Auto-Zone Control Systems Auto-Zone CV & CV-EX Systems Installation & Operation (Version 01C) - Manual (Page 96)

Section 4
Auto-Zone CV & CV-EX
4-18 Start-Up and Troubleshooting
Troubleshooting
The following is a guide to assist in troubleshooting the CV and CV-EX systems. It is
provided as a systematic approach to determining and resolving common system
problems.
General Communications
No CV Units are communicating
Is the CommLink connected and plugged in?
For the CV System, is the CommLink jumper set for single loop operation? See
Figure 4-4.
For the CV-EX System, is the CommLink jumper set for multiple loop operation?
See Figure 4-4.
Are Comm Loop voltages correct? See the Comm Loop troubleshooting section.
Is the Comm Loop open or shorted?
Are the CV Controller address switches set correctly? See Figure 4-8.
Are the CV Controllers powered? Check 24 VAC to the controllers. The PWR
LED should be lit.
Is the Communications Loop shorted? Check Comm Loop voltages.
Is the System Manager connected to the Communications Loop?
Some CV Units are communicating, but others are not
Are the CV Controller address switches set correctly? See the addressing chart
(Figure 4-8.)
Are the CV Controllers powered? Check 24 VAC to the controllers. The PWR
LED should be lit.
Is the COMM LED on the missing CV Controller “flickering”? See Figure 4-7
for location of the COMM LED.
Is the LED2 on the CV Controller blinking an error code? See the Blink Code
chart on the next page.
Are Comm Loop voltages correct at the missing unit? See the Comm Loop
troubleshooting section.