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Troubleshooting
Troubleshooting
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...
Power
Rx
Tx
CW
CCW
The Run and Error LED's indicate controller and network status.
If Run LED shows...
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
5 flashes per second
5 flashes per second
7 flashes per second
14 flashes per second
VVT Bypass Controller
Installation and Start-up Guide
Status is...
The VVT Bypass Controller has power
The VVT Bypass Controller is receiving data from the network segment
The VVT Bypass Controller is transmitting data over the network segment
The actuator motor is turning clockwise
The actuator motor is turning counterclockwise
And Error LED shows...
Off
2 flashes,
alternating with Run LED
3 flashes,
then off
1 flash per second
On
On
Off
7 flashes per second,
alternating with Run LED
14 flashes per second,
alternating with Run LED
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24
Status is...
Normal
Five minute auto-restart delay after system error
The controller has just been formatted
The controller is alone on the network
Exec halted after frequent system errors or
control programs halted
Exec start-up aborted, Boot is running
Firmware transfer in progress, Boot is running
Ten second recovery period after brownout
Brownout
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