Loud Clicking, Buzzing, or Humming From a Mini-Split Is a Sign of Electrical or Control Failure

Mini-split systems are a popular option for home HVAC systems, often chosen for their whisper-quiet operation. Other than the slight whooshing noise of air moving through the mini-split units, you shouldn’t be hearing any noises. If you hear a mini-split clicking or buzzing noise, it often indicates a failing electrical component. Getting prompt repair service is necessary to prevent further damage.

The Meaning Behind the Click: Relay and Board Issues

One of the most common noises that indicates a malfunction is clicking. Repeated clicking signals an issue with the relay. This relay is a small electrical switch that’s situated between the thermostat and the higher voltage components of your unit. These include things like your compressor, indoor fan motor, outdoor fan motor, and reversing valve. Its job is to activate when it gets a signal from the thermostat to send a higher voltage to these essential components.

The relay is simply trying to start but continually fails to engage the compressor or the fan motor. If this clicking noise repeatedly happens over and over again, it will eventually fry the unit’s main control board. This is why it’s imperative that you seek out professional assistance when you first notice that there’s an issue.

Buzzing or Humming: Loose Wires and Capacitors

It’s fairly normal for a mini-split unit to produce a low-level humming sound when it’s running. Modern-day mini-splits use inverter-driven compressors. These allow your system to adjust its speed based on your desired temperature setup. This can cause the humming sound to increase or decrease depending on the capacity level of your unit.

However, if your ductless mini-split system seems to be developing a persistently louder buzzing noise, it typically indicates a failing capacitor or a loose electrical connection that’s vibrating. Some other potential causes include contactors and relays.

Electrical humming can lead to short circuits inside your unit that can damage its sensitive inverter technology. If you notice an increasingly louder buzzing noise coming from your mini-split system, it’s worth getting a professional evaluation. You never want to put off getting repairs for this issue, as electrical problems can lead to much bigger issues, like electrical fires.

Mechanical Humming: The Inverter and Fan Motor

Another sign that you need prompt ductless HVAC repair in Akron is that you have a buzzing or humming noise. This tends to indicate a problem with an electrical component, like HVAC control board problems. Mechanical humming typically points to an issue with a compressor or a seized fan motor. The latter tends to happen due to a lack of maintenance.

Sometimes, debris can enter the indoor head of your unit and cause rhythmic humming as it vibrates. It’s also possible to hear a mechanical humming noise when there’s a loose component inside your unit. Things like loose panels, screws, or even mounting brackets can sit and vibrate when your unit is running. It’s always best to have a professional thoroughly evaluate your unit to get to the root cause of the noise.

The Blind & Sons Mini-Split Advantage

Mini-splits are a popular option throughout Akron and Canton due to the vast majority of historic homes that don’t have traditional ductwork. Blind & Sons has a full staff of licensed repair technicians who are specifically trained to do proper diagnostics on the modern-day inverter technology that these ductless systems provide. We can work on all different types of mini-split systems regardless of brand name or model type.

Why You Shouldn’t Ignore the “Buzz”

Far too often, mini-split noises are put off by homeowners who think they’re just a minor hiccup. In reality, many of these small noises can turn into larger issues over just a short amount of time. For example, if you have a small loose wire, it can eventually lead to an electrical fire within your system.

It’s always important to consult a professional to get a proper diagnosis when you experience an issue with your unit. This is the best way to protect your investment and ensure its long-term efficiency and overall longevity. It’s best to remember that mini-splits are designed to be seen but not heard. When you start to hear strange noises coming from them, it’s best to shut them off and have one of our technicians evaluate them.

Contact Blind & Sons to schedule a ductless HVAC repair service today!

FAQs

Whether it’s about mini-split electrical failure signs or getting ductless HVAC repair in Akron, we get a lot of questions from our customers. Below, we’ll address some of the most frequent questions we receive so you can learn more about the topic.