When you say no hot water, is there any water present at all? First locate your hot water heater cover on the outside and open it. Using the pop off valve, check if it has water coming from it when lifting handle. If no:
go to the inside of rv. The bypass valve will be at the opposite end from the pop off valve inside. Most likely in a cabinet. You will most likely have to remove a panel in the cabinet to get to the hot water heater from the inside. There will be three valves, water in, water out, bypass. open water in, water out, close bypass.
If yes: check for electrical switch on lower left corner and turn on.
Please note: DO NOT turn on electrical switch if water is not present in the hot water heater.
Flagstaff 8528 ckss fiver
2008 Ford f350 dually 4x4 desiel