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On another forum, opening some/all of the how water faucets and running them for a while cured this.
Also, shutting down the water to the heater and draining it, then refilling, should replace the air cushion that prevents the whistle.
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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