If you recently started hearing a high-pitch buzzing noise coming from your AC system, you probably want to know what is causing it so you can get it fixed. The first time you hear the sound, it is very unsettling.
The pitch is extremely high, and it is so shrill, it can keep you awake all night. But what is it? Keep reading to find out.
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What Are The Most Common Reasons For Your Air Conditioner Making Noise?
If your air conditioner is making an unusual sound, it indicates that something is not right with your system. Depending on the sound, you might be able to use it to figure out what is wrong with your system and potentially fix a noisy air conditioner.
For more information on troubleshooting different AC sounds, check out this video:
Squealing Sounds
If your air conditioner is squealing when the fan, heater, or air conditioner is on, it is likely a misaligned or worn belt that connects the motor and blower. The sound may come and go from time to time, but it will be consistent for the most part.
If the squealing is coming from the indoor AC unit, it should be fine to run your air conditioner while you wait for a service technician to arrive. However, there is a possibility that the belt could break while you are using it.
A Screeching Sound
If you hear a screeching metal-on-metal sound that starts when you turn your air conditioner on, it is most likely the fan motor bearings in your condenser unit. When the bearings wear down, it causes the fan motor parts to grind together, which causes the sound.
Your air conditioner may continue to work for a while with lousy fan motor bearings, but using it that way will damage other parts that are more costly to repair. That is why it is always best to address HVAC troubles as soon as possible.
A Loud Buzzing Noise
A buzzing noise coming from your air conditioner can be a few things. The buzzing noise can be the system trying to power on a not working component, or your unit could be frozen due to a refrigerant gas leak.
You should address any issues causing your air conditioner to make noise as soon as possible. If the problem is loose parts, you can probably continue using your AC while waiting for the AC repair professional to arrive.
Other sources of a buzzing sound might cause damage to your air conditioner if you continue to use it, or they may prevent your AC from working.
Common Reasons for Your Air Conditioner Buzzing Noise
If the buzzing noise is coming from your compressor, your outdoor unit is getting low voltage, you have a malfunctioning compressor, or the capacitor might be impaired.
Loose parts rubbing together in your HVAC system can cause a rattling or buzzing sound. You must fix any loose parts because they can damage other air conditioning components.
Low levels of coolant will cause your unit to freeze. So, when you hear a buzzing sound, you can check your indoor and outdoor AC units for ice.
On the indoor unit, you may find ice on the evaporator coil. On the outside unit, ice on the refrigerant lines indicates low freon levels.
If you suspect your refrigerant levels are low, you will need a licensed HVAC repair professional to recharge your system and fix any refrigerant leaks.
A broken contactor can cause a buzzing noise. Contactors can go out, but the issue could also result from an improper voltage or even a piece of debris in the contactor.
Humming Noises
Like the other sounds your AC can make, humming noises can mean several things. Some are easy to fix, while others require the assistance of a licensed HVAC service technician.
If the issue is unbalanced isolation feet, you can use your air conditioner until you can schedule a visit from an air conditioning repair specialist. If it is an electrical issue, you should wait until the repair service diagnoses the problem.
Common Reasons for Your Air Conditioner Humming Noise
The compressor in your outdoor air conditioning unit sits on isolation feet, which helps to dampen the sound your AC unit would otherwise make and prevent damage to your unit from the parts vibrating.
Over time, the rubber feet can get damaged or become unbalanced. There are repair kits you can buy to fix the isolation feet.
Electrical problems can cause different sounds. So, if you hear any strange noises from your air conditioner, the source could be any of these electrical components:
- A broken contactor relay switch
- Improper voltage
- Thermostat wiring problems
- A broken or tripped circuit breaker
- Electrical arcing
- Broken electrical connections
- Loose wiring
- A low-voltage switch
Low levels of coolant will cause your unit to freeze. So, when you hear a buzzing sound, you can check your indoor and outdoor AC units for ice.
On the indoor unit, you may find ice on the evaporator coil. On the outside unit, ice on the refrigerant lines indicates low freon levels.
If you suspect your refrigerant levels are low, you will need a licensed HVAC repair professional to recharge your system and fix any refrigerant leaks.
A broken contactor can cause a buzzing noise. Contactors can go out, but the issue could also result from an improper voltage or even a piece of debris in the contactor.
Final Advice When Your AC Is Making A Loud Buzzing Noise
It does not matter what is causing your air conditioner to make noise; you need to get it fixed as soon as possible.
If it is something minor, it should not be very costly to repair, but leaving it could damage more expensive components.
Related: Why is My AC Making a Loud Noise When Starting or Shutting Off?
Did You Know
Your air conditioner may continue to work for a while with lousy fan motor bearings, but using it that way will damage other parts that are more costly to repair.
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