[Chester Stone]

Before retiring at night, I flip the switch that locks the outside air door from the inside and a red light comes on next to the switch.  With this switch disengaged, the outside door numerical lock and door open button work correctly, but only for awhile.  If I lock the door from the outside and return within a few hours, it unlocks and works normally.  If I leave for a long time and return, the numerical lock does not work, the inside lock is actuated and the only way I can open the door is the use the air release valve in the bay next to the door.  Hopefully someone can lead me to a solution.