I've got the big brother to your machine, (An S-V co. model 4a Dr Pepper) and sounds to me your low on your freon charge, and it's causing the over temp/current breaker to trip (click) on & off as the compressor stuggles to keep itself and the cabinet cold, best have the pressure checked before you fry the windings '> also make sure the condensor fans still running, that'll overheat the compressor too. let us know how it goes!...JohnieG