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Most modern air conditioners are equipped with the latest noise dampening technologies.

Depending on the model, ACs produce anywhere between 25 and 55 dB, meaning you don’t have to worry about your eardrums getting hammered. But if the unit is suddenly making a particular noise, it may be due to an underlying problem.

That’s why we thought of making you aware of the 6 most common noises that an AC may make and how to stop them. Dive in!

6 Sounds That Your Air Conditioner May Make And How To Fix Them

1. Hissing 

The chances of a snake entering your air conditioning system are not completely zero. But if you’re sure that it’s not a slithery guest who has made your AC their home, then the hissing sound is likely originating from a duct leak. 

Although most such leaks tend to appear harmless initially, it’s only a matter of time before they cause more trouble. Alternatively, it can also be caused by the expansion valve malfunctioning or an incompatible or malfunctioning air filter. Either way, we’d strongly recommend calling professionals who will thoroughly inspect the system and provide you with the right solution.

2. Screeching

A screeching sound (similar to that of a bat “screaming” inside your AC) can have several reasons. You may hear a screeching noise as soon as you turn on the unit if there’s something wrong with the condenser fan.

For instance, the noise can result from a malfunctioning or damaged motor or if the metal bearings of the fan have come loose. In this case, you can go through the instruction manual to understand how to take off the motor (or the bearings) for replacement.

Aside from that, some old models of ducted or central ACs employ a belt for connecting the fan to the motor, which can wear down with regular use. The belt may expand and contract in high temperatures, which may also cause this noise. This problem can usually be solved by replacing it altogether- a job best left to professionals!

Likewise, the accumulation of high pressure inside the system can cause the screeching sound and keeping the unit turned on for too long can even result in a fatal explosion. So, switch off the AC immediately and call qualified professionals.

3. Buzzing 

If you hear a buzzing sound coming from your air conditioner when it’s running, then it’s probably caused by some loose vibrating parts. On the other hand, a faulty compressor that continues to circulate electricity even after the power has been shut off can be one of the primary reasons behind this buzzing sound.

Other causes include a broken down capacitor, malfunctioning compressor motor, obstructions to the copper lines connected to the AC, or the copper lines coming in contact with each other. 

Additionally, any minor or major fault in the contractor (responsible for controlling the electric flow to the AC) can present itself through a buzzing sound. Similarly, loose wires dangling around the AC can cause this sound when the power is switched on.

Lastly, extremely low temperatures or low levels of refrigerant can cause some of the internal parts to freeze, and they may vibrate when the AC is running. While the other issues should be resolved with the help of professionals, you can keep the copper lines safe with proper foam or rubber insulation.

4. Banging 

Although intense banging sounds are mostly related to severe compressor or fan moto problemsr, the issue may not be very serious from the get-go. 

Sometimes, dry leaves, twigs, dirt and debris stuck in the condenser can cause this sound, especially if the exterior unit isn’t cleaned regularly and is surrounded by trees or shrubs. Simply remove the condenser cover and eliminate any foreign object to stop the noise. 

Likewise, loose screws vibrating inside or outside the unit can also trigger these sounds. All you need to do is tighten them to resolve the issue.

That said, we aren’t denying that some banging sounds originating from inside the unit can indicate a bigger problem, like a broken fan motor or malfunctioning compressor. Both these parts can be tricky to handle and should be replaced or repaired by qualified professionals.

5. Pulsating Or Throbbing 

Some pulsating or throbbing noise coming from your AC might not necessarily indicate immediate danger. However, you should be extra careful if the sound becomes rhythmic or frequent.

One of the most common reasons behind this noise is a loose coil or fan blade, which vibrates and comes in contact with the other parts of the system. This can be easily resolved by tightening the screws that hold them in place.

Many homeowners who have a plastic base to support their air conditioners often complain of this sound, which is actually caused when the system vibrates while running. If you too face the same problem, we’d suggest replacing the plastic base with a wooden one or employing rubber padding on the machine’s edges.

Moreover, you may hear this sound if the refrigerant line of your AC is touching its walls. Here again, you can use some insulating material to prevent the line from coming in contact with other surfaces.

6. Clicking

If you hear a persistent clicking sound when the unit is running, then it’s a definite indication of a faulty thermostat. Since repairing or replacing one is complicated, we’d strongly recommend calling the professionals.

Final Words on Air Conditioner Noises

Working with any electrical appliancerequiresr complete knowledge and utmost safety,soy we’d suggest calling only the best air con repairs Adelaide

service. And make sure you have their emergency contact so that you can resolve the issue at the earliest.

But if you want to inspect the unit or are confident about carrying out minor repairs, always ensure that the unit is switched off and disconnected from its power source.

We will see you next time. Take care!