Close this search box.


AC Unit Buzzing Every Few Minutes

You may wonder if the noisy sounds coming from your AC unit are typical if you’ve recently started hearing them. Air conditioner repair may be necessary if you listen to sounds except the standard humming from the inside air handler or outdoor unit.

Suppose your air conditioner is making loud, high-pitched noises like screeching, pounding, clicking, buzzing, hissing, rattling, or any other loud sound. In that case, it must be replaced or fixed. These sounds occur due to different components, including the fan motor, blower fan, condenser fan, fan belt, expansion valve, relay switch, compressor, refrigerant pipe, and so on.

This summer, keep an ear out for any disturbing noises from your central air conditioner, both inside and outside, such as screeching, buzzing, rattling, hissing, or slamming.

Suppose your air conditioning unit has been making a strange, high-pitched buzzing sound recently. In that case, you may wonder what may be causing it. It’s unnerving the first time you hear it.

The volume and pitch are so loud that they’ll keep you up all night. What is it? What does it mean? Continue reading this page to know the complete information.

What’s the Most Common Cause of Air Conditioners Making Different Noises?

Depending on your air conditioner type, modern HVAC equipment use sound-dampening technology to keep noise levels between 25 and 55 decibels. Twenty-five decibels is a whisper, and 55 dB is a typical home conversation. The latest window and mini-split ductless ACs are quieter than central ducted systems.

Any AC making unusually loud and unexpected noises is either malfunctioning or needs expert attention. Air conditioner noises, though bothersome, might alert you to a problem before it becomes too expensive or impossible to remedy, such as a fan motor or compressor.

Know what each noise means because different issues can generate the same sound. Many households complain about a buzzing air conditioner. When a device makes a loud noise, the first step is to locate the source. Test and replace the component when you detect the noise source.

To help you troubleshoot the next time your AC makes a noise, we’ve created an extensive list of AC noises and their causes. Your air conditioner is malfunctioning if it makes an unusual sound. Depending on the sound, you can diagnose your system.

1. Squealing Sounds

A misplaced or worn belt connecting the motor and blower is most likely the cause of your AC making a squealing noise when you turn on the fan, heater, or air conditioner. Even if the noise fades in and out periodically, it will be there all the time.

2. Screeching Noise

The fan motor bearings in your condenser unit are likely to blame for the screeching metal-on-metal sound that occurs when you switch on your air conditioner. Moving parts of the fan motor rubbing against one another as the bearings wear out can produce noise.

3. Humming Sounds

Humming sounds are only one of many AC sounds that might indicate various problems. Although the average homeowner can fix some HVAC issues, others will need the attention of a professional.

4. A Disturbing Buzzing Sound

Several potential causes exist for a buzzing sound coming from your air conditioner. Suppose your AC unit is making a buzzing noise. It may be trying to power on a faulty part or frozen over because of a refrigerant gas leak.

5. Clacking and Banging Noises

Suppose your device makes clanking and banging noises, in that case, it likely has a loose part floating about inside and crashing into other components. You’ll need to replace your compressor if the worst-case scenario plays out.

If your fan is making this noise, it may be because it is out of balance and hitting against other components. If left unchecked, these issues might snowball into much larger ones.

6. Clicking Noises

You may hear a brief clicking sound when you power the device on or off. It’s the beep and whirr of various electronic devices powering on and off. If your thermostat keeps clicking after a few minutes, it may be faulty.

You’ll need to be vigilant to determine what’s causing the clicking. Issues with the electricity in your home are delicate.

7. Rattling Noises

The rattling sound usually means it’s time to replace your air conditioner. Loose components are the root source of the disturbance when this occurs. The noise may be the result of the electrician doing work nearby. If this is the case, it will damage the unit’s compressor and other components. A misbehaving fan blade can sometimes be the offender. You could have an issue with your outdoor unit due to debris like leaves and twigs. Whatever it is, you should begin by checking the casing for any loosened screws. Maintaining your air conditioner properly includes changing the air filter and cleaning the condenser coils.

The Reasons Why You Shouldn’t Ignore Air Conditioner Noises

When your air conditioner starts producing strange noises or a peculiar odor, it is trying to alert you to a problem. If you ignore weird HVAC noises, a minor issue could become a major one, compromising the system’s performance and requiring expensive repairs.

Toxic fumes from leaking refrigerants, audible as a bubbling sound, can be inhaled by humans, so it’s essential to address any noise problems as soon as possible. As a bonus, you can save money by not paying attention to the noise problem. Finding and fixing the source of the noise as soon as possible will have the most significant positive effect on your unit’s efficiency.

Take the time to keep up with your air conditioner with regular maintenance and professional inspections. You can reduce the likelihood of hearing any unsettling noises emanating from it. Even so, if you run into this kind of problem, tracking it down as quickly as possible is best.

Do You Hear a Buzzing Sound From Your Air Conditioner Every Few Minutes?

The irritating buzzing sound your air conditioner makes every few minutes. There could be several causes for this problem, so it’s essential to investigate your unit thoroughly. A filthy filter or blocked vents are two possible causes.

Faulty wiring and broken components are two more frequent problems that may necessitate an expert’s intervention. It’s also possible that your system is short on refrigerant, which would explain the symptoms you’re experiencing. Lack of this vital cooling ingredient, which keeps the system at a steady temperature, can cause it to generate unsettling noises.

However, if none of these issues are at play, your device probably needs maintenance. Keeping up with routine cleaning and servicing should significantly extend your air conditioner’s life.

If your air conditioner buzzes, here are several causes and fixes. It’s getting hot outside, so you decide to crank up the air conditioning. Eventually, it begins to make an eerie buzzing sound. The noise escalates even after you’ve ignored it for a while.

Air conditioners that make a buzzing noise every few minutes are a common AC issue. Some appliances, such as window air conditioners, occasionally emit annoying buzzing sounds. Should you be concerned about the humming sound coming from your AC unit?

Almost always, yes. The source of a buzzing sound is one of the most elusive AC noises to identify. There could be several factors contributing to the AC’s blaring buzzing. In general, we can divide them into the following groups:

1. A Buzzing Noise Coming From the Air Conditioner Compressor (Faulty Contactor)

The air conditioner compressor may have intermittent power loss if the contactor or switch is defective. The compressor may start up every few minutes due to electrical jolts in the contactor. The AC unit frequently makes a buzzing noise because the compressor is running.

How to Fix

The first step in troubleshooting is disconnecting the power to the air conditioner so that you may inspect the compressor for physical damage. If you need help determining the problem, it’s better to have an expert take a look and either fix it or replace it.

2. Electrical Problems

The buzzing noise from your air conditioner could result from an electrical problem. A loose cable or damaged circuit board are both possible causes. Low efficiency and potential fire risk are both consequences of electrical issues.

How to Fix

A professional AC repair specialist should be called immediately if other electrical symptoms accompany the humming sound. They can figure out what’s wrong and fix it for you.

3. Contractor Relay Switch Failure

The thermostat communicates with the contactor, a switch on the outdoor unit to activate the high voltage to your outdoor unit’s compressor. When turned on or off, a contactor that has grown worn out over time may make a buzzing sound.

How to Fix

The first step in fixing the problem is disconnecting the electricity to the air conditioner and examining the switch for wear and tear. If the switch appears broken, you should install a new one.

4. Compressor Misconfiguration or Failure

The compressor is responsible for maintaining the correct pressure and temperature in the refrigerant in your unit. The incorrect voltage supplied to the compressor will cause a buzzing noise. Due to wear and tear, You should frequently replace air conditioner compressors.

How to Fix

If your air conditioner is making a buzzing noise but not turning on, and the troubleshooting steps we outlined above have yet to help, you should call a professional to inspect the compressor.

5. Refrigerant Leak

The air conditioner will begin to freeze if freon leaks out of the copper refrigerant pipes. There will be many issues, most notably the recognizable buzzing noise emanating from the interior or outdoor unit. Before adding more freon to the window air conditioner, ensure to fix the leak.

How to Fix

Check for leaks by looking for puddles of water around the unit, which could indicate where the water is getting in. If you suspect a leak, it is best to get it checked out and fixed by a professional HVAC technician.

6. Capacitor Breakdown

The fan relies on a capacitor to supply its power. If the AC capacitor is faulty, the electricity supply to the fan will be interrupted. AC buzzing sounds can occasionally be heard from the interior unit when the capacitor sends a power spike to the fan.

How to Fix

After inspecting your air conditioner, a professional will let you know if you can fix it or if you should get a new one.

7. Unbalanced Fan Blades

The buzzing noise that a broken fan might produce as it spins indicates that it is not in good working order.

How to Fix

Fixing it is as easy as tightening the screws, and your AC will work as it should in no time.

8. Mechanical Cooling System Freezes Up

Since you use your air conditioner, this is a peculiar question. Unfortunately, no subzero conditions can prevent your device from freezing solid. In the event of a refrigerant leak, conditions will become chilly, and your system will buzz.

How to Fix

Thaw the unit if you encounter this noise. It’s easiest to turn it off and let it rest. As a next step, try turning it on at its lowest level to determine if the noise still occurs. If the noise persists, you need to call a technician to fix the equipment.

9. Loose Components

Loose elements can cause air conditioners to rattle or buzz. Due to the AC unit’s constant vibration, these parts may become loose and noisy over time. Loose components increase the risk of a breakdown or reduced performance. Flammable materials and dangling wires are two other risks associated with unsecured components. They need to be repaired immediately for this reason.

How to Fix

If you suspect this is the issue, open the device and look for loose nuts or screws. Once you’ve isolated the offending component, tightening it down can be the answer. If such is the case, you should probably call an expert to look at it and fix it. DIY solutions could make the situation worse.

10. Defective Motor

A broken motor might also cause buzzing. It’s also possible for your air conditioner’s copper lines to buzz due to interference from nearby objects or to rub against one another.

How to Fix

To fix this, make sure the lines are sufficiently insulated and that metal never touches metal.

11. Condenser’s Fan Motor Issues

When your air conditioner operates, the condenser fan pushes cool air from the outdoor unit inside your home. The compressor motor buzzes when it starts to have issues. In such cases, the internal blower may continue to function normally even when the fan blades are not rotating. The lack of rotation in the fan blades may be due to a faulty motor, foreign debris, or a few loose screws.

How to Fix

When this occurs, you should turn off the air conditioner. Then, examine the fan to see if any debris or missing parts prevent it from spinning. If you need help with your heating and cooling system and help figure out what’s wrong, it’s best to call a professional.

12. Isolation Foot Damage

Your unit’s compressor is attached to the base, and the whole thing rests on a tiny rubber foot called an isolation foot. Nonetheless, the foot’s rubber might degrade after repeated use. If the material is broken or damaged, the compressor’s weight distribution will be off, and the device will buzz. If the isolation foot needs replacing to keep the compressor in check, it is best to call in the pros.

How to Fix

Check for cracks or other damage in the isolation footing and fix it if you find it. You should immediately contact an HVAC technician to schedule repairs or replacements if it’s broken.

13. Vibrating Refrigeration Pipes

If you don’t adequately charge the refrigerant lines, vibrations may result. Sometimes a humming noise will be produced by this shaking. However, there are other potential reasons for a vibrating refrigerant line, such as an incorrectly installed expansion valve.

How to Fix

Have a professional look it over and make any necessary repairs.

14. Signs of Debris

Suppose your outside air conditioner generates a buzzing sound indoors. In that case, dirt and dust may have settled on the condenser coils. The wind blows leaves and twigs into the coil holes and sometimes even further within the machine.

How to Fix

Have a qualified technician open the unit carefully if you fear debris has made its way inside. Before using water and coil foam cleaner, however, you should use a small-handled broom to remove any loose material and thoroughly clean the coils. Keeping the coils clean will help prevent this from happening again.

How Do I Fix the AC Unit’s Buzzing?

When your air conditioner starts making a humming noise, you must check that something is likely off. Finding the source of the noise is vital due to the factors above. Your home’s central air conditioning and heating system function as a single device. For the air conditioner to function correctly, it requires a certain amount of airflow. The blower motor (housed within the furnace) is responsible for circulating air through the entire system, including the air filter, to heat or cool the residence. The condenser unit outside your home can stop working if the air filter is clogged or the blower motor stops working.

To fix the humming noise from your air conditioner, you need a professional expert to check out the system. Never try to do this yourself; only a qualified professional should attempt this kind of work. The refrigerants in your HVAC system are potentially dangerous. Therefore only a trained technician should handle them. Because of the risk of electrocution, only a trained professional should ever make changes to your system’s electrical components. Suppose a homeowner hears a strange humming, whirring, or buzzing coming from their HVAC system. In that case, they should contact a professional service to check and repair it.

Having problems with your furnace’s blower motor could signify that the unit is reaching the end of its useful life. The motor that powers the blower rarely breaks and needs to be replaced.

A professional service will not only evaluate your HVAC system thoroughly. Still, it will also diagnose the problem and offer solutions to get things back to normal as quickly as possible. Suppose you decide it is in your best interest to replace your unit. In that case, they provide financing plans that make that possible, along with low-cost replacement options that ensure quality.

Is It Time to Replace That Noisy Air Conditioner?

It may be time to consider a replacement if your unit is on the older side. HVAC systems typically last 10–15 years.

It may be shorter or longer based on the unit design, climate, and inspection intervals. However, a significant amount of noise from an older machine usually indicates degradation. A new air conditioner is an investment that will likely pay for itself in less noise and reduced energy consumption.

Last Words 

Because of how much you rely on your air conditioner to get you through the summer, any unusual or excessively loud noises can be very unsettling.

If you ignore your AC’s strange noises, they could turn into expensive repairs down the road. These sounds could mean that your air conditioner needs anything from a simple tune-up to extensive repairs or replacements.

You shouldn’t neglect the significance of a buzzing noise from your HVAC unit. A frozen unit, a broken condenser fan motor, broken isolation feet, a broken compressor, or a few loose parts are all possible reasons. Hiring air conditioning experts to fix your AC is the most incredible method to guarantee optimal performance and extended life, maximizing your comfort at home.

There’s no point in speculating about the source of the AC’s noise before servicing it. However, ignoring it could lead to the failure of more expensive parts. An air conditioner repair can be expensive, but a home warranty can help.

Leave a Reply

Your email address will not be published. Required fields are marked *