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What year is your unit? Newer units use a two position valve to bypass the water heater for winterization. I presume that older units have a couple of valves behind the heater. Our heater selection switches are with the slide room switches etc behind a door inside the trailer.
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WillyM
2015 MS 38RSSA. 09 Ram Dually Diesel, 68RFE, 4.10.
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