Originally Posted by sallemann
Are you sure you don't have the hot water tank bypassed? If it is bypassed, there may be no water in the tank at all and the hot water heater will shut itself off.
My first thought too, and something I would check out right away, before you try to light it again. The propane burner can survive this, but it puts lots of wear on it. If the tank is empty, and you turn on the electrical element to heat the water, it will burn out the element. (I don't care to discuss how I know this either