The pressure relief valve on my water heater began leaking badly. Today was the day to replace the valve. The valve was replaced in about 5 minutes, but it still leaked when water pump was turned on. The pump was shut off, then switched on and it stayed off until I opened a faucet, it came on but would not shut off after faucet was closed, and water heater relief valve began leaking. I then did what no one should do, I disabled the pressure relief valve for a only a couple of minutes, when it was cold, same problem. Very important, I then made the pressure relief valve active again and removed the water pump for inspection. I connected a continuity tester through the pressure switch and pushed the pressure switch by hand, no change. I then turned the set screw all the way counter clockwise, and it seemed to work. Re-assembled the pump, all is good. I never thought a water pump would have enough pressure to open a pressure relief valve, boy was I wrong. A call to SHURflo, I found there is a two year warranty, so I am putting in for a replacement. With the set screw all the way counter clockwise, I can't get an even flow of water from pump, but it works for now.