Installer’s Guide 39
SYSTEM FAULT CODES
Please refer to equipment instructions for additional fault information.
Display Code Diagnostic Description
71 No inducer control communication
77 No gas valve feedback
78 Servo control fault
79 No Gas Valve Feedback
80 Low Airflow
81 Return air sensor out of range
82 Supply air sensor out of range
83 Coil Temperature Sensor Fault
84
Outdoor Ambient Temperature
Sensor Fault
Display Code Diagnostic Description
85 Freeze protection
86 Air Freeze protection
P Compressor Protector Fault
d1 No Shared Data
d3 Insufficient Indoor CFM
d4 Memory Card Invalid
d5 Card Hardware Conflict
d6 Blower Horsepower Conflict
d7 Blower Manufacturer Conflict
d8 Old Shared Data
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