hopefully you had water in the tank when you turned on the electric - I always verify this by lifting on the pressure relief valve to make sure water comes out.
when you click the button inside to turn the gas on - you should hear the heater make a faint clicking sound and then hear the flame kick on.
Did you purge the air out of the gas system before turning this on - I purge the air out of the lines by starting up my burners on the stove for a brief minute or two to make sure no air is in the line before starting the fridge.
you could have the bypass on causing no water to go into the trailer.
2011 Rockwood Mini Lite 2306 - Matt
2004 Dodge Ram 1500 Qaud Cab 4x4 with 35" tires and 3.92 gears, Dynatech Longtube Headers & Fabtech 6" lift + Superchips with shift Tuning
Nights Camped 2011 (37) - 2012 (16)-2013 (2) -2014 (5) -2015(0)
USMC 91 - 95 - F/A-18 Aviation Ordnance