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What is the model number of this fridge? It will be on the inside wall on the data tag. It should begin with "RM" and some numbers. Get back to me with this and I can help you sort this out.
I am attaching a link to the Dometic Service Manual that is used for this model. Print it out as there is a bunch of good information in there. See page 40 for the error codes. This one has to do with the AC heater not being available. That can be for a number of reasons. A breaker that is tripped or a blown fuse on the control board or a bad heating element. Testing here with a small digital multimeter can track this down. About $20 or so at most hardware stores and easy to use. I can direct you in some testing. http://bryantrv.com/docs2/docs/Service%20Manual,%20RM1350.pdf
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?