The Dometic RM1350 E0 error code means:
No communication between display and power modules. The control system will revert to full automatic operation selecting the best energy source available with AC first and GAS being second priority. The temperature setting will be maintained at the mid position. The power module will continually attempt to reestablish operation of the display module. Test control cable between upper and lower control, control (on-off) panel and lower board, clean all grounds, and try a different DC power source. If problem still exists change lower control board.
https://www.dometic.com/assets/47/43...3.pdf?att=true