Section 4 Auto-Zone Plus
4-52 Start-Up and Troubleshooting
5.0 Start-Up
5.1 Blink Codes
The Zone Controller and the CV Controller use an on board LED to indicate various
diagnostic conditions during powerup and operation. The Zone Controller LED is labeled
“SCAN” and the CV Unit LED is labeled “COMM”. Starting with power up the LED
blink codes are as follows:
• Off for five seconds
• SCAN LED blinks the board address (Address 14 = 14 blinks)
• Five second pause
• Twenty second time delay - LED blinks twenty times
• LED stays on continuous during damper calibration (No damper calibration
on the CV Unit)
• Status code is repeatedly blinked every ten seconds to indicate controller
status:
Priority No. of Blinks Status
Lowest 1 Normal Operation
- 2 Override Active
- 3 Bad Zone or Airflow Sensor
- 4 Damper Failure
(Not used on CV Units)
Highest 5 Communication Failure
Table 4-1: Diagnostic LED Blink Codes
Only the highest priority failure code will be shown. You must correct the highest
priority alarm before other problems will be indicated.
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