You have no voltage on the house 12 VDC buss. This means you have your house battery disconnect open (USE/STORE switch in STORE) or you have tripped the 50 amp DC breaker to the house buss.
Another possibility is completely dead house batteries if you camped with the disconnect open for a long time - the house batteries would not have been charged by the converter.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad