Panic Hardware error codes, explained
Exit devices and push bars — Von Duprin, Sargent, Precision and similar. Codes below: Latching, dogging, and egress-code guides. Each guide covers what the code means, what you can safely try yourself, when to stop and call a technician, and what the repair typically costs.
Panic bar / exit device won't latch
Two causes cover most cases. First, the 'dogging' feature is engaged — a hex-key or key cylinder setting that intentionally holds the latch retracted so the door works push/pull during business hours; if someone dogged it and forgot, the door will never latch. Second, strike misalignment from a sagging door or loose mounting. One serious caveat: if this is a FIRE-RATED door (check the label on the door edge), it must positively latch and must not have mechanical dogging at all — a fire door that can't latch is a code violation, not an inconvenience.
What that hex key hole in your panic bar does (dogging, explained)
'Dogging' holds the exit device's latch retracted so the door operates as simple push/pull during business hours — no latching, easy traffic flow. It's engaged with a hex key (or a key cylinder on better hardware, which gives you control over who can dog the door). The critical rule: fire-rated exit devices must NOT have mechanical dogging — fire doors need an active latch to hold back smoke and fire, so labeled fire exit hardware ships without it, and the code-compliant way to get the same convenience is electric latch retraction that releases on the fire alarm.
Before anyone chains, blocks, or 'fixes' an exit door — the law
The rule, straight from the building code (IBC 1010.2, mirrored by NFPA 101): egress doors must be openable from the inside without a key, special knowledge, or effort, in not more than ONE motion. Chaining a problem panic bar shut, wedging it, adding a keyed deadbolt above it, or blocking it with storage all violate fire code — and in assembly spaces of 50+ people, panic or fire exit hardware is essentially the only legal latch. Delayed-egress (15-second) hardware exists, but only as specifically listed equipment — it's not a DIY workaround.