WallynDianeExplorerMay 04, 2013Atwood water heater humming noiseI have a 2004 Holiday Rambler Presidential 5 th wheel rv. It has a six gallon propane/electric water heater. We just opened camp for the season and we noticed a humming sound (like a small motor runni...Show More
jimw606ExplorerMay 07, 2013I had a check valve that would buzz, but only when hot water was on and running.
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