www.DaikinApplied.com 39 OM 752-4
dIaGnostICs and serVICe
Space Temp Sensor Failure (f0)
The Space Temp Sensor Failure fault occurs when the UVC detects open or short con-
ditions from the sensor.
Effect:
• Space fan de-energizes (unless in emergency heat mode).
• Outside air damper is forced closed.
• Electric heat stages are de-energized.
• Fault is indicated.
Outdoor Temp Sensor Failure (f6)
The Outdoor Temp Sensor Failure fault occurs when the UVC detects open or short
conditions from the sensor.
Effect:
• Outside air damper is forced closed.
• Fault is indicated.
Discharge Air Temp Sensor Failure (f7)
The Discharge Air Temp Sensor Failure fault occurs when the UVC detects open or
short conditions from the sensor. Emergency heat mode is available during this fault
condition.
Effect:
• Space fan is immediately de-energized (unless in emergency heat mode).
• Outside air damper is forced closed.
• Electric heat stages are de-energized.
• Fault is indicated.
Space Humidity Sensor Failure (optional) (fa)
The Space Humidity Sensor Failure fault occurs when the UVC detects open or short
conditions from the sensor.
Effect:
• IA/OA Enthalpy comparison economizer (if used) is disabled.
• Dehumidication function (optional) is disabled.
• Fault is indicated.
Outdoor Humidity Sensor Failure (optional) (fb)
The Outdoor Humidity Sensor Failure fault occurs when the UVC detects open or short
conditions from the sensor.
Effect:
• IA/OA Enthalpy comparison or OA Enthalpy economizer (if used) is disabled.
• Fault is indicated.
Space CO
2
Sensor Failure (optional) (fc)
The Space CO
2
Sensor Failure fault occurs when the UVC detects open or short con-
ditions from the sensor.
Effect:
• CO
2
Demand Controlled Ventilation function is disabled.
• Fault is indicated.
Change Filter Indication (ff)
The Change Filter Indication fault occurs when the UVC calculates that the total fan run
time has exceeded the allowed number of hours since the last lter change.
Effect:
• Fault is indicated.
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