water tank and heater

I have a 2019 179 and the water heater is accessible through an outdoor black panel/door, firstly you should verify that the water heater is filled with water before turning any heating source either gas or electric by opening the pressure relief valve on the tank and ensure that you have a water flow.  The system has to be under pressure either by the city water connection hooked up or by running the fresh water pump and having water available for the pump in the fresh water tank.  Once you verify that there is water in the hot water tank you can then heat it via propane gas or electric (or both).  To turn on the gas heat flip the switch for the water heater on the panel inside the trailer located on the same panel as the tank level indicator lights and battery condition lights and a switch to turn the fresh water pump on and off.  If you want to use the 120v electric heating element verify that the breaker is in the on position (and not tripped) then go outside to the water heater and find the small rocker off/on switch (mine is located in the lower left hand side of the water heater) and turn that switch on.  If you still are not getting hot water by using the electrical element you may have to push the reset buttons (one for gas and one for electrical) on the water heater (on mind) below and to the left of the pressure relief valve and above and to the right of the off/on rocker switch.  There is a black rubber panel with 2 clearly marked reset push buttons, push both buttons in.  After doing all that if you still can't get the electric heating element to work follow offgrid's instructions on how to test and or replace the heating element.  Hope this helps.