VMCW
Your need to place a wattmeter across the line for a minimum measurement of 800 watts. This will tell you is the refrigerator is doing any work For a DIY diagnosis, listen for a hum-click in intervals when the compressor tries to start. If it hums and clicks our on overload, the problem is a faulty compressor or starting relay.
My two cents
deerrr
25- year service professional