Trane BCVC, BCHC, BCXC-SVX01B-EN manual Diagnostics, Troubleshooting, LED Activity

Diagnostics

Troubleshooting

LED Activity

Red Service LED

The red LED normally indicates if the unit controller is operating properly or not. Refer to Table 36.

Table 36. Red service LED activity‘

LED activity	Description
Off continuously after power is applied to the controller.	Normal operation
On continuously, even when power is first applied to the	Someone is pressing the Service button or the controller
controller.	has failed.
LED flashes about once every second.	Uninstall (normal controller mode). Use Rover™ service
	tool to restore normal unit operation.
Black Service push button.	Use the Service button to install the Tracer™ ZN520
	controller in a communication network.

Green Status LED

The green LED normally indicates whether the controller is powered on (24 VAC supplied). Refer to Table 37.

Table 37. Green status LED activity

Green LED activity	Description
On continuously	Power on (normal operation).
Blinks (one blink)	The controller is in manual output test mode.
	No diagnostics present.
Blinks (two blinks)	The controller is in manual output test mode.
	One or more diagnostics are present.
LED blinks (1/4 second on, 1/4 second, off for 10 seconds)	Wink mode.(a)
LED off	Power is off.
	Controller failure.
	Test button is pressed.

(a)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 10 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. Refer to Table 38.

Table 38. Yellow comm LED activity

LED activity	Description
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.
	High traffic on the link.

Note: If the service push button is held down for more than 15 seconds, the Tracer™ ZN controller will uninstall itself from the ICS communication network and shut down all unit operation. This mode is indicated by the red Service LED flashing once every second. See the Red

72 BCXC-SVX01B-EN