So, we just had this exact problem. Dometic DM2882, no lights on the control board, and won’t work on electric or propane. We checked the fuses inside the cabin of the RV, but all those fuses and CB’s were good and reset. After some research, we learned of the 3Amp and 5Amp fuses behind the fridge. You access these from the panel on the outside of the RV. The 3 amp fuse was good but the 5 amp was obviously blown. We were excited that this should fix it, but it didn’t. Still no power! So, with the help of google and more YouTube, we learned about the thermofuse and thermal switch. The thermofuse is in-line between the 12vdc terminal board and the exhaust. That wire has a black heat shrink around it and is tucked away. After disconnecting the wire from the thermal switch, and sliding back the heat shrink, I removed the thermofuse from the wire and twistes the two wire ends together. I reconnected power and the battery, and it worked!! The thermofuse was the culprit, preventing the needed 12vdc from getting to the circuit board.
