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CNT-SVX05A-EN
Troubleshooting
Green Status LED
The green Status LED is normally used to indicate whether or not the controller
is powered On (24VAC).
Table 52 — Green Status LED activity
Green LED activity
LED is on continuously.
LED blinks (one blink).
LED blinks (two blinks).
LED blinks (1/4 second on,
1/4 second off for ten seconds).
LED off.
Note 1: During manual output test, certain diagnostics make the status LED light in a two-blink pattern. Refer to the
diagnostics table for a list of two-blink diagnostics. If a two-blink pattern remains after an attempt to clear diagnostics,
the diagnostic condition is still present and may affect the manual output test. The diagnostic must then be cleared
using another method. Refer to the section on Resetting diagnostics.
Note 2: The Wink feature allows you to identify a controller. By sending a request from Rover service tool, you can
request the controller to wink (blink on and off as a notification that the controller received the signal). The green LED
blinks (1/4 second on, 1/4 second off for ten seconds) during Wink mode.
Yellow Comm LED
The yellow Comm LED blinks at the rate the controller receives communication.
The yellow LED does not blink when the controller is transmitting
communication data.
Table 53 — Yellow Comm LED activity
Yellow LED activity
Description
LED off continuously.
The controller is not detecting any communication
(normal for standalone applications).
LED blinks or flickers.
The controller detects communication (normal for communicating
applications, including data sharing).
LED on continuously.
Abnormal condition or extremely high traffic on the link.
Manual output test
The manual output test sequence (Table 53) verifies output and end device
operation. The manual output test can be conducted to verify output wiring
and actuator operation without using the Rover™service tool.
Many service calls are initiated due to unit diagnostics, so the test sequence
attempts to clear unit diagnostics and restore normal unit operation prior to
testing the outputs. If the diagnostics remain after an attempt to clear
diagnostics, the status LED lights in a two-blink pattern, indicating the
diagnostic condition is still present and may affect the manual output test.
See the Diagnostics section for information on which diagnostics cause a two-
blink pattern.
Manual output test can also be useful for air balancing or water balancing.
As shown in Table 53, Step 4 of the manual output test opens the cool valve and
Step 5 opens the heat valve for water balancing. Step 4 can also be used for air
balancing. This step opens the cool valve, opens the outdoor air damper to the
minimum occupied position, and controls the duct static pressure at the duct
static pressure setpoint.
Manual output test can be terminated by advancing completely through the test
sequence. The controller will time out if the unit remains in a single step for ten
hours.
Description
Power on (normal operation).
The controller is in manual output test mode. No diagnostic present.
The controller is in manual output test mode.
One or more diagnostics is present (Note 1).
Wink mode (Note 2).
Power is off.
Controller failure.
Test button is pressed.
65
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