I don't know your coach but I would track down the strange sound and determine where or what is making the sound. Just a WAG, but I wonder if it is coming from your propane tank regulator or perhaps a bad gas valve or T somewhere along the gas line feed to your water heater. I you are getting these boards replaced under warranty by the Dealer ask them to check the gas pressure at the water heater gas valve.....or perhaps a good mobile tech might be worth the cost for a second (perhaps more experienced opinion).
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