I purchased used, had to clean up and replace the plug (ground prong had broken off)..... It's been running for several days, and will not cycle off. Temps in freezer and fridge appear to be good (though I have not measured). Door seals appear to be ok, and light does turn off when closed. There is no visible frost in the freezer, but I haven't pulled the freezer panel off. Where are the refrig coils in this model? There is a panel on the back of this refrig, thinking coils are behind the panel. I turned the refrig and freezer settings to high setting (warmest possible) to see if this would cycle it off, still nothing. I am thinking it's a bad thermostat, but not sure. If I need to measure temps, where can I get a thermometer for this purpose? Should I try cleaning the coils and/or getting a better door seal before I replace parts? If you could direct me to a p/n for thermostat, if that is a potential part that needs replacing....

I pulled the thermostat out today and brought it home, stuck it inside freezer at home and ran continuity check. It checked out fine, pulled it out and after about 4-5 minutes, heard switch click to break contact, and infinite resistance..... So, from what I can tell the thermostat is working. I got a thermometer, will turn everything back on and put that in the freezer and see what temp it gets down to. What setting (middle maybe) should I test to see if temp gets to 0-5 F range? There is nothing in the freezer, a 1 gallon container of water in the refrigerator..... I'll also check the evap fan and coils.... I do know compressor fan runs. Thanks for the help!!!

So I finally got a chance to work on this some more... I noticed the evaporator fan was not running, so I gave the fan a nudge and got it going, appears as if it was stuck. Ran for a couple hours today with no problems. Prior to getting the fan going I ran the unit for a day and measured the freezer temp and it was just below 0 F. So even with the evap fan not running, it got the freezer to 0 F. Refrig. compartment was probably not as cold as it should be since fan was inoperative. I did notice some light frost on the top evaporator coils, and light frost on the tubing to the evap coils, nothing significant, but a light coating of frost. If the thermostat was working properly, shouldn't it have cycled everything off since the freezer got that cold? Before I order a new thermostat, what are the chances that's actually the problem? Like I said in an earlier post I did measure resistance across thermostat leads, and it was opening and closing, but I'm thinking it could still be defective and maybe not opening/closing in the correct temp ranges.... Any suggestions would be appreciated. I don't want to spend a lot of time or $ on this since it is for a rental property that's currently vacant. If parts are more than about $75 I think I'll just buy a new refrigerator. I was thinking about just ordering a new thermostat and trying that, if that doesn't resolve, then I'll just buy a new refrig. Do you know how old Magic chef model CTB1521ARW is?

I stopped over the house today and the refrigerator is now cycling on and off. The evap fan appears to have been the problem. I'll keep an eye on it for another week and if all appears good I'll consider resolved. I'm wondering if I really need to replace the evap fan motor or if it was just stuck..... Refrig was in storage for awhile..... This website is great, a tremendous help!!!