Troubleshooting
VVT Bypass Controller
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
All rights reserved
24
If you have problems mounting, wiring, or addressing the VVT Bypass Controller, contact Carrier Control
Systems Support.
NOTE
To help you troubleshoot, obtain a Module Status (Modstat) from the controller and review the System
Error and Warning details.
LED's
The LED's on the VVT Bypass Controller show the status of certain functions. Verify the LED patterns by
cycling power to the controller and noting the lights and flashes.
If this LED is on...
Status is...
Power
The VVT Bypass Controller has power
Rx
The VVT Bypass Controller is receiving data from the network segment
Tx
The VVT Bypass Controller is transmitting data over the network segment
CW
The actuator motor is turning clockwise
CCW
The actuator motor is turning counterclockwise
The
Run
and
Error
LED's indicate controller and network status.
If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes per second
2 flashes,
alternating with
Run
LED
Five minute auto-restart delay after system error
2 flashes per second
3 flashes,
then off
The controller has just been formatted
2 flashes per second
1 flash per second
The controller is alone on the network
2 flashes per second
On
Exec halted after frequent system errors or
control programs halted
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
Troubleshooting
