When I said the bypass valve may be open a little, I meant the valve that goes between the inlet and outlet of the waterheater in/under the kitchen cabinet(in my case).Of course the inlet and outlet valves of the waterheater must!!! be open,just look at the waterheater from the inside.
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Siggy & Ursula.
2011 Newmar DSDP 4020 , (No DEF, 07 emission),
FTL XCR Chassis , Cummins ISL 400 HP
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