Ever since we brought the Grizz home from the dealership, we’ve noticed little to no water pressure when using the coach in “disconnected mode”. Pump runs, but no water. Also, everything works great when we are connected to campground water. All of the appropriate switches and knobs appeared to be in the right positions, and the pump runs, but no water.
It hasn’t been a big deal, since we hadn’t done any boondocking, and have always stayed at a park. We did some moochdocking in northern Idaho a short time ago, and it became an issue. So, I brought the Grizz up to the house (from storage) and did some sleuthing.
Previously, I had found a seemingly random hose that just flopped down from behind the panel in the wet bay. Since things were working on shore water, but not on the pump, I assumed this “random” unhooked hose was the cause of the problem. I tried to trace it out by sticking my fat head below the panel, but no go. I couldn’t see where the hose went. The end that was still attached just went off above the freshwater tank.
So, I got Grizz up to the house, and proceeded to take the lower panel off in the wet bay. Multiple looks, and still couldn’t see where this hose was supposed to connect. I even borrowed by my sons' snake camera, and still nothing.
I double checked all the knobs and switches, and all good. Test, bad. Time to trace every piece of pex behind the panel. I traced every single line behind that panel, including the direction of water flow.
What this led me to be the Normal/Winterize knob on the front panel. The knob was currently in the “Normal” position, which should mean that the water pump should be pumping water. However, the current position of the knob was contrary to what I had found by tracing the Pex behind the panel.
Yup, you got it. The labelling on the panel was reversed. I turned the knob to Winterize, and lo, the water began flowing. I immediately went inside and found all faucets working properly and the toilet flushing with no problem. Turns out the mystery hose was simply the air inlet/exhaust for the freshwater tank.
Moral of the story: if you buy a used RV, don’t trust any labels placed by the previous owner.