Fridge beeping

We're plugged into shore power and tested to make sure that it was working by turning on lights and the microwave and everything works as it should. We set the fridge to AUTO and pressed ON and what we got was the flashing CHECK light and beeping. According to Dometic, a beeping noise means the doors are ajar, so we double-checked those and we evern double-checked to make sure that none of the shelves or drawers were blocking the doors in any way. Since the fridge couldn't connect to SP (couldn't find it/couldn't receive it) it transitioned over to LP and worked just fine. We checked all plugs and fuses and all look good. We even tried switching out the SP power cord to a more heavy-duty one that we had and that didn't make any difference either.