No hot water
Hi, I have a 2019 Coachmen Catalina. Tried to use the hot water for the first time & I can not figure it out. The gas tank is open, the gauge/director on the line is facing the gas tank, hot and cold water valves on the tank are open, water in the tank. I turn on the DSI / water heater switch, it lights and stays lit. Gas is getting to to the stove, the burners light. The hot water burner is not igniting. What step am I missing? Thank you.