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McQuay OM 751 43
Diagnostics and Service
Condensate Overflow Indication (optional) (F4)
The Condensate Overflow Indication fault will occur when the UVC detects high condensate
levels within the units indoor coil drain pan.
Effect:
• Compressor is immediately de-energized if in cooling.
• Outdoor fan (if present) is de-energized.
• Fault is indicated.
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.