this is the compressor clicking on off.
I`m sorry to say ! Which means the compressor is bad .
Most sealed system repairs for refigeration systems will cost $400-500 for parts and refigerant plus labor .
This is designed as a disposable unit .
Which means if something goes wrong ,they just want you to buy another one .
This unit does not even have replacement parts available
Sorry But they make almost everything now day to just be thrown away .
Thank you ,happy holidays