Presumeably you have a little white panel with some push buttons on it to read battery, black tank, gray tank, galley tank. The botom of this panel has two red rocker switches, one labled pump and one Htr... this is the gas control for the water heater.
Off its dark. When you turn it on, it lights up red, and a red spot apears just to the right of it that later goes out. The spot is the igniter fireing up the propane.
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