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If the fan on the backside is not spinning it could be a bad fan-motor. When the fan runs the compressor should run as well. If the compressor is not running the fan should not be running either, so you should unplug it for about an hour, then plug it back in and see if the compressor unit starts up. If it doesn't, it is probably something wrong in the control circuit for the compressor. It could be the thermostat (check that it is set correctly). If the compressor starts up but the fan does not run, it is most likely a bad fan motor or bad wire leading to the fan motor.
The fans are controlled with a clixon that has a cut in at 5 degrees, and cut out at 20 degrees. If the unit is running and the fans are not comng on then I would have to say you are out of freon. But your condensor fan could be running and the compressor NOT be running which could be a problem with your compressor. Find out if your compressor is running by taking an amp draw. If compressor IS running then you are low on freon. If the compressor is running and your evaporator coil is cold and your fans AREN'T coming on then your clixon is bad.
You just answered your question. If no fan is running then the compressor will overheat and the compressor goes off on overload. Do you have the evaporator fan running? If yes then replace the condensor fan. Both fans will run at the same time. If the evap fan is not running then the unit must be in defrost. Since its a hotgas defrost the compressor will run.
Hope this helps
If you are talking about the freezer fan motor, it should be running if the compressor is running. if the compressor runs without the fan running the compressor will overheat and become damaged.
The mullion heater in the door divider is not affected by the compressor.
This sounds like it is caused by either a high pressure reset. Or the compressor is tripping a high temperature limit internally. One thing you may be able to do is to hose off the coil surface with a garden hose on the outside (condensing unit) this would allow the operating pressure to drop if it is dirty.