Auto-Zone Control Systems Auto-Zone Basic Systems Installation & Operation (Version 02C) - Manual (Page 121)

Auto-Zone Basic Section 4
Start-Up & Troubleshooting 4-19
Troubleshooting
The following is a guide to assist in troubleshooting the Auto-Zone Basic Control Sys-
tem. It is provided as a systematic approach in determining and resolving common sys-
tem problems.
Troubleshooting Checklist
Begin troubleshooting by locating the general problem in the list below. Detailed compo-
nent troubleshooting information follows later in this section.
Zone is too warm
• Is cooling locked out due to outside air temperature?
• Is cooling short cycling due to low supply air temp cut-off?
• Is zone calling for cooling?
• Is supply air temperature indicating cooling?
• Is Economizer enabled?
• Is Economizer opening?
• Is cooling being held off by its minimum off timer?
• Is the zone a “voting” zone?
• Is the system currently trying to satisfy a higher heating demand?
• Is the rooftop unit running? Check internal safeties.
• Is the Zone Damper operating freely?
• Is the LED blinking an error code? See Table 4-1.
Zone is too cool
• Is heating locked out due to outside air temperature?
• Is heating short cycling due to high supply air temp cut-off?
• Is zone calling for heating?
• Is supply air temperature indicating heating?
• Is heating being held off by its minimum off timer?
• Is the zone a “voting” zone?
• Is the system currently trying to satisfy a “higher” cooling demand?
• Is the rooftop unit running? Check internal safeties.
• Is the Zone Damper operating freely?
• Is the LED blinking an error code? See the BLINK CODE chart.