Longtime lurker - what a great site with real pros. I an an engine/computer/diagnostic guy with some AC experience, and really would appreciate some input. Here are the facts bulleted and if someone could let me know their thoughts I would appreciate it. The technician is very friendly and conscientious but can only do what LG allows.
1) LG french door fridge went warm and was diagnosed as a bad compressor. Model LFX29927ST/03. Operated flawlessly until the compressor failed.
2) Initial service call tech diagnoses and cuts out compressor - then says the software won't go into the board. Comes back about 10 days later and installs compressor/filter-dryer and board. Freezer can't reach temp, hangs around 20 degrees. I tell him if I unplug it, it seems to be a little better after plugging pack in but never performs properly
3) Comes back about a week later and evacuates and recharges system. Still doesn't freeze. Same scenario, unplug it and it gets a little better - will see some 12's in the freezer.
3) Tech says wrong board was installed. Comes back another week plus and installs new board. turns on fridge then realizes needed to program it. Turns off fridge and programs new software. Same thing - never really gets cold. Unplug it and over the next several days it sloooooly gets colder and we see some -4s and temps around 0. But still not staying thoroughly frozen (test pack of hot dogs confirms no true deep freeze)
4) Tech comes back out to do evap and condensor but at the last minute LG tech support tells him to just do a freezer thermistor. We test the thermistor while he is here and it is dead nuts. He replaces it anyway and leaves. Same thing - fridge is hanging warm. I unplug it and over the next day plus is slooooolw starts to show some colder temps in the freezer. With the unit unplugged the temps were equal on the gauges. He also says that running the low side is at a 10in vacuum (i thought that might be a little low but I am not a fridge ac tech)
I believe there is a partial clog or debris in the system. We are now in a situation where he doesn't want to come back because he is afraid he won't get paid by LG for the evap/condensor. He considers it non-fixable.
LG tech support is telling him it's a control issue. I believe this is because when by the time he measured the resistance at the board with the door open, the air was already acting on the thermistor. He claimed it was saying it was 12 degrees warmer that he shot on a surface in the freezer. I explained if it thought it was warmer, it would be running and making it even colder - not the reverse. Again, after it was replaced the thermistor was dead on. 33 degree water was like 7.95k ohms and spec is 8k at 32F. Also no skips in thermistor that was replaced - watched it steadily sweep.
He claims cap tube is not clogged. Suspects there may be something in the system but says he blew it out with nitrogen at 150 psi. I do auto ac occasionally and know that we have flushing solvents - nothing like that was used. I also know that partial or floating clogs will greatly affect efficiency. Leaks have been checked and triple checked and pressures stayed the same each time for him. LG tech support suggested a "micro leak" but I call BS because the repair tech said he evacuated nearly 100% of listed charge and that the pressures stay the same and no leaks are visible.
So now we have a fridge that is under warranty for a failure they can't fix.
Anyone see a smoking gun from the description? Anyone think if we replace a certain sealed system part it will be ok?
Wife likes LG but I keep explaining about all the failures I read about - what is the most reliable brand from a professional's perspective? I really don't want another LG after dealing with their customer service at this point.
Thank you for reading a long first post.