For our 236rl after calling Gulfstream directly & talking to the service department, it was the mystery switch & the tech just laughed. She said she gets calls all the time on it. For us it is the electric side to the hot water tank. We tested it out with out the gas side activated &boy did that water get Hot. The tech also stated not to turn it on unless there is water in the water tank or it will burn up. Hope it helps.
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