What model Norcold?
They are pretty simple machines. My guess is you've lodged a piece of ice in the mechanism somewhere. I never "chipped" away the ice from the freezer. When it came time to defrost, I would empty the freezer then use hot water and a turkey baster to douse the ice. Once loosened, it's easily removed.
You'll most likely need to disassemble the ice maker to see if there's a piece of ice lodged inside. An alternative would be to shut the fridge off and allow it to self defrost, then restart it. I don't know if that's feasible if you're using the coach....Dennis