There are two boards on Dometic refers. The main control noard and an eyebrow board. The eyebrow board is the one with the buttons on it. If the refer is powering on then I suspect cooling unit failure. But before going there you need to check for power at the electric heating element. Its rare but possible it is burned out. Look really closely and smell the back of the refer. Any yellowish residue or stains or any smell of ammonia means the cooling unit has sprung a leak. Rvcoolung unit warehouse has them for your refer for $655. New.