The problem sounds like a breaker or fuse but that leads to a second problem as those power feeds are not on the panels, etc. that Winnebago adds in many cases!
My guess might be to look at info to spot where there are fuses on the HWH equipment itself, rather than on the "normal" Winnebago places!
It might be thought of like we might find in many things at our house. There is the big breaker box but the problem may be on some other item like the TV and a fuse may be there?? It took me a bit to find I had a blown fuse on my recliner!
But getting the correct HWH(if that brand) can get you the right info to find that fuse. If not a fuse that info is defitely the place to look for truly good troubleshooting info.