Originally Posted by Ford Idaho
Get a #2 square bit drive and pull the screws out.
X2, there are several models of TT's where you do have to remove the bunk plywood to access the bypass valves. It's just the design of it.
On mine, you have to remove some screws to a fake hinge on a fake cabinet door to access the rear of my water heater and the bypass valves.
When you do gain access, and if you have the three valve setup (you could have one or just two), you will want them as in the pic for normal use. Yours are probably in the bypass mode, also shown in the pic.:
I'm sure you know not to try and operate the water heater without water in it. This FAQ may help explain further:
Suburban's electric switch and much more