I have been battling a similar issue with my fridge and freezer. I have done all of the suggested fixes with mixed results.
1 nothing was working even when level so removed the fridge and went through the complete burp procedure. freezer compartment began to work but fridge was not getting cold.
2 installed fans on the fins in the back (see photo) these are thermostatically controlled and only turn on when the unit is heating. Both Electric and Gas are heating perfectly. Fans turn on and fans turn off as they should and freezer gets to 0 degrees with no problem fridge at about 55
3 "beat the thing with a stick" It was suggested that sometimes a bit of particulate will get stuck in the piping in the back and a few taps on the coil in the back can loosen things up enough to get them working again. Not only was this enjoyable as I was very frustrated at this point, but it actually worked. Freezer at 0 fridge at 37, fans working properly ready for cold beer. but only for a day...
4 It seems like it all starts well then there is a back up and the thermostat inside the fridge was not telling it to shut off so it was continuing to heat with out circulating the "stuff" in the back and then all the pipes in the back were blistering hot and no cooling in the fridge. When this happens the fridge and the freezer go into what I would call a defrost mode. They actually heat up.
Decided to replace the thermostat inside the fridge. This worked. All was back to working fine, for a day.
5 I began to realize that when the outside temperature was below 50 degrees the fridge and freezer both work great. I can adjust for the Max to Min and change the temp in both compartments as I would desire. But if the outside temp goes above 50 degrees, the unit does not want to shut off and goes into the over heat mode.
6 decided it was sad that it had sat since October. I took it out and drove around many mountain roads here in Western NC and experienced several RR crossings. Lots of time to shake and rattle. After I returned home I jacked it up to insure that it was perfectly level inside the fridge. I let the whole thing sit for 24 hrs and then tried it again. I turned it on in the evening and was excited when the next morning it was at perfect temp. Unfortunately when I returned home the following afternoon (outside temp 72) the unit was in full on heating mode and the freezer was at 28 and the refrigerator was 68.
I know the unit has ammonia in it and that it is not leaking. I know that both electric and Gas heating elements are working (they get hot). I know that it works fine when it is very cold outside. So can someone tell me why it won't work when it hits above 50?
I have even tried the trick of putting an 110 fan in the outside compartment blowing up to force the hot air out the vent on the roof. I have plenty of air movement there. is there some other thermostat that I am not aware of that could be sticking?
I guess if all else fails I will just use it as a giant ice box. Has anyone ever tried putting dry ice in their fridge?
Walk softly and get a bigger stick to beat your fridge.
Any help would be most appreciated. The DW is tired of hearing about this each and every day.