40 CNT-SVX11A-EN
Troubleshooting
Probable cause Possible Explanation
Unit wiring The wiring between the controller outputs and the end devices must be present and correct for normal
operation.
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 unit may not work correctly.
Diagnostic present A specific list of diagnostics affect compressor and electric heat operation. For more information see,
Table 19, page 35 for more information.
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 DX or electric
outputs may be off. For more information see, Manual Output Test, on page 32 for more information.)
Normal operation The controller energizes the outputs only as needed to meet the unit capacity requirements.
Table 22:
Compressor or electric heat output(s) do not energize
DX/Electric Heat
Probable cause Possible Explanation
Unit wiring The wiring between the controller outputs and the outdoor air damper must be present and correct for
normal damper operation.
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 damper 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 outdoor air operation. For more information see, Table 19
on page 35 for more information.)
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 damper
may not be open. 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 and damper to close.
Table 23:
Outside air damper stays closed
Outside Air Damper
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