Hi Campingfun, I have a 2006 Jayco jayfeather sport 186. You probably have the Atwood 6 gallon lp only water heater. Try cleaning the tube with a water heater brush. When lighting hold knob on pilot for at least 20 seconds then put on on and turn thermostat up. It should fire.
George & Barbara
2012 Toyota Tundra dbl cab 4x4 5.7 V8
2006 Jayco Jay Feather Sport 186