There's usually a house style Off/On switch that powers the heater. Check that didn't get accidentally flipped (I mention it because mine was on the bed stand and that's exactly what I did several times while making the bed over the first year I owned my first RV). That switch is also a good place to check that there's power before and after the switch.
In my 2nd RV, it was up over the power control center in the hallway. It was unmarked and had a twin which turned out to be the On/Off for the block heater. That one also was a mystery for a while until I guessed that it HAD to be the water heater element. I laugh at myself now, but back then, I didn't have the time while traveling to figure out what it was or where my water heater element power was coming from.
And of course, there will be a Circuit Breaker involved, along with, in some RVs a CGFI, so if you have several outlets near water that are out, or an odd one that's by itself, be sure to get that checked or test it yourself.
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