Instruction manual
OM 751-4 42 www.DaikinApplied.com
dIaGnostICs and serVICe
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.
EPROM Memory Indicator (ee)
The EPROM Memory Indicator occurs when an unusual electrical event has scrambled
the EPROM memory within the controller board. In the event that this happens, the
controller board must be replaced.
Conguration Display (--)
The Conguration Display occurs when the display le “**.cfg” is incorrect or has not
been downloaded with the appropriate le from service tools.