Originally Posted by ColtronZ

It seems like mine defaults to whatever I left it on last. Just yesterday I switched it to recirculation for the first time and this morning it was still on that.

Edit: after posting this it went back to recirculation. Not sure how to fix, if you hold it down it flashes both lights.

Update: manual says, "To switch to the automatic control mode, push the control air intake button for approx 2 sec. The indicator lights will flash twice, then the air intake will be controlled automatically." I tried and couldn't get it to stick to the outside air setting.