On the bottom left ( outside) just above the power switch, there are two round black rubber covered circles. They are over temp snap disc switches. Push each one. If one of them snaps, it had tripped and is now reset. Then try again. If they are OK, You may have burned up the heating element, by applying power when the WH tank was empty. Easy to do if WH is left on after a trip and you plug RV in to clean at home.
2015 Freedom Express 248RBS
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TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels