• Please note, some of the links on our site are affiliate links (Learn More)

LG LFX33975ST\02 not cooling\freezing - replaced compressor less than 2 years ago

gexamb

Premium Member
Joined
Apr 7, 2021
Messages
3
Location
US
Model Number
LFX33975ST\02
Brand
LG
Age
6-10 years
Hello everyone. I couldn't find any hard evidence of the problem anywhere so here is my post.

I have had the LG LG LFX33975ST\02 fridge for about 6 years now. I had it serviced under warranty by an LG certified tech back in Dec. 2019, so it has only been a little over 1 year ago. They guy replaced the compressor, condenser coils, and I think the dryer tube. I am having the same problem again now which is the fridge and freezer temps are not getting down to temperature. I have been monitoring for the last 2 days and temps will not drop below 43F and 20F, temps are set to 37F and -4F. Fridge has been completely empty during this time as well. The tech said these units\compressors really suck at staying cool as it would overheat. He told me it would be a good idea to cut a hole under the tile to route in fresh air from the crawlspace to help keep it cool since the location of the fridge is enclosed around cabinets. I even built this cardboard contraption to route the exhaust air up and away from the bottom of the fridge so it doesn't trap in the heat.

Some testing I did so far:

  • checked fridge evap coils - not frozen\no blocks of ice
  • checked freezer evap coils - not frozen\no blocks of ice
  • fans for fridge\freezer\dispenser all work fine - have not tested voltage
  • defrost heaters seem to work fine. ended up burning my finger when I checked the evap coils after 24 hours of operation to check for ice buildup. coincidence that I checked during the defrost cycle I guess
  • voltage to the compressor is steady at 320-330V
  • green blinking LED on main PCB board, 6 blinks
  • no error codes
  • noticed corrosion on compressor solder joints - picture don't show very well because I cleaned them with a damp towel
  • since compressor was replaced, I guess it is not completely sealed anymore? has 2 ports on it
  • everything else is pretty clean, and works as expected
  • little to no water in drain pan (tells me it's is not really freezing up the evap coils?)
  • compressor makes a very weird and loud gurgling noise intermittently (like freon is boiling?)
  • comp does get very hot during peak operation
Kind of seems to me like a refrigerant leak?

What else can I check?
 

Attachments

  • IMG_20210408_165216662_HDR.jpg
    IMG_20210408_165216662_HDR.jpg
    204.6 KB · Views: 109
  • IMG_20210408_165203654.jpg
    IMG_20210408_165203654.jpg
    397.3 KB · Views: 136
  • IMG_20210408_165151553_HDR.jpg
    IMG_20210408_165151553_HDR.jpg
    205.3 KB · Views: 118
  • IMG_20210408_165144293_HDR.jpg
    IMG_20210408_165144293_HDR.jpg
    201 KB · Views: 119
  • IMG_20210408_160402999_HDR.jpg
    IMG_20210408_160402999_HDR.jpg
    245.7 KB · Views: 111

gexamb

Premium Member
Joined
Apr 7, 2021
Messages
3
Location
US
I didn't mention that:

  • evap coils actually do get cold\freezing, just doesn't become solid ice
  • fridge is standing out from its location a good 2 feet to give it enough air, no help
  • weird gurgling noise is random (to me) and doesn't last that long. Comp continues running as usual without the strange noise
  • See video - https://photos.app.goo.gl/hJiJZLYmYJgtGfLt5
 

gexamb

Premium Member
Joined
Apr 7, 2021
Messages
3
Location
US
Checked compressor voltage from PCB with harness disconnected (CON201) - measured ~130V once it got up to speed. Connected compressor back, and check voltage again 280V and rising! Is compressor just pulling more current because sealed system issue? This thing is only rated for 220V.

Such a waste to dump this thing.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,958
Location
McMullen Valley, Arizona
Yes, you have a sealed system problem. The compressor sounds bad in that video too. Most likely that compressor they replaced is shot as well.

LG has been notorious for compressor problems.

Whirlpool, Maytag, KitchenAid, and Amana have very reliable compressors.

Jake
 

Houptee

Premium Member
Joined
Aug 18, 2018
Messages
37
Location
NEW JERSEY
They came out with a newer "universal" version linear compressor probably right after you had yours replaced so you got the older original version.
The new one has red decal on top and says the software must be updated on the main board with special LG jig.
It is probably out of the 5 yr labor warranty now so they might supply a new compressor under 10 yr warranty but you pay the labor and drier and r134a but all this has to be done by a LG authorized tech they won't send you the compressor unless a tech comes out and diagnoses it as bad.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,958
Location
McMullen Valley, Arizona
Thanks @Houptee for that added information.(y)

Jake
 
Top