My state select electric water heater,just stop working and I don't know how to bringing back to work,any ideas.

my state select electric water heater,just stop working and i don't know how to bringing back to work,any ideas.
First go to the breaker box and check for a tripped breaker. If you have power to the heater open up the upper inspection plate and hit the red reset button on the upper thermostat. If that don't get it you'll have t6o track it down with a AC volt meter. Good luck and let me know. Tom