38 CNT-SVX11A-EN
Troubleshooting
Probable cause Possible Explanation
Unit wiring The wiring between the controller outputs and the fan contactor must be present and correct
for normal fan operation
No power to the controller If the controller does not have power, the unit fan does not operate. For the Tracer ZN524 Unit
Controller to operate normally, it must have an input voltage of 24 VAC. When the green LED is off
continuously, the controller does not have sufficient power or has failed.
Unit configuration The controller must be properly configured based on the actual installed end devices and application.
When the unit configuration does not match the actual end devices, the fans may not work correctly.
Random-start observed After power-up, the controller always observes a random-start from 5 to 30 seconds. The controller
remains off until the random-start time expires.
Power-up control wait When power-up control wait is enabled (non-zero time), the controller remains off until one of two
conditions occurs:
1. The controller exits power-up control wait once it receives communicated information.
2. The controller exits power-up control wait once the power-up control wait time expires.
Diagnostic present A specific list of diagnostics affects fan operation. For more information see, Table 19: Tracer ZN524
Unit Controller diagnostics, page 33.
Manual output test The controller includes a manual output test sequence you can use to verify output operation and
associated output wiring. However, based on the current step in the test sequence, the unit fan may not
be on. For more information see, Manual Output Test, on page 32 for more information.)
Fan mode off When a local fan mode switch (provided on the Trane zone sensor) determines the fan operation, the off
position controls the unit off.
Requested mode off You can communicate a desired operating mode (such as off, heat, and cool) to the controller. When off
is communicated to the controller, the unit controls the fan off. There is no heating or cooling.
Unoccupied operation When the controller is in the unoccupied mode, the fan is cycled.
Cycling fan operation/continuous The controller can cycle fan with unit capacity. If no capacity is present, the fan will be de-energized
Table 19:
Fan Outputs do not energize
Fans
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