Access Control Troubleshooting Hub
Troubleshooting hub for readers, controllers, electric strikes, maglocks, REX and door monitoring faults. Use this page as a starting point before moving to a specific wiring diagram.
Safety note: Troubleshooting should be done within your competence. Isolate power where required and follow the manufacturer instructions for the actual equipment.
General troubleshooting workflow
Confirm the symptom
Reproduce the fault and identify whether it affects one device, one circuit, one cabinet or the whole system.
Check power first
Verify mains, power supply, PoE, battery, fuse and polarity before changing programming.
Check cabling and terminations
Inspect labels, patching, pinout, continuity, distance and environmental damage.
Check configuration
Confirm addressing, zones, relay mapping, VLANs, recording schedules or user permissions.
Document the fix
Update the as-built notes so the same fault can be diagnosed faster in future.
Common problems
- Reader powers up but will not read: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- Card reads but door does not unlock: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- Maglock will not release: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- Door held open alarm: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- REX button not working: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- OSDP reader offline: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- Wiegand reader intermittent: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
- Fire release not operating: start with power, cable continuity, device status, programming and the relevant diagram before replacing hardware.
Quick checks before replacing parts
Physical checks
- Cable seated and labelled correctly
- Correct voltage or PoE class available
- No water ingress, crushed cable or loose terminal
- Correct polarity where DC or bus wiring is used
Configuration checks
- Correct device address, IP or zone number
- Correct relay, lock, siren or output assignment
- Correct user permission or schedule
- Correct gateway, DNS or cloud/app registration where relevant
Relevant product categories
Access controllers, readers, strikes, maglocks, REX buttons and related door hardware can be reviewed at SecurityWholesalers.