5.3 Modulating Chinook System Fault Codes
Display Code Diagnostic Description
1 Long Run Time
2 System Pressure Trip
3 Short Cycling
4 (L4) Locked Rotor
5 (L5) Open Circuit
6 (L6) Open Start Circuit
7 (L7) Open Run Circuit
9 Low Secondary Voltage
11 Failed Ignition
12 Low flame sense current
13 Flame lost after established
14 Flame present with gas valve off
21 (L21) Low pressure switch trip
22 Main limit switch open
23 Auxiliary limit switch open
25 Condensate Overflow
26 Line Neutral Reversed
27 Check Line Voltage
28 High Line Voltage
29 (L29) High pressure switch trip
30 Fuse open
33 MRLC open
Display Code Diagnostic Description
44 Low press. switch closed (inducer off)
45 Low press. switch open (inducer high)
46 Low press. switch open (inducer low)
55 High press. switch closed (inducer off)
57 High press. switch open (inducer high)
60 Blower fault run
61 Blower fault no run
62 Check inducer and blower motors
66 RPM out of range (Over 1200 RPM)
68 No blower communication
71 No inducer control communication
77 No gas valve feedback
78 Servo contol fault
79 No gas valve feedback
80 Low airflow
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
Please refer to equipment instructions for additional fault information.
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