Our 2005 was similar in that the switch alternated between the fireplace and the microwave. They were both on the same circuit which doesn't have the capacity to run both at the same time. In your case it switches between the 125v element in the water heater and the microwave. The water heater should still function on gas even with the switch off
Mike
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Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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