It should be on the water heater itself. If it's a Suburban it's on the lower left portion of the WH panel. If you can't push the switch it could have a locking pin that needs to be removed.
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2014 Georgetown 351DS
-TruCenter -Front/Rear CHF -Hellwig Links -Tiger Trak -Ran McNally GPS -ScanGauge -Truck Systems TPMS -5 Star Tune
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