No lights, no display etc........
Loss of 12V DC power
Could be Main FUSE in DC Dist Panel is bad
OR
Could be High Temp Switch (thermofuse) on fridge burner stack has Opened (has reset button on sensor)
Or
Could be 5A DC fuse on circuit board (power module)
12V DC power comes from fused circuit in DC Dist panel to terminal block on backside of fridge. From terminal block it goes to/thru stack temp switch then to main power module.
Depending on which fuse is bad could be minor/could be major issue