124 UNT-SVX07B-EN
Diagnostics
Troubleshooting Tracer ZN010, ZN510, and ZN520
Red SERVICE LED
During normal operation, the LED is off continuously when power is applied to the controller.
If the LED is on continuously, even when power is applied to the controller means that someone
is pressing the SERVICE button or that the controller has failed.
If the LED flashes once every second, use Rover™, Trane’s service tool, to restore the unit to normal
operation. Refer to the Rover™ product literature for more information.
Note: If the Service button is held down for more than 15 seconds on the Tracer ZN520 controller,
it will uninstall itself from the ICS communication network and shut down all unit operation.
Green STATUS LED
During normal operation, the LED is on continuously.
If the LED blinks once, the controller is in Manual output test mode.
If the LED blinks twice the controller is in Manual output test mode, with one or more diagnostics
present.
If the LED blinks (1/4 second on, 1/4 second off for 10 seconds) the controller is in the “Wink” mode.
Note: The “wink” feature allows the identification of a particular controller. When sending a
request from a device, such as Rover™, the controller will “wink” to indicate it received the
signal.
If the LED is off, either the power is off, an abnormal condition is present or the TEST button is
pressed.
Yellow COMM LED
If the LED is off continuously, the controller is not detecting any communication. This is normal for
units in standalone applications.
If the LED blinks, the controller detects communication.
If the LED is on continuously, this indicates an abnormal condition.
Green STATUS LED
Indicates Whether the
Controller is Powered On
(24 Vac Supplied)
Yellow COMM LED
Indicates if
Communication is
Functioning
Red SERVICE LED
Indicates if Service is
Needed
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