Troubleshooting
Zone Ctrl II and
VAV Zone II Secondary Duct Installation and Start-up Guide
CARRIER CORPORATION ©2019
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If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
On
Obtain a Module Status Report (Modstat) to
determine which of the following occurred:
•
Exec halted after frequent system errors
•
Control programs halted
•
Zone Ctrl II stopped communicating with the
VAV Zone II Secondary Duct
5 flashes per second
On
Exec start-up aborted, Boot is running
5 flashes per second
Off
Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second,
alternating with
Run
LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second,
alternating with
Run
LED
Brownout
On
On
Failure. Try the following solutions:
•
Turn the Zone Ctrl II off, then on.
•
Format the Zone Ctrl II.
•
Download the Zone Ctrl II.
•
Replace the Zone Ctrl II.
NOTE
If you resolve the issue but the
Error
LED does not turn off, cycle power to the controller.
Possible delay before control program starts
•
When you first apply power to the Zone Ctrl II, it waits for up to 3 minutes to receive a time/date broadcast
from its BACnet router. The Zone Ctrl II begins to run the control program only after it receives the time/date
or when the 3 minute waiting period expires. If the Zone Ctrl II does not receive a time/date broadcast, it
keeps the default setting of 6/12/2002 10:00:00 (am).
•
The damper actuators' automatic full-range calibration on startup is staggered to prevent system high
pressure. This calibration delay is based on rotary switch addresses.
Delay = 20 x (rotary address mod 16) seconds. The minimum delay is 0 and the maximum is 300 seconds.
