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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
Содержание UniTrane
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