The date stamp on a 4041/4040XP is on the packing nut. The date will be the week of the year and then the year.
EXAMPLE: 10 05 would be week 10 of 2005. For example...
A 4040SE would not hold the door open if it has :
No Voltage or Improper Voltage. Check that the track has proper voltage going to it (24V AC/DC or 120V AC).
If 120 volts is supplied...
ALL AD and CO products are warranted for electrical for 1.0 year after installation OR 2.0 years after manufacture.
The mfg date is on the lock stickers AND can be viewed electronically with th...