Hotrodbob, on the hot/cold lines that you see coming out of the heater, do you also see a pipe running between them with a valve? If so, this is the water heater bybass, make sure this valve is closed.
2013 Jayco JayFlight 26RKS
2013 Ford F150 Ecoboost FX4
2003 Coleman Bayside / 2011 Jayco Jayfeather X20E -- RIP
2012 Tacoma Sport DCSB / 2013 Tundra SR5 - RIP