Fridge requires 12VDC to function on AC or GAS
Does the upper display come on...interior light come on?
remove exterior access/vent cover so you can check the backside of fridge
Need to verify you have 12VDC to the terminal block/to circuit board
Then you will have to remove the cover on circuit board and check the FUSES on circuit board
3A Fuse.....above the J4 terminal on circuit board is for the DC
*Comes from the DC Terminal Block
5A Fuse.....above the J5 terminal on circuit board if for the AC
*Comes from the AC Power Cord
http://bryantrv.com/docs2/docs/operating/ndr1292.pdf