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RLDriver,
My understanding is that Norcold, like Dometic, uses a "THERMISTER" to control the on/off cycling of the cooling unit. If the thermister (a tiny transister that opens and closes a circuit based upon temperature) is not working, it will keep the circuit closed, thus making the cooling unit constantly running, thus in turn freezing in the refrig compartment. Any dealer should be able to diagnose and fix the problem. The thermister itself usually costs about 15 to 20 dollars. The wire runs from the electronic circuit board through the wall (usually back wall) of the refrig, then into the compartment. I just replaced mine myself on my Dometic to solve exactly the same problem as you had.
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