hey i just got the spectapure electronic top off unit at exotic for $189 karen said it was the best (the owner of exotic) and having problems setting the probe never had an ro/di top off system before always toped off manually. the directions state to insert the probe and pull up until you hear a click then pull up again until you hear a 2nd click and that would be your set point but i dont hear the secound click. please help !!