Instruction manual

www.DaikinApplied.com 41 OM 751-4
dIaGnostICs and serVICe
Space Coil DX Temp Sensor Failure (f5)
The Space Coil DX Temp Sensor Failure fault occurs when the UVC detects open or
short conditions from the sensor.
Effect:
• Compressor immediately de-energizes.
• Outdoor fan (if present) de-energizes.
• 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.
• Compressor immediately de-energizes.
• 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.
• Compressor immediately de-energizes.
• Outdoor fan (if present) immediately de-energizes.
• Fault is indicated.
Outdoor Coil DX Temp Sensor Failure (f8)
The Outdoor Coil DX Temp Sensor Failure fault occurs when the UVC detects open or
short conditions from the sensor.
Effect:
• Compressor immediately de-energizes.
• Outdoor fan (if present) de-energizes.
• 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.
• Dehumidication 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.