Air conditioners tend to make strange noises when they get older and start going bad. Understanding what these sounds mean can help you know when to consider a replacement.
Banging, Rattling or Clanking
When your air conditioner starts making banging, rattling or clanking sounds, it’s usually a sign of a loose or damaged component within the compressor. It could also be the result of a loose or broken connecting rod, piston pin or crankshaft. Another possible cause of these noises is an unbalanced blade that comes into contact with other parts of the indoor blower or outdoor fan.
Buzzing
Electrical issues, including frayed wires or a faulty circuit breaker, are the most common causes of buzzing noises. It’s also possible that you’re hearing noise and friction caused by malfunctioning motor bearings. Or it might be a dirty condenser coil or debris in the outside unit. An HVAC expert will use helpful tools like a multimeter to pinpoint the exact location of the buzzing noise.
Even though refrigerant issues don’t normally produce buzzing noises of any sort, dripping refrigerant can still be the cause of them. This is sometimes apparent when low refrigerant levels cause ice to form on the evaporator coils. As the ice melts and drips onto nearby components, it can produce a buzzing noise.
Clicking
A clicking sound is typical when the device turns on and off, but if it happens too often or constantly, there could be a problem. Most of the time, clicking noises are the result of an electrical issue. If the clicking sound persists, it might be a sign of a control panel malfunction or a problem with the relays. Another possible cause is a broken thermostat.
Hissing
When an air conditioner makes a hissing sound, it usually means there’s a refrigerant leak. There’s a good chance the leak is the result of a hole or fracture in the coils. You might also hear a hissing noise if there’s a potentially harmful buildup of pressure in the compressor. Alternatively, an internal valve that isn’t working properly or an expansion valve that isn’t doing its job correctly might cause a hissing sound. In addition to reducing cooling effectiveness, refrigerant leaks are harmful to the environment and human health and require immediate attention.
Screeching or Squealing
When an AC unit makes a screeching or squealing sound, it’s usually because of a worn-out fan belt or motor. This happens as a result of misalignment or wear on the belt, causing it to slide or scrape against other components. Problems with the motor’s bearings, which generate noise and friction, are another potential source of screeching or squealing. Ignoring these issues can cause the motor or belt to break down entirely.
Thumping
When an air conditioner makes a thumping sound, it’s typically because of a problem with the fan or blower component. If there’s anything blocking the airflow or the fan blades aren’t balanced, you’ll hear this noise. Loose components that shift around when the system is operating are another potential source of thumping. Over time, the internal components will eventually suffer more severe damage as a result of this erratic motion. Preventing further system wear and tear requires prompt action to resolve the pounding sounds.
Whistling
Air conditioners that make a whistling sound usually have problems with the airflow. This happens when there are holes or cracks in the ducting, which allow air to escape and make a whistling sound. Clogged filters or blocked vents may also contribute to this noise because they limit airflow and cause internal pressure to rise. Whistling can be an additional warning sign that the blower isn’t distributing air evenly. The air conditioner’s performance and efficiency will suffer as a result. Fixing the whistling noise and making the system work better is as simple as making sure air can flow freely and fixing any leaks. This is why it’s wise to do a regular tour of your house and remove any obstructions, such as curtains or furniture, from the vents to ensure proper airflow.
What to Do
If you notice strange noises coming from the AC, you should switch the unit off and call a professional immediately. Disregarding these noises could lead to more harm, less effectiveness and higher energy costs. HVAC experts use specialized equipment and technologies to identify the problem, fix it and ensure that the system is safe and efficient to use.
By keeping up with routine maintenance, you can avoid a lot of these issues and extend the unit’s life. If you want to keep your system from overworking and hear less rattling and buzzing, you need to change or clean the air filters often. To avoid clanking and thumping noises produced by imbalances or obstacles, it helps to clear the area surrounding the outside unit and make sure it’s level. You can also try checking the ductwork for leaks or weak connections and tightening any screws that may be rattling.
The best thing you can do is schedule regular professional maintenance. Technicians will check and clean the system’s coils, fins and condensate drains to prevent the buildup of debris that might generate noise. To keep belts and motors from wearing down and making sounds like buzzing or screeching, they adjust electrical connections and lubricate moving components. They’ll check the refrigerant level and balance the unit if they notice any clanking or hissing noises.
Other Signs of a Bad Air Conditioner
Certain noises may indicate that your AC is going bad and you need to install a new unit. Some, however, may indicate a small problem that doesn’t require a full upgrade. Fortunately, you can look for other signs to help you decide whether a full replacement is necessary.
The Unit Constantly Needs Repair
Incessant malfunctions indicate that the system is getting close to its end of life and that its parts are wearing out. The expense of repairs might soon exceed that of a brand new, more efficient device.
The Unit Is Over 15 Years Old
Older units, those that are more than 15 years old, are more likely to be inefficient and have more frequent breakdowns. You’ll likely improve cooling, reduce energy costs and increase reliability by upgrading to a newer model.
Your Cooling Bills Keep Going Up
Units often need more power to maintain the set temperature as they get older. Possible causes of this inefficiency include decreasing refrigerant levels, the accumulation of dirt and debris or worn-out components. Newer versions provide improved performance at a more affordable price point thanks to their more advanced technologies.
Your Home Doesn’t Cool Like You Prefer
As systems get older, they tend to experience problems with their compressors, refrigerant and airflow. All of these problems can lead to uneven cooling and an uncomfortable living space. Upgrading to a new model will provide adequate cooling that you can rely on.
Erica's Plumbing, Air Conditioning & Restoration is here to help you figure out why your AC is making strange noises. We also help Coral Springs and other Palm Beach, Florida homeowners with sump pump installations, water leak detection, drain cleaning and mold, water and fire restoration in addition to our installation, repair and maintenance HVAC services. Give us a call today to schedule an appointment to fix your noisy AC.
