Your blower could be going bad, or it might be unbalanced in some way. To remove the cause of the noise, shut off the power to the air conditioner, remove the fan-housing panel from unit and inspect the fan housing area. It might be good to call in an air conditioning specialist to look at your unit to get things back to normal. Some air conditioning systems have dampers to change the amount of airflow reaching different parts of your home. What Size AC Unit Do I Need? Another warning of this possibility is if you notice a decline in the cooling output. Grinding is typically caused by a faulty condenser motor. Usually lasts 10-15 seconds before stopping. This noise started a few days after I put the AC back in the window. It could be a nest or some leaves getting in the way of the unit operating as it should. Air Conditioner Makes Loud Noise After Shut Off. Clicking Sounds, Air Conditioner that won't stop, Rapid Clicking Noises, Cycling Humming then Click every 20 seconds List of causes of clicking noise at air conditioner or heat pump equipment. Some of these noises can also happen due to problems with your fan. The heat of the summer doesn’t have to get you down when your air conditioner is working properly. Clicking noises while the AC unit is running will also be concerning, but it won’t be nearly as big of a deal. It's not high pitch but still noticable. Banging Noiseseval(ez_write_tag([[300,250],'freshairguru_com-box-4','ezslot_5',110,'0','0'])); Banging noises will certainly startle you but they are often simply being caused by something obstructing your fan. Squealing noises while the AC unit is turned on will also mean that you need to repair or replace or something. Take the time to assess the situation to see what you’re dealing with. Update: Thanks halfmoon & Pecan F. I have had this air conditioner for 10 years and have never had problems until today once the buzzing noise started. If every time you turn on the heating or cooling system, the air ducts start popping and banging, read the rest of this article for tips on how to reduce and even stop the noise entirely. It's normal to hear some noise from the refrigerant equalizing in the system after it shuts off. A closing damper. This is not a normal operating noise and is usually a sign of one of the following underlying problems: Air Conditioner Clicking Noise When Off. T has been doing this for a while and continues to cool properly. Wiki User Answered . Does anyone know what the problem could be????? Possible reasons for air conditioner (AC) making so much noise & Best Solutions. The larger makes an obnoxiously and abrupt, load "Clunk" when it shuts down. The gurgling noises are a sign that your AC unit has a refrigerant leak somewhere. Outdoor compressor’s internal support springs are busted There are actually a few reasons that your air conditioner might make loud noises after it has been shut off. The cause of this problem can be the result of a number of possible issues including extreme temperatures , a broken thermostat , a faulty relay switch , or even a damaged short circuit . It is a warning that … Noises like this can also be attributed to loose parts moving around inside the AC unit. This video is about the sources of NOISE from an Outdoor Air Conditioning unit. Air conditioner loud noise when shuts off. If you follow the advice that has been listed, then you should be able to get things back to normal. Air conditioners rarely quit without any warning signs, which means you have to be on the lookout for any indicators that things are amiss. What i find odd is i turned off power from outside but noise kept coming – SeanClt Jun 13 '16 at 1:08 It makes no sense. If you’re left scratching your head, then it’s a good idea to consider calling in professionals to take a look at things. Freshairguru.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. A/C units tend to get louder as they get older but a grinding sound is never normal and always an indication that something has gone wrong. Noisy air condition blower or rattling sounds when you turn on the air conditioner can be because of different reasons. You’re going to want to replace the compressor right away, and you might need to call in a professional to do the repair job, depending on what skills you have. Occurs at the outside air conditioning unit when the AC first turns on. Blower motor fan problem. If you hear a grinding noise coming from your unit, be sure to shut your AC off at the thermostat. The professionals advise you to turn off a screeching or screaming air conditioner right away & call your local trusted repair shop. Clicking – If the clicking happens when your unit kicks on or shuts off, that’s normal. You can unsubscribe at any time by clicking the link at the bottom of our emails. However, in the last few months it makes a booming noise when it shuts off? You can simply go outside and remove the obstruction to get things back to working normally. And could it be an indication that you need repairs to your system? What Causes An Air Conditioner To Ice Up? Rattling – Usually, rattling sounds mean that a component in your air conditioner has come loose. Asked by Wiki User. Out air conditioning unit is probably 25 years old and cools well. This can happen when your air filter is too dirty. Then, when the AC turns off, the filter drops to the grille, making a slamming or thumping noise. We have the same "slamming" shut off noise problem followed by a rattle on one of the two Carrier model 24ACA air conditioning units that we installed in 2007 to cool our three story townhouse in Houston, TX. In some cases, the fan’s mounts can get loose and throw it off balance as it slows down, causing it to hit its enclosure. If your air conditioner is making these noises immediately after it has been shut off, then it can be an indication of a few different things. While all HVAC systems make some noise when they are on, when there is excessive noise, such as popping, knocking, and banging, it can indicate a problem. If the noise is coming from inside, then there is a good chance that you have an air filter problem. What causes the noise: If you hear a slamming noise, especially when you turn off your A/C, it could be caused by a variety of issues: An air filter that’s slamming against the return grille. If you hear high-pitched whistling or screaming, shut the air conditioner off and call a professional right away. Another possibility could be a issue with the dampers. If your air conditioner is making a rattling noise, it may be a sign there is something wrong with the assembly motor or blower. Noisy air conditioner solution: Fencing one or all sides of an air conditioner’s outside unit can deflect noise. The slamming noise is likely the damper closing after the AC shuts off. If, however, you hear a number of thumps or consistent thumping, it may be time for a specialist to take a look. To figure out the problem, you’re going to need to be able to tell if the noise is coming from the inside or the outside. Pulsating noises and loud buzzing noises definitely aren’t normal, though. What causes banging noise when home air conditioner shuts off? You have to be able to differentiate an unusual air conditioner noise from a typical operational noise. 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