Why Does a Honeywell VAV Controller Go Offline?
A Honeywell VAV controller appearing offline usually indicates a communication failure or power issue.
Common Causes
- BACnet communication loss
- Loose wiring
- Power supply failure
- Duplicate MAC address
- Controller firmware issue
Troubleshooting Steps
- Verify controller power supply
- Check network polarity and termination
- Confirm unique device address
- Restart controller and monitor status
Most offline issues are wiring-related rather than hardware failure.
FAQ
Should the controller be replaced immediately?
No. Confirm communication and power before replacing hardware.