Their should only be "one by-pass valve". Their should only be "one inlet valve" And, there should only be "one outlet valve" Closing the inlet valve to the water heater should stop (cold water/antifreeze) from entering the water heater. If it is entering the water heater stop and inspect this valve for proper operation.
However if all else fails.... Winterize the RV and then drain and flush the water heater with your wand.... thoroughly….
Leave the zinc rod/drain plug off and allow the tank to dry out.
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Don & Donna Stout
E-9 Anchor Clanker
Full timers since 2010
2017 North Point 381 DLQS
2015 F-250 6.7 w/Timbrens
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