The Card Reader Turns Green but the Door Stays Locked

Separate the decision from the result

A card reader turning green while the door stays locked separates an authorization indication from a physical result. Trace the decision, output, lock supply, hardware movement, and re-securing sequence before choosing software, electrical, or door-hardware corrections.

A Reddit technician described a Lenel opening where a reader remained lit and a controller relay clicked after power returned, yet the door did not unlock. This supports separating an apparent command from physical release. It does not establish that the indicator was green, that authorization was correct or that a particular part had failed.

Record whether the event log says granted or denied, whether a relay or lock responds, and whether the door is physically under pressure. These observations locate different parts of the failure without requiring an occupant to open control panels.

Source: Lenel 1320 S two readers

Trace the opening as a system

The path includes credential, reader communication, controller decision, output, lock power, hardware movement, and door position feedback where installed. Axis controller documentation treats these as separate inputs and outputs. A door-contact sensor reporting open or closed is also different from evidence that the bolt or strike released.

Have qualified personnel check electrical and mechanical functions against the selected hardware instructions. Do not increase voltage, extend unlock times indefinitely, or defeat monitoring to make a reluctant door appear operational.

Source: AXIS A1001 and AXIS Entry Manager

Check supply, output logic and pressure against the latch

Allegion’s Von Duprin 6100/6200 guidance distinguishes model-specific 12 VDC and 24 VDC solenoids and calls for checking voltage under load at the strike. The wrong supply type or inadequate delivered voltage can prevent release even when a controller output changes. These values belong to those models; they are not permission to apply a higher voltage to an unknown strike.

The same guidance identifies preload: pressure from the latch against the strike can obstruct internal movement. Adams Rite also explains how pressure can prevent release. Door alignment, seals or building pressure therefore belong in the investigation. A technician should use the actual hardware instructions rather than treating a longer unlock duration as a cure.

Check the approved wiring and output logic as well. Normally open and normally closed contacts describe different relay states, and the intended state must match the lock’s operation. Axis documentation distinguishes its relay-open locked and relay-open unlocked settings. These are qualified diagnostic checks, not a request for occupants to jumper terminals or bypass exit functions.

Source: Allegion: Von Duprin 6100/6200 Electrical and Mechanical Release Checks · Adams Rite: Understanding Electric-Strike Preload · AXIS A1001 and AXIS Entry Manager

Illustrative scenario: pressure on a storefront door

Imagine a valid badge produces an access-granted log but the strike does not release until someone relaxes pressure on the door. The credential database is doing its job. Door alignment, loading, hardware suitability, or installation may be the limiting factor.

The service scope should include the relevant door professional rather than treating every failure as a software issue. After correction, test normal entry without requiring users to pull or push in an unusual sequence.

Source: AXIS A1001 and AXIS Entry Manager

Prove the whole event

Use authorized test credentials and record grant, physical release, opening, closing, and re-securing. Test the intended traffic conditions and accessibility requirements through the responsible team. Review alarm events so a corrected release problem does not leave false held-open notifications.

The final report should identify the failed stage and correction. Repeatedly issuing remote unlock commands until the door happens to open is not reliable acceptance evidence.

Source: AXIS A1001 and AXIS Entry Manager

Put it into practice

A decision table to keep handy