Auto-Zone CV & CV-EX
Section 4
Start-Up and Troubleshooting 4-17
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 CV is the CommLink jumper set for single loop operation? See Figure 4-3
♦ For CV-EX systems is the CommLink jumper set for multiple loop operation? See
Figure 4-3
♦ 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 4-7.
♦ Are the CV Controllers powered? Check 24 VAC to the controllers.
♦ 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.
♦ Are the CV Controllers powered? Check 24 VAC to the controllers.
♦ Is the REC LED on the missing CV Controller “flickering”? See Figure 4-6 for
location of the REC LED.
♦ Is the COMM LED on the CV Controller blinking an error code? See the Blink Code
chart.
♦ Are Comm Loop voltages correct at the missing unit? See the Comm Loop trouble-
shooting section.
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