Auto-Zone Control Systems Auto-Zone CV-C Controller Installation Guide (Version 01A) - Manual (Page 13)

Auto-Zone CV-C Section 2
Sequence of Operation 2-3
Comm LED Diagnostic Comm LED Diagnostic Comm LED Diagnostic Comm LED Diagnostic
Blinks
Blinks Blinks Blinks
As mentioned earlier, the COMM LED will blink a diagnostic code every 10 seconds
during normal operations. If this LED is off continuously or on continuously, there is a
total failure in the controller and it should be replaced. The diagnostic blinks are
described below in order of priority. The highest priority condition must be corrected
before any lower conditions can be observed and corrected. 1 Blink is the lowest priority
and 5 blinks is the highest priority.
1 Blink Normal operations. No alarm conditions
2 Blinks Pushbutton Override is active during Unoccupied Hours.
3 Blinks Zone Temperature Sensor failure detected.
4 Blinks Not Used in this Controller
5 Blinks RS-485 communications lost