched noise, alerting you to impending failure. The strain also places added pressure on the system, increasing energy consumption and shortening its lifespan.

Whirring or Humming Noise

A whirring or humming noise often emanates from a faulty compressor motor. If the internal motor isn’t operating correctly, it can produce a loud whirring sound when running. Sometimes, this issue may be due to a lack of lubrication or an airflow obstruction.

Banging Noise

Loose or off-balance fan blades can interfere with the system’s normal operation, leading to a thud-like sound whenever they come into contact with other parts inside. The banging noise gets louder as the blades wear down, so addressing this issue is important to avoid further damage.

Your ductless air conditioning system is complex; whenever there’s an issue, it can cause strange sounds. Contact Warren-Hay Mechanical for HVAC maintenance if you notice any of these noises from your ductless AC system. Our experienced service techs will inspect your system to determine the source of the sound and complete any necessary HVAC repairs.

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