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That Warning light, in the Type C of the model # ***** have stated at least, will turn On if temperature controls or sensors seem not to be working. Generally the flame should shut off at that point, for safety.
Is your flame going out when the Warning light comes On ?
It might be that the water line is clogged, or shut off, or otherwise there is a problem with the heat exchanger getting too hot owing to poor water flow. Those are things to check for anyway.