You don't mention if this is RV is new to you or if it has been working and just stopped.
Not familiar with your specific RV, but generally the water heater switch is located inside the coach, usually near the water pump switch, but some manufacturers like to play hide and seek with the switches for some reason. Sometimes they are labeled with the words water heater, but sometimes they aren't. Some have a picture of a flame and they often have a red light either integral to the switch or next to it.
Forgive me if you already know all this, but as I said you didn't give any background. If you know where the switch is and you're sure its on, the next step would be to check for blown fuses in the DC fuse panel. If the switch is on and all fuses are good, then there's some real trouble shooting to do. Assuming you have power to the control board and the unit is switched off and then back on, you should hear attempts to ignite the burner.
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Current RV Information: 2018 Forrest River Salem Hemisphere 282RK
Previous RVs: 2004 Fleetwood Bounder 32W; 1999 Four Winds Five Thousand 21RB; 1986 Allegro Bay 27'
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