Trane Tracer AH540 User Manual

CNT-SVX05B-EN 93
Chapter 7
Troubleshooting
Use Table 64 through Table 70 to assist you in diagnosing any of the fol-
lowing operational problems that you might encounter with the Tracer
AH540/541 controller:
• Fans do not energize
• Valves stay closed
• Outdoor air damper stays open
• Outdoor air damper stays closed
• DX cooling binary outputs do not energize
• Electric heat binary outputs do not energize
Table 64. Fan outputs do not energize
Probable cause Explanation
Power-up control wait When power-up control wait is enabled (non-zero time), the controller remains Off
until one of two conditions occurs:
The controller exits power-up control wait when it receives communicated
information.
The controller exits power-up control wait when the power-up control wait time
expires.
Unoccupied operation When the controller is in the unoccupied mode, the fan is cycled between high speed
and Off with capacity to maintain zone temperature control.
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.
Diagnostic present Specific diagnostics affect fan operation. For more information, see Table 63 on
page 91.
No power to the controller If the controller does not have power, the unit fan does not operate. For the 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 fan may not work correctly.
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. Refer to “Performing a manual output test”
on page 84.
Unit wiring The wiring between the controller outputs and the fan relays and contacts must be
present and correct for normal fan operation.

Trane Tracer AH540 Specifications

General

Brand	Trane
Model	Tracer AH540
Category	Controller
Language	English