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Old 11-08-2010
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Join Date: Dec 2007
Location: Ridgewood
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I am leaning towards a sticky check valve since it seems to be OK when using the pump, but not on shore water. On shore water the pressure is likiley higher than when using the pump, and more steady. A higher pressure pushing against the check valve flow might cause it to stick. The slow hot water might indicate the check valve in the hot water system. I don't have a diagram for your coach, but I would expect a check valve on the hot water heater supply side, and possibly one on the output side. Just a guess!

A leaky fill valve would effect all water pressure, not just the hot.
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