Refrigerator

I had a customer with your exact problem. Worked perfect on his week long trips. ALWAYS performed to spec when he left it at the Service center for over 3 weeks. He takes it home and then he calls within a few days stating the Lower section warms up. He stated it was level at his farm house concrete pad. We sent a driver out to verify his parking conditions and found he was NOT parked within the Norcold specs. What I found out was, BECAUSE the refer was operating correctly when he parked, the off level caused a reduction in flow of the cooling system. What confused us was WHY the refer DID NOT throw a NO CO code and shut the refer down which it should have. Found out the NO CO parameters would NOT work when the refer was already down to normal temps and then never turned off and then parked off level. Once he stabbed the jacks and leveled the RV within level specs he never had another problem. Sometimes a VISUAL for level is not that accurate. May NOT be your problem but your complaint points to this. Doug