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Old 03-30-2015, 04:55 PM   #11
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Join Date: Dec 2014
Posts: 126
That key pin is inserted into the ON side of the switch so that you cannot turn ON the switch if the key is inserted. It's a safety thing to prevent the rocker switch from being turned ON when there is no water in tank and therefore burning the heating element out. Normally used to store/winterize the RV. FROG FOREVER!!!!!!

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heater, hot water, suburban, water, water heater

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