Helped a friend replace his worn out impeller today. Tried running test but no water out the exhaust ports(no pee hole). Ran it in a makeshift test tank where the water covered the holes in lower unit but not totally submerged( is this the prob. ?) Disassembled again looking for obstruction, found none, impeller correctly installed(clockwise). <br />Will try new t-stat in AM but old one checked out fine(measured in pot of water on stove with temp. gauge, fully open at 130 degrees). Any suggestions Force wrenchs?<br />Thanks in advance.. 