I had the same issue after the unit was two weeks old. Marvel sent service people to service the unit, but they ultimately told me that the unit was not suppose to get any cooler because "of federal regulations" (I kid you not). I had to have an unaffiliated repair person remove the digital thermometer and put in a manual one. Now the unit cools well and I am pursuing Marvel for the $200 the service person charged me.
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i don't know much about these units,don't work on them but work on sub zeros and have helped out some customers that have me look at them,usually what i find is when they are cool but not cold is the coil is blocked with dust and the heat can't escape from the machine,i use a shop vac,i vac out as much of the dust that i can see and then set it up to blow and blow out the coil,after doing this it usually works
you have a restriction in the cooling side sounds like the filter line dryer is clogged up and will need to be replaced. Also the system will have to be recharged by a professional check to see if its in warranty.
It sounds as if the control system is malfuntioning. If your unit is a non-digital control, you most likely have the SSAC control which has three parts: Control Board, Thermsitor and Potentiometer. The part that fails the most often is the thermsitor. You will need to get to the back of the unit. With it unplugged, take the bottom back cover off to gain access to the control usually located on the left (looking from the rear). It is a 2-inch square black box with 7 terminals and 4 DIP switches. To bypass the control and test your compressor...run a jumper wire from terminals 2 and three (or disconnect those black and red wires from those terminals and connect them together). Plu the unit in...if the compressor runs and the unit cools, you have one or more failed components in the controls. Un-plug the unit and return the wires to normal. You can test the thermsitor and potentiometer with a multi-meter. Disconnect the termistor from terminals 4 and 5 and check it's resistance. If the interior of the fridge is near room temperature, it should read 2.0 to 2.3 k-ohms. If it has a very high reading (greater than 10k-ohms) it will not allow the compressor to start. Reconnect the thermsitor and disconnect the potentiometer from terminals 6 and 7. The the control dialed to max cold (about 7) you should get 90k to 96k-ohms. If it is less than 25 ohms, the refrigerator will not start. If both of those components check out, then the control board itself is bad. All three components can be ordered from the factory by calling 800-223-3900. They sell them seperately or as a kit with all three components. I hope this helps.
More than likely your socket has a bad connection (probably the ground). There are two switches that can send the socket power...the door activaed switch and the manual override (ON/OFF button in the toe-kick). If you turn on the manual switch and the light is steady, then the door switch is bad. Otherwise I would trace out the connections on all the switches and on the back of the socket.
When you said it stopped working, do you mean it is not working at all? or is it not cold enough? If not working at all, that will be thermostat, when you change the thermostat, did you adjust the small switches to match you unit and make sure wires are connected properly, If not, it would work properly. If not cold enough, check and make sure the condenser fan motor and compressor are running, if both are running but not cooling then you have sealed system problem.
I experienced same problem with my refrigerator, Marvel ar61. Call Marvel and they will send you a repair kit which includes a new thermostat, switching relay and a new thermistor. My refrigerator is working great.
I also have the same problem. Our Marvel 6BAR runs continuously until
the beverages freeze. A technician came out and replaced the thermistor
under warranty. It was a simple repair that anyone could do. This
solved the problem for about another 18 months, but it has returned. I
will now search for this part and do the repair myself. It only takes a
few minutes to do.