Since I do not know what you have or have not done..... is water getting to your hot water heater? Did you flip your switch to use either 110 or LP? Did you wait long enough for hot water to be produced?
On my '15 27.1, I have an Atwood water heater, takes about 30 minutes to start getting heated water after letting it run a minute or so for the heated water to travel out the faucet.
U.S. Army Ret. '73 - '93
2015 ACE 27.1
When I turn on the water I always open the relief valve on the water heater to release trapped air and also to make sure that the water heater is full. I NEVER turn on the water heater until I check to be sure the tank is full of water.
Had a problem with my 2015 Thor Class A 36J. found there was 3 valves in the heater lines. 2 were visible but the bypass 1 was down below the heater. Followed lines and found valve below heater. Turned it and got hot water. Just look at the lines and you can probably see how the water bypasses the heater.