If you plugged into shore power with the water heater on & empty the heating element is done for.
In a 7+ year old water heater it's also possible the element has lived our it's lifespan. Pull it out & take it to about any hardware store for a matching replacement.
If it's a Suburban brand take the black cover off of the the reset buttons & check the wiring to the thermostats, it's been an issue that the cover pinched the wires against the tank shorting them out.
BE SURE TO DISCONNECT SHORE POWER BEFORE HAND!
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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