Is your water heater an Atwood or Suburban? I have an Atwood in my Eagle and to my knowledge there is no "reset" button for the electric side, just a circuit breaker. You might check to make sure the switch inside is functioning properly. On my previous camper which had a Suburban, the reset switch/button was located on the outside part of the water heater. Just open the exterior panel and it was right there.
2012 Eagle 320 RLDS
2012 Ford F-250 Crew Cab FX4, 6.7l PSD
3.55 E-locker, Timbrens