Three quick thoughts. First, did you try the lower 120 VAC receptacle (Those are sometimes wired such that ½ of it is on the inverter supply and the other ½ is on the shore power supply).
Second, did you test for the presence of 120 VAC on either or both of the AC outlets?
Third, can you or did you check the voltage on the 12 VDC power supply plug where it connects to the control module?
Any of these three could be the root of your problem. The reason for the question about the 12 VDC is that we had clicking in our practically brand new motorhome, and it turned out to be low DC at the refrigerator 12 VDC supply connection.
I would verify all three of those points to be good, to rule out problems "external" to the Norcold unit.
Good luck!!
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Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali
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