Access control door not locking

Customer reported an access controlled door that would not lock. The door was remotely released by a button operating an electric strike. Although the door could be unlocked remoted it was necessary to walk to the door lock it closed every time.

Chubb 3R35

If you know what you’re looking at you can tell why the lock shown below would not close without intervention. The lock is not designed for use with an electric strike. It is a Chubb 3R3F, which is a variant of the Chubb 3G110 detainer lock. These locks are unusual that they use a system of linkages between the bolt and the levers. The bolt stump does not directly locate into the levers. They are one of the hardest mortice locks to pick and give very little feedback.