With city water turn off and water pump turn on, does the water pump cycle on when it not suppose to ( no water is being used but the water pump start running)? If so the check valve in the water pump might be bad. On my first RV I took my water pump apart and cleaned it and it worked fine.
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Mark
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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