I was not shown either, I just figured it out the hard way…..
Inside the coach you have a switch, pretty simple, water heater..on or off. When you turn it on it will try to ignite via LP. The LP sensor on the floor level must be on, LP on, LP available....etc.....if it cannot ignite after several minutes it will turn red (on my unit) and then you can reset it and it will eventually ignite and heat the water using LP.
If you want to use electric, you have to open the cover on the outside of the unit, and set the switch to on, Now it will use electric....and a lot of it. I always set it to on when I am parked and plugged into a 50 amp service.
If both the AC units are on, and the water heater is on, a hair dryer will blow the 50 amp circuit. Simple.....turn the water heater off until the hair is done....
hope this helps.....enjoy.....
2009 Charleston FR
Fort Worth, TX
Jeep Wrangler Toad