Six Reasons Why Your AC Unit Is Making Loud Noises in Anthem, AZ

Is your AC unit making a loud noise? It’s always concerning when a cooling system produces anything outside its usual low hum.

As a long-serving provider of lasting AC repair services in Anthem, AZ, we at Mountainside Air have helped many address their sound-related HVAC concerns. Learn more about them here.

1. A Frozen Air Conditioner in Anthem

If you notice a persistent buzzing sound, it’s probably from frozen coils caused by restricted airflow. Ice slowly builds up on the surface and impairs the cooling cycle. It’s common on scorching days in Anthem as systems overwork themselves, especially when they haven’t received proper upkeep.

The Solution:

Start by turning off your air conditioner and letting the frost thaw naturally. Check the filters next and replace them as needed. You may also need to refresh your AC coils if they’re dirty, which typically involves:

• Disconnecting the power to the system
• Clearing away grass, shrubbery, and other obstructions around the unit
• Vacuuming the coils with a brush attachment to remove loose dirt and dust
• Applying coil cleaner and letting it sit for several minutes
• Rinsing the components gently with a hose and allowing them to dry before use

Your owner’s manual should have more details on this process, so it’s worth a quick read.

2. A Faulty Condenser Fan Motor

Think of the condenser fan motor as the lungs of your AC unit. It circulates air to cool the refrigerant so the system “breathes” efficiently and stays functional. Fan motor problems often manifest as a buzzing or humming sound.

Loose hardware, thick debris, or worn bearings can also affect the fan blades and create a loud rattling.

The Solution:

Most centralized cooling systems in Anthem have their condenser fan in the outdoor unit protected by a grille. Refresh it with a vacuum cleaner if it has deep-seated grime.

If you have an older model, it may have worn parts that need replacing. An Anthem HVAC specialist can source and install the necessary components quickly.

3. Refrigerant Leaks

Is your AC unit making a loud noise that sounds like whistling or squealing? It’s probably refrigerant slowly escaping from a crack or loose connection. Other warning signs include:

• Random hot spots or subpar cooling performance
• Spiking energy bills due to the system working harder to compensate
• Ice buildup on the refrigerant lines or coils
• Warm air blowing from the vents instead of cool air
• A faintly sweet, chemical smell near the unit

The Solution:

Unfortunately, these leaks require professional attention. A certified technician can locate the source, repair the damage, and safely recharge the system with the right type of coolant.

4. Loose or Broken Parts

Air conditioners comprise countless moving parts, working together seamlessly to cool your Anthem property. All it takes is one loose bolt, a worn-out fan belt, or a misaligned motor to disrupt the harmony. Watch out for rattling, clanking, or any other red flag indicating two components are coming into contact in ways they shouldn’t.

The Solution:

Instead of trying to fix it yourself, book an inspection and turn off your setup in the meantime. Quick action prevents further damage and helps avoid costly repairs. The repair might involve tightening connections or replacing damaged parts.

5. A Malfunctioning Contactor Relay Switch

The contactor relay switch powers your air conditioner’s compressor and fan. Without it, the system might not turn on, or it could run continuously. A clicking, buzzing, or humming sound from the unit, especially during cycling or startup, can stem from a struggling connection.

The Solution:

Before carefully unscrewing the old relay switch and swapping it out with the new one, memorize its wiring setup or take a quick photo. If you’re not experienced in electrical repairs, err on the side of caution and leave it to a specialist instead.

6. Electrical Issues

Other electrical complications include loose wiring, damaged circuit boards, and blown fuses. Modern systems have built-in safety features that shut things down automatically, but older models may not.

The Solution:

Avoid using your cooling system until a professional gives you the green light. Buzzing noises combined with smoking and acrid odors could signal a severe electrical hazard.