COMM FAIL Honeywell — Communication Lost / Controller Offline
At a glance
- Severity
- FAULT STOP
- Domain
- ACCESS_CONTROL
- Reference standard
- EN 60839-11 / CEI 79-18
What it means
The access control controller is not communicating with the management server. Doors continue to operate in offline mode (if configured), but events are not logged on the server and configuration changes do not reach the controller.
Probable causes
- Ethernet cable disconnected or switch port faulty
- Controller IP address in conflict or incorrect network configuration
- Network switch faulty or unpowered
- Access management server unreachable or service stopped
- Firewall blocking the controller communication port
Full guided diagnosis in the app
The diagnostic tree for this fault has 8 guided steps with measurements, checks and resolutions. You'll find it in BASIQ, one of the five IndexOS apps: free, works offline.
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More Honeywell codes
- COMM FAIL — Reader Offline / Reader Not Communicating
- TAMPER — Tamper Alarm / Controller Tampered
- ABORT ACTIVE — Suppression Release Failure
- ALARM ROUTING FAULT — Alarms Not Notified
- ALARM VERIFY — False Fire Alarm
- BAT FAIL — Battery Low / Battery Failure
- BAT FAIL — Fire Panel Battery Low
- COMM FAIL — Fire Panel Communication Error