Put in a new Jandy 1.5Hp, 2-speed, 240-volt pump. Previous pump was a 2Hp single speed 230-volt pump. Because I'm going to do a wiring upgrade later I decided to just hook up the HIGH speed. So I connected Line 1 to terminal #1 of the pump, and Line 2 to terminal #2 of the pump. Pump terminal #3/4 is not used. Pump does not run - nothing. Checked voltage: 124v between Line 1 and Grd; 124v between Line 2 and Grd; Zero volts between Line 1 and Line 2. Seems as if there should be 240+ volts between Line 1 & 2. What could be wrong - I'm not an electrician! Anyone with electrical knowledge that could point me in the right direction - that surely would be appreciated. Thanks again!