probably a bad thermostat or set at the wrong setting. If you have a digital thermostat the steps are a bit much to type out. If you have the older and more common mechanical thermostat it should be set about midway. The knob is typically marked from 0 - 9 and should be set on 4 - 5. get back to me if you have the digital control.
Sounds like the evaporator coil is icing up. Once the coil ices up no air can flow through and you essentially have a very large ice chest. The thermostats on these coolers are actually sensing coil temperature not air temperature. I would want to check that it is set properly and that it turns the compressor off and on. If you have an old mechanical thermostat with a knob with settings from 0-9 it should be set on 4-5. Anything higher and it WILL ice up occasionally.
Sounds like it may be cycling off hard due to high discharge pressure. Make sure the condenser under the unit is clean and the fan motor is running. It shouldn't be running 60f. A lot of people make the mistake of checking temperature with an empty unit. Put a couple of gallons of water in the unit so that the temperature evens out. These units do NOT run based on air temperature but rather on inside coil temperature. That will swing wildly with no load in the unit.
Make sure condenser coil is clean because it might cause overheating the compressor and thermal overoad will trip. Next is to check ampere rating on the compressor. It might be caused by sticking starting relays. You can base ampere rating in the sticker inside. All true units have it
1 in a refrigerator is the coldest setting
it should be around the 4-5 mark for proper cooling of food in a refrigerator
1 is the warmest setting in a freezer
If the unit is near a high heat source and the temperature is pretty cold inside you will get condensation. Also check the door gaskets on the lower doors for cracks or gaps
Many refrigerators have 2 fans.
One , outside and underneath, is to cool the motor and/or the compressor.
The other, inside, is to circulate the cooled air to all of the areas of the inside .
Either one can become dirty, and make noises, and the one inside could also become covered with ice or frost and make noise as the blades hit the housing,
The outside underneath one is easy to clean.
I know of no way to clean the inside one except to take the whole inside of the fridge apart.
God bless your efforts.
First, I'm not a TRUE Refrigerator tech, but I have worked on similar retail display beverage/food chillers.
* There is dangerous electrical equipment and High pressure refrigerant present in this equip. Only qualified CFR tech should service this equipment.
*** There are following is for information only.***
* the fan(s) are usually connected in parallel so if one is out and the other is still working then it's probably the fan. If you can't get a new fan from your service vendor you can order it from you nearest Grainger or Amazon.com. It's a pretty standard fan. Check and note what kind of connector is used so to order the motor with the correct connector.
* There is an off chance that the fans are on a separate line off the main fan switch (Like a double pole switch) or relay. Check the relay for burns. Normally the fan wires are jumpered together as they both are turned on at the same time. The jumper lug may be rusted, disconnected, or broken. Unless someone has serviced the fan(s) earlier the wires should be okay and it's just the fan. (it's a moving part that goes on and off all day long.)
* Have the electrician check if there is still power going to bad fan connector (after disconnecting bad fan) There should be power at the connector with the other fan powered up.
* Check your warranty before attempting repairs as these units usually have long warranty periods. Call for service anyway as there may be other problems that caused the fan to fail.
Aloha, ukeboy57
PS: Helpful vids I found on you tube:
https://www.youtube.com/watch?v=t1D05iEwexshttps://www.youtube.com/watch?v=c0fSd4gwAXghttps://www.youtube.com/watch?v=Zo3tMk89bnMhttps://www.youtube.com/watch?v=81kZ9SJro40
See if you can catch it next time its running....
Serious answer, your coils are probably filthy. Get a vacuum and remove the service vent and clean out the compressors condenser coils. That is the usual cause of this. If you dont, itll overheat the compressor and you will have an expensive metal cabinet instead of a fridge.