I have a Norcold N811 fridge, and just recently (within the past day or so) has decided to stop working on A/C power, but works wonderfully on LP. When the unit stops working on A/C power, both the freezer and fridge stop working, with no error codes. Switch to LP and both fridge and freezer start to cool down again. Any advice on how to troubleshoot this would be approximated. Thanks.