Trane UniTrane User Manual

Diagnostics and Troubleshooting
146 UNT-SVX07J-EN
Entering water temp
failure
Invalid or missing value for zone
temperature.
•Fan Unaffected (enabled)
•Valves Unaffected
•Outdoor air damper Unaffected
• DX/electric heat Unaffected
Automatic
Discharge air temp low
limit
Discharge air temperature has fallen
below the Discharge Air Temperature Low
Limit.
•Fan OFF
•Valves Open
•Outdoor air damper Closed
• DX/electric heat OFF
Smart reset/manual
Discharge air temp
failure
1
Invalid or missing value for discharge air
temperature.
• Simplified zone control algorithm runs
• Unit shuts OFF if zone temperature fails
Automatic
Outdoor air temp failure
Invalid or missing value for outdoor air
temperature.
•Fan Unaffected
•Valved Unaffected
•Outdoor air damper Minimum
Position
• DX cooling/electric heat unaffected
Automatic
Humidity input failure
Invalid or missing value for relative
humidity.
•Fan Unaffected
•Valves Unaffected
•Outdoor air damper Unaffected
• DX cooling/electric heat Unaffected
Automatic
CO
2
sensor failure Invalid or missing value for CO
2
.
•Fan Unaffected
•Valves Unaffected
•Outdoor air damper Unaffected
• DX cooling/electric heat Unaffected
Informational
Generic AIP failure
Invalid or missing value for generic
analog input.
•Fan Unaffected
•Valves Unaffected
•Outdoor air damper Unaffected
• DX cooling/electric heat Unaffected
Informational
Local fan mode failure
Invalid or missing fan-speed switch
(reverts to default fan speed).
•Fan Unaffected
•Valves Unaffected
•Outdoor air damper Unaffected
• DX cooling/electric heat Unaffected
Automatic
Local setpoint failure
Invalid or missing value for zone
temperature setpoint (reverts to default
setpoint).
•Fan Unaffected
•Valves Unaffected
•Outdoor air damper Unaffected
• DX cooling/electric heat Unaffected
Automatic
Note:
1
For detailed information about zone temperature control methods, refer to “Zone Temperature Control,” p. 116
Table 86. Diagnostics generated by UC400-B controller (continued)
Diagnostic Probable Cause Consequences Diagnostic Type

Trane UniTrane Specifications

General

Brand	Trane
Model	UniTrane
Category	Heater
Language	English