As long as the controller has power to it and the switches haven't been triggered the pump is on. When something turns the pump off it stays off for at least 6 minutes. Too often my abalone would block the overflow and cause the tank's water level to rise too high. By having the return pump shut off for 6 minutes the abalone will leave the overflow and go back down into the tank.
My old ACIII didn't have statements like Defer and Fallback so on many of my Apex programs I haven't bothered using them although I suppose I should. Fallback is only for if your display module looses contact with the power bar. Like Poontang said, you should add 'Set ON' and then you wouldn't need to manually turn it back on.
All of this is explained quite well in the Comprehensive Users Manual which you can find on Neptune's website.
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