The bypass valves are right behind the water heater. A lot of time the water heater is behind or under some cabinet, bench or something, and Jayco puts a single #2 square drive screw to secure the location closed. Go outside find the water heater, then look inside at that spot. You may need to remove a bench cushion (that is how I get to mine), sometimes there is a door that does not open.
Just have to look around, and do not be surprised you need a tool to access it. I removed the screw the first day, and it has never been put back.
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