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Few thins here, first of go to the outside access panel and look for that sensor, it will have a led on it. The reason I keep bringing this up is because if that led is on it will lock out the fridge. Inside that box is a reed switch, many times a magnet will reset it, bring a heavy magnet just in-case, if the LED is ON run the magnet right on top of the light, go slowly around the box.
I am familiar with the resets and it will depend on the style board you have, click HERE and HERE print them out and take them with you.
Make sure you also have good DC voltage going into the circuit board as well, the fridge needs good DC power to turn on. IF the code keeps coming back have a RV shop look at this.... Robert
IF you are satisfied with my efforts please feel free to select rating, it is the only way I get credit... Robert