The diverter valve--one of those 3-way types? Either one direction or the other?
If there is a check valve in the water line to the water heater, it should be directly behind the heater itself where the line connects.
Let us know what you find to fix it.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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