Curious about that strange sound coming from your AC?
Unfortunately, a strange noise usually means something’s not working correctly with your system and may require the air conditioner to be repaired or even an replacement.
In this article, we’ll cover 10 different AC sounds and what they mean:
Let’s start with #1, a banging sound...
What causes the noise: A banging sound usually is a sign that there’s a loose component inside your compressor, like a connecting rod, piston pin, or crankshaft. Additionally, a banging noise could mean you need a new compressor.
Solution: Contact a professional to inspect your air conditioner’s compressor for any loose parts.
What causes the noise: Clanking could mean you have a loose part, possibly the compressor itself. This sound can also mean that the indoor blower and outdoor fan blades are out of balance. If you ignore this clanking sound, it will only get worse with time.
Solution: Contact an AC expert to check for loose parts and make sure your blower and outdoor fan are working properly.
What causes the noise: You may have a hard time knowing where the bubbling/gurgling sound is coming from, but it’s most likely related to a refrigerant leak. A gurgling sound could also mean that your condensate drain line is clogged.
Solution: Call a professional to check your AC for a refrigerant leak and to make sure your condensate drain line trap is clear of blockage.
Read our article 5 Signs Your Home’s AC is Low on Refrigerant for more info on how to detect refrigerant leaks.
What causes the noise: If you hear a very loud screeching noise, like metal on metal, when you turn your AC on, it likely means that the fan motor bearings are worn out.
Solution: You’ll need to have your fan motor replaced by a professional if you hear this screeching sound.
What causes the noise: Intermittent or constant squealing points to a misaligned or worn fan belt. The sound can sometimes come and go depending on temperature and humidity levels, which makes the belt expand and contract. If you don’t replace a worn fan belt, it will eventually break, so you run the risk of not having air.
Solution: Contact an AC technician to replace your fan belt.
What causes the noise: Let’s look at 2 different clicking noise scenarios:
1. Clicking while the AC is running: If you gradually hear clicking coming from your outdoor unit, there’s probably a small object obstructing your unit’s fan.
Solution: Turn off your AC and check to see your outdoor unit to see if anything is blocking the fan. Remove any objects that obstruct the fan blades.
2. Clicking when your AC won’t start: This type of clicking means there’s an electrical problem. The problem could be with the thermostat, compressor, or capacitor.
Solution: Contact a professional to inspect your AC’s electrical system.
What causes the noise: A buzzing noise also indicates that there’s an electrical problem with your air conditioning system. The electrical problem could be caused by a faulty relay switch, circuit breaker, or condenser fan motor.
Solution: Contact an AC technician to inspect your AC’s electrical system.
What causes the noise: Humming usually means your air conditioner has an electrical problem, similar to what causes a buzzing sound. Humming can also indicate there are loose wires/hardware, or a blower motor issue.
Solution: Contact an AC technician to check for any loose wires hardware and to make sure your blower motor is running smoothly.
What causes the noise: If you hear a slamming noise, especially when you turn off your AC, it could be caused by a variety of issues:
Solution: Contact an AC technician to check your air conditioning unit for these issues.
What causes the noise: A whistling noise is a sign of low airflow, which is caused by...
Solution: Try changing your dirty air filter and making sure nothing is blocking your return vents. If that doesn’t fix the whistling sound, contact an AC professional to look into the problem.
If you hear any of these 10 sounds, contact Red Cap Air to schedule an air conditioning repair. We’ll send one of our trusted technicians to your home to stop that annoying sound so you can have some peace and quiet while you stay cool.