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Jon Elson[_3_]

wrote:

When the alarm is activated the 24VDC is removed from the coils and the
doors are supposed to be automatically pulled closed by the force of the
pneumatic unit. This doesn't always work

Try putting one layer of wide vinyl tape over either the electromagnet or
the door plate. (A couple parallel strips of ordinary electrician's tape
could also be used to test this idea.) If it now releases, remanent
magnetic field is certainly the problem. Possibly you could get a thin
durable material that could permanently replace the tape, which will
eventually wear down and cause the problem to recur.

Jon