They probably intend the air pump to shut off at night, so that you don't have too much moisture during your night cycle. If you can't get the auto option to work, before you go out of town, manually set the timer until you have more time to play with it. I have some, with this option, but I don't use it.
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: Jasen
------ON THE NEVER-ENDING JOURNEY TO CURE THE 'EPIPHYTIC ITCH'--------
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