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can you pull this away from the wall and go in behind it and listen for a click or buzz about every 2-3 minutes ?
I only hear the fan running
okay, the relay on the compressor has failed. these plug onto the side of the compressor, this starts the compressor. you will need to order and replace it to fix the issue. this is a common failure on these, if the fan beside the compressor in the back is running the compressor is getting power but the start relay has failed. theres a link below to order the part.