Auto-Zone Control Systems Auto-Zone Basic Systems Installation & Operation (Version 02C) - Manual (Page 120)

Section 4 Auto-Zone Basic
4-18 Start-Up and Troubleshooting
Blink Codes for Zone Controllers
The Zone Controller uses an on board SCAN LED to indicate various conditions during
power up and operation. Starting with power up, the SCAN LED blink codes are as fol-
lows:
• Off for 5 seconds
• SCAN LED blinks the board address (Address 14 = 14 blinks)
• 5-second pause
• 20-second time delay - LED blinks 20 times
• LED stays on continuously during damper calibration
• Status code is repeatedly blinked every 10 seconds to indicate controller
status:
Priority Number of Blinks Status
Lowest 1 Normal Operation
- 2 Override Active
- 3 Bad Zone or Airflow Sensor
- 4 Damper Failure
Highest 5 Communication Failure
Table 4-1: SCAN LED Blink Codes
Only the highest priority failure code will be shown. You must correct the highest prior-
ity alarm before other problems will be indicated.