Don't have that feature on my 2016 Siesta but I think that switch is to turn the water pump on when using the outside shower and must turn off on time or when the water is turned off there. The main water pump switch is located inside.
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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