We are traveling and had a similar problem. The thread called "next to no water at faucets" helped us out. Our filter in the water connection compartment had come loose. After tightening it, we needed to prime the pump again. This is the suggestion we found - I still could not get the unit to prime, I then connected a water hose to the supply and opened a faucet, turned the pump on and then moved the valves to bypass winterization mode, this forced water into the pump and lines. ran this way for 10 seconds. Turned everything off and reset to tank supply and away we went, no issues after that. - and it worked for us. Hope this helps. Just keep searching this site - there's a wealth of knowledge and experience here!