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
downtheroadExplorerMay 04, 2013Just thinking...have you flushed out the heater tank recently? If not, it might be full of 'crud.'
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