Thermostat wont shut off unit

the cooler should cycle several times daily. as set point is reached unit turns offuntil inside temp rises to set point an it comes on again
instruction manual covers that
https://www.manualslib.com/manual/1306105/Mastercool-Mcp44-C.html?page=5#manual

If the thermostat has a control on it, you can perhaps decalibrate it so that the unit shuts off at a higher temperature than normal.

Replace the dor seal

hi,
Wine cabinets work off of cycle defrost, so in order to built frost your temperature sensors are not working properly. I would look for corrosion on or in connections to be the fault or problem. Sensors report information to control unit and thats there only job. Its the control unit that dictates function. Look for corrosion to be the problem, clean connection and seal with RTV when connection a corrected.
Good Luck

I’m happy to help further over the phone at https://www.6ya.com/expert/gere_bf68e6055dd61249

need to replace thermostat

Possible that the thermostat is not working, ry reducing the control down to see if the cut off takes place.
It there is no action, shut offfor 8 hours and check witha lower settings. If the unit goes on , then you have to check the thermostat and control for fault.

Possible that the thermostat control is not reacting to the setting.
so you must check if there is any break or replace the unit.

Set the thermostat knob to position cool scale completely to the right or if in numbers to highest number i.e. 9 0r 10. There is nothing wrong with your AC it is only the thermostat setting

I take it once the temp is set to 71, and the ambient temp reaches 68 or so, it shuts off, never to come on again?

If that is true the thermostat in the unit is damaged, worn out or in need or replacement, but try a couple tricks.

First, if there are access panels to clean, clean it per the manual, it could be that a dirty filter or air inlet is confusing the thermostat.

Next, unplug the unit for at least 5 minutes, try it again.

Next set the unit on it's highest temp and blower setting, let it rip for 20 minutes, shut it down, unplug and remain unplugged for 5 minutes.

Next set the unit at 71 HIGH MODE.

see if we have a mode switch problem or thermostat if it works on high mode, it is not the thermostat, but I imagine it is, but I am curious as to if it once goes off, it never again comes back on?

Will

Could be the thermostat isn't working and the unit is just running and running all the time. To me that seems the most simple explanation right now. Can you check the temp inside when on the lowest setting for a day, then turn it up to the highest for a day and see if there is a huge difference in temps? Does the compressor motor ever turn off or does it run continuously? Suspect that t-stat...