Trying to make sure the freezer is working properly before I spend too much time and or money on it.

I just picked up a used freezer and it seemed to be cooling well. I noticed if I unpug it and then plug it back in, it would hum for a bit then click off. If I unpluged it again for a couple of minutes it would start up again just fine. I had similar results from turning the thermostat down until the compressor turned off, I would then turn it back up and I would get the hum and click, it would then start up again after I plugged it for a few minutes.

I had planned on using a PID to control the cooling to a specific temp and was checking the concept of the PID controlling the power to the unit.

Any help or suggestions would be greatly appreciated.

Thanks,