Auto-Zone Plus Section 4
Start-Up and Troubleshooting 4-53
5.2 General Troubleshooting
The following is a guide to assist in troubleshooting the Auto-Zone Plus System. It is
provided as a systematic approach to determining and resolving common system
problems.
5.2.1 Trouble Shooting Checklist
Begin troubleshooting by locating the general problem in the list below. Detailed
component 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 it’s 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 Table 4-1.
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