Question about LG Heating & Cooling

2 Answers

Noisy indoor air conditioning units

I have 3 indoor air conditioning units which are 2.5 years old. 2 of them are constantly noisy, sounds a bit like a fan that's not been looked after. The noise is gradually getting worse over time. However, the 3rd indoor unit is almost whisper quiet. The only difference in day-to-day usage is that the 3rd unit is almost always left on air circulation mode (i.e. not cooling or heating). In case it's useful, the outdoor unit is pretty quiet and hasn't changed in noise level. The 2 noisy indoor units continue to make the same noise whatever mode they are on, e.g. ciculation / cooling / heating.

We regularly clean the air filters and the units are serviced twice a year. I've gone through the manuals and I couldn't find anything that might help explain the problem. The people that service the units (and originally installed them) have dodged the question of noise. Whist the units were under warranty, 2 motors were replaced and one of the motherboards.

We bought LG units on the basis of their excellent reputation and in the case of these particular indoor units, LG emphasised how whisper quiet they are.

Also, the installers fitted a pump to each of the indoor units . Last year, these pumps were replaced with quieter ones but they are still quite noisy. In particular, 2 of the indoor units are upstairs and therefore have the advantage of gravity (relative to the outdoor unit).

My questions are:

1. What is making the noise?

2. What can be done to fix it?

3. If it can be fixed, can anything be done to stop it happening again?

4. Are the pumps really necessary on the upstairs units? It seems odd that LG didn't include them with (or even as part of) the indoor units. If they are necessary, is there a quieter alternative?

I couldn't find the product on the drop down list. It's the LG Art Cool Mirror Inverter Air Conditioning System, Single Split Wall Mounted. I think the original product codes would be one of C09AW, C12AW, C18AW or C24AW. The downstairs unit is larger than the 2 upstairs units.

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

The noise you are describing ..if the indoor coil is clean and the fan blade are clean..i would say you have a charging issue with your unit thats causing the noise..most ac units come with a preset amount of refrigerant in them... say a unit has come charged with 25 feet per run..if your run is longer than this u would have to add gas..i think its .22 per foot needed.. e.g...if your run is 45 feet and its recharged for 25 feet you would do this 45 - 25 = 20 * .22 and add the extra charge to the unit... this will stop the noise which i believe is not enough liquid getting to the coil, causing that swooshing sound..not just lg units do it but all units do it if not evacuated and charged properly...i hope this helps..

Posted on Mar 30, 2014

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.


    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

  • Expert
  • 81 Answers

Ok. So first things first. LG have a reputation with all their products. THEY ARE ALL BAD! If you remember GoldStar, they are now LG. GoldStar had horrible products. Now this is what LG has. The fact that the filters are cleaned and the units are serviced is an abosulte plus and will provide the units with extra longevity. Now are these drains are they used for water drainage. If so the upstairs units shouldn't need them unless there is some sort of rise in the drain pipe.

Now to the noise. It seems like there is something which is causing the fan to make a noise. It could be loose bearing or a piece of the fan which has broken away causing it to hit the inside of the unit. Since it is on both units, it would be a generic problem with this series and unfortunately is what you are stuck with now.

To combat this problem, I would: ring LG and the company who installed them and demand that they be repaired and have a warranty on the repairs. Just a heads up, LG are really bad to contact should you have a complaint, so keep persisting that they be repaired free of charge since that they are still under warranty.

If you are not happy with LG or your installers response, I would remove the units and have another brand put in. I recommend Mitsubishi Heavy Industries and Panasonic. Both units are whisper quiet. In fact they are quieter that the LG.

Oh and that only reason why LG boast about their "whisper quiet-ness" is because that is probably the only good going for them - and thats' not even right!

I hope that I have helped you in some way. Good Luck!

Posted on Jul 16, 2009

  • Dell Aug 07, 2013

    I tried calling them and complaint about the noise issue iwth no avail. Now I know not to get LG products.

  • earlston2004
    earlston2004 Mar 30, 2014

    also i further believe the noise is definitely a charge issue because u only run the 3rd unit in fan only... meaning no gas is going through the pipes..i'm pretty sure u have a charging issue..



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do i fix a noisy indoor unit fan motor

I have a 40 year old Sears fractional HP dehumidifier that gets noisy from time to time and I solve this by applying some oil to the motor shaft next to the bearings on the motor. The other possibility is the fan blades may be slightly touching something.

Sep 20, 2016 | grunaire GSI091HXB / GSU091HXB 9,000 BTU...

2 Answers

FA4B blower assembly noise

It is possible that the actual fins have separated from the hub. Hold the shaft of the motor (as to stop it from spinning) and the try to spin the fins. You then may notice the welds are broken. Could just be a bad motor, could be just the wheel. Good Luck!!

If you need further help, reach me via phone at

Aug 31, 2017 | Carrier Heating & Cooling

1 Answer

My ac unit is in the attic is this normal

Do yu mean the compressor unit is in the atticor the indoor blower unit. If its the indoor blower unit thats fine though kinda hard to work on but it keeps the noise down. If its the compressor unit.. Hm mmm Not the best place for it . hard to work on and noisy I'll bet

Aug 09, 2011 | Carrier 38CKC024 Air Conditioner

1 Answer

Looking for a manual on general overhaul procedures for an old 1979 Webster dual piston air compressor. One piston gets very hot and compressor is quite noisy (sounds like piston slap maybe?).

I have an old De vilbiss twin cylinder air compressor that got noisy. Pulled the head off and found a lot of dirt piled up on one piston (the unit had a very primitive air filter for many years). Scraped the piston clean and washed out the intake passages. Replaced the old filter with an automotive application filter--the compressor sounds like new again. May you have similar good fortune!

Aug 11, 2010 | Garden

1 Answer

My three year old Frigedaire window air conditioner is noisier and not cooling like it did before.

A noisy Air Conditioner is caused by a few things.

1. The most common failure is the blower fan hub has cracked and the blower wheel is dragging on the internal chassis area. You will have a very low air flow and lots of noise.

2. The evaporator coils are clogged with dirt. An air-conditioner that is used around the clock should be thoroughly cleaned every 90 days.

3. The condenser coils are clogged in the back of the unit on the inside.

4. Dirt has caked up on the fan blades and the motor is now driving both the blower fan and the condenser fan in an out of balance condition due to the dirt build up.

These are all things that cause a noisy air-conditioner.

If you need more assistance after this just respond here.

Thanks for using FixYa.


May 20, 2010 | Heating & Cooling

1 Answer

Noisy outside from the Unit

Could be compressor noise Improper charge bad fan motor hard to say. What is the brand name of your unit. Russ

Jul 20, 2009 | Ruud Handle Air Conditioner

1 Answer

Noisy unit, not cooling well, water drip from air intake

First please check the air filter and clean it and refix it.
Please check the refrigerent level next if it continues. Refrigerent leak will result in poor cooling and enhance the noise level.
The compressor could be defective and might take high power to run and only replacement of the compressor could improve the working condition.
In case the unit is more than 5 years old it is wise to replace it with a new unit and save your power bill.

Jul 06, 2009 | Dometic Heating & Cooling

1 Answer

Noisy unit,it makes pumping noise thru the whole house.

you have already used it for 10 years, now please buy the new one and give kenmore little rest!!! whatsay?

May 18, 2009 | Heating & Cooling

1 Answer

Noisy Servis M9503S


Remve the belt, and turn the drum by hand, if it sounds rough or is noisy, then yes the main drum bearings have failed.

It is a DIY job , but can be expensive, probably cheaper to buy new washer if it is more than 3 or 4 years old.

Nov 22, 2008 | Hoover AAA140 Front Load Washer

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

1,121 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Heating & Cooling Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a LG Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides