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Timer controlled doors - 

Sometimes we find the front doors and others unlocked at a time when they are supposed to be locked.  It makes us believe that the time has been changed.

There is a way to tell.  Look at the swiper.

• If the swiper is RED, the timer thinks the doors are locked.  If they are supposed to be locked, that means that someone opened the doors with a key and did not relock them.
• If the swiper is GREEN, the timer has unlocked them.