Troubleshooting

Table 34. Reversing valve output does not energize

Random restart timer

Explanation

 

 

Power up control wait

All controller outputs remain off until the timer expires.

 

 

Selected mode OFF, FAN

Reversing valve held in current state because compressor use is not allowed.

ONLY

 

 

 

Diagnostic present

A specific list of diagnostics affects compressor operation. For more information, see the Diagnostics section in the

 

manual.

 

 

No power to the

If the controller does not have power, the reversing valve does not operate. For the controller to operate normally, it

controller

must have an input voltage of 115 or 208-230, 265 VAC.

 

 

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 reversing valve may not be energized. Refer to

 

the Manual Output Test section.

 

 

Unit wiring

The wiring between the controller output and the reversing valve must be present and correct for normal operation.

 

 

Normal operation

PTHE unit is in heating mode.

 

 

Diagnostic present

A specific list of diagnostics affects unit operation. For more information, see the Diagnostics section in the manual.

 

 

Table 35. Auxiliary heat output does not energize

Probable cause

Explanation

 

 

Random restart timer

All controller outputs remain off until the timer expires.

 

 

Selected mode OFF

When off is selected at the display to the controller, the unit controls all outputs off.

 

 

Selected mode FAN

When fan only is selected at the display to the controller, the unit only allows the indoor fan to energize.

ONLY

 

 

 

Diagnostic present

A specific list of diagnostics affects unit operation. For more information, see the Diagnostics section in the manual.

 

 

No power to the

If the controller does not have power, the compressor does not operate. For the controller to operate normally, it

controller

must have an input voltage of 115 or 230/208, 265 VAC.

 

 

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 auxiliary heat may not be on. Refer to the

 

Manual Output Test section.

 

 

Unit wiring

The wiring between the controller output and the auxiliary heat must be present and correct for normal operation.

 

 

Indoor Coil Freeze

The compressor has been turned off because the indoor coil temperature has fallen below 35°F and has not risen

protection

above 50°F.

 

 

Normal operation

Auxiliary heat may not be needed to meet the load conditions see the section dealing with Auxiliary Heat Control.

 

 

Defrost Cycle

During the active defrost cycle the auxiliary heat is controlled off. See the section on defrost control. Reversing

 

Valve output does not energize.

 

 

Table 36. Ventilation output does not energize

Probable cause

Explanation

 

 

Random restart timer

All controller outputs remain off until the timer expires.

 

 

Selected mode OFF

When off is selected at the display to the controller, the unit controls all outputs off.

 

 

Diagnostic present

A specific list of diagnostics affects unit operation. For more information, see the Diagnostics section in the manual.

 

 

No power to controller

If the controller does not have power, the compressor does not operate. For the controller to operate normally, it

 

must have an input voltage of 115 or 230/208, 265 VAC.

 

 

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 ventilation output may not be on. Refer to the

 

Manual Output Test section.

 

 

Unit wiring

The wiring between the controller output and the ventilation must be present and correct for normal operation.

 

 

Normal operation

See the section on Ventilation operation.

 

 

Defrost Cycle

During the active defrost cycle the outdoor fan is controlled off. See the section on defrost control.

 

 

PTAC-SVX01C-EN

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Trane PTAC-SVX01C-EN manual Reversing valve output does not energize, Auxiliary heat output does not energize
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