Electrical issues are the main cause of outside air conditioners making loud buzzing noises. However, outside air conditioners make a loud buzzing noise when there’s a problem with the compressor, relay switch, damaged to isolation feet, it’s got loose parts, or it’s frozen.
During the hotter months of the year it’s nearly impossible to enjoy being home without good air conditioning. If your outside AC making loud noise continues it should be professionally inspected to prevent damage. This post will talk about some of the reasons an outside air conditioner makes loud buzzing noises.
There are various noises a central air conditioner can make. However, one of the more startling noises occur outside. If your air conditioner is making a buzzing noise that is loud enough to become a distraction in your home, chances are that something is wrong with your unit. Learn more about the causes below.
Causes of Air Conditioners Making Loud Buzzing Noises
If you find the A/C unit is creating a loud buzzing noise, and it’s a distraction within the home, it’s a likely chance that your unit is experiencing some issues. However, what that problem could be is the question, below are some of the possible issues that could be wrong with the unit when hearing a loud buzzing:
- Compressor is malfunctioning. An air conditioning compressor allows the unit to work property, as it is the part controlling the entire cooling system by pressurizing and cooling refrigerant within the unit. If you hear a loud buzzing from the compressor (outside unit), then it could be malfunctioning, or it could be a sign electrical voltage to the unit is not the correct amperage needed.
- Contactor relay switch.The thermostat controls the outside unit with a low-voltage switch. It works by switching high voltage on and/or off to the compressor in the outside unit. Compared to other parts, a thermostat is an inexpensive replacement.
- Damaged or missing isolation feet. The air conditioner compressor will be mounted within the A/C unit base which had rubber feet known as isolation feet. With continued user over time, these rubber isolation feet will often become disintegrated and/or cracked which causes the compressor to get loud due to unbalancing, and when operating it may buzz.
- AC unit is frozen. Although the purpose of an A/C unit is for use through the hottest days of the summer, they often freeze. The freezing occurs due to a leak in the refrigerant line, which may result in a buzzing noise from being emitted from the outside unit.
- Parts Loose. Another issue within air conditioners is a loose part. Due to the complex system with all the moving parts, if one of the parts gets loose, it throws off the syncing of the entire unit. This can result in other parts breaking or wearing prematurely, and can make a buzzing sound.
- Condenser fan motor. The condenser fan is the big fan you can see inside the unit outside. If you have the blower turned on and the fan is not moving, the noise could be coming from the fan motor.
If you have found any of the above issues to be the cause of your unit not working properly, or making loud noises, you need to contact a local air conditioner specialist to correct the issue.
Causes Of Air Conditioning Making Noise
Your air conditioner may not have anything wrong just because it is making noises. Although, if any of the following are being created from the A/C unit, the best approach is to contact a licensed HVAC professional to get the system inspected:
If the unit is creating a squealing noise, it could be the belt which connects the blower and motor. It may have broken, or simply slipped off. It could also be bearings on the condenser fan motor needing replaced due to wear.
Banging or Clanking Noises
If these sounds are being headed from the outside unit, it is often the motor or blower assembly.
When switching the unit on or off, if there is a clicking noise, this is normal sounds. However, a repetitive clicking sounds could be a defective relay.
If you hear rattling, it is often a sign that part of the air conditioner has gotten loose. With this sound, the louder the rattling, the more serious the issue can be.
When humming, it can be a sign of the starting capacitor beginning to fail, or the motor could be needing a repair.
Does your air conditioner unit seem to be screaming at you? If so, this is a sign the compressor might be going bad.
How To Fix Air Conditioner Making Loud Buzzing Noise
If your air conditioner unit is putting off a loud buzzing noise, the only way to correct the issue is to turn the A/C unit off, then call a professional air condition repair specialist to have it inspected and repaired.
Even with making noises, your unit may cool the house down. However, this does not mean it is safe to operate. By operating the air conditioner when it has an issue can result in more damages and increase the repair costs. Its better to be on the safe side.
Buzzing Air Conditioner Repair In Phoenix
Do you live or work in the Phoenix Valley and have an outside air conditioner that’s making a loud buzzing noise? A/C & Refrigeration Co. can help! We provide award-winning air conditioning repair services to Phoenix, Arizona and the surrounding areas like Fountain Hills, Tempe, Glendale, Paradise Valley and Scottsdale.