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BAS-SVX48H-EN
Automatic— Non-Latching
Automatic diagnostics clear automatically when the problem that generated the diagnostic is
solved.
Smart Reset
Smart Reset Diagnostics are latching diagnostics that auto-recover if the condition is corrected.
After the UC400 Controller detects the first smart reset diagnostic, the unit waits 30 minutes
before initiating the smart reset function. If another diagnostic of this type occurs again within 24
hours after an automatic clearing, clear the diagnostic manually by using any of the ways listed
under the section above, Manual (Latching) Diagnostics.
Informational
Informational diagnostics provide information about the status of the UC400Unit. They do not
affect machine operation, but can be cleared from the unit using the BAS or Tracer SC.
Diagnostic Generated by the UC400
The table below lists each diagnostic that can be generated by the UC400 Controller, the
diagnostic effect on outputs (consequences), and diagnostic type.
NNoottee:: The generic binary output is unaffected by diagnostics.
Table 11. Diagnostics
Diagnostic
Probable Cause
Consequences Diagnostic Type
Filter Change Required Fan run hours exceed the time set to indicate filter change.
• Fan Unaffected
• Valves
Unaffected
• Electric Heat
Unaffected
Informational
Condensate Overflow The drain pan is full of water.
• Fan OFF
• Valves Closed
• Outdoor Air
Damper Closed
• DX/Electric Heat
OFF
Manual
Low Coil Temp Detection The leaving fluid temperature may be close to freezing.
• Fan OFF
• Valves Open
• Outdoor Air
Damper Closed
• DX/Electric Heat
OFF
Smart reset/Manual
Low Airflow Supply Fan Failure The fan drive belt, contactor, or motor has failed.
• Fan OFF
• Valves Closed
• Outdoor Air
Damper Closed
• DX/Electric Heat
OFF
Manual
Space Temperature Failure Invalid or missing value for zone temperature.
• Discharge Air
Temperature
Control Runs
• Unit Shuts OFF if
Both Space
Temperature and
Discharge Air
Temperature Fail
Automatic
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