York YCAV0157 Installation Operation & Maintenance page 287

TABLE 27 contains the fault and inhibit code with
it's associated meaning to be used for decoding ISN
Operational and Fault Codes on ISN Pages 57 and 59
in Table 26.
TABLE 27 - FAULT AND INHIBIT CODES
CODE TYPE
1 Unit
2 Unit
3 Unit
4 Unit
5 Unit
6 Unit
7 Unit
8 Unit
9 Unit
10 Unit
11 Unit
12 Unit
13 Unit
14 Unit
15 Unit
16 Unit
17 Unit
18 Unit
19 Unit
20 Unit
21 Unit
22 Unit
23 Unit
24 Unit
25 Unit
26 Unit
27 System
28 System
29 System
30 System
31 System
32 System
33 System
34 System
35 System
36 System
JOHNSON CONTROLS
ISN FAULT AND INHIBIT CODES
SOURCE
Panel
Panel
Panel
Panel
Panel
Panel Invalid Number of Compressors Selected
Panel
VSD Pre-charge Low DC Bus Voltage
VSD Pre-charge DC Bus Voltage Imbalance
VSD
VSD
VSD
VSD
VSD
VSD
VSD
VSD Motor Current Overload (Hardware)
VSD
-
-
-
-
-
-
-
-
Panel High Discharge Pressure (Software)
Panel
Panel
Panel
Panel
Panel
Panel
Panel
Panel
Panel
The table also classifies each fault/inhibit as a unit or
system type and lists which board (Chiller Control
Board (panel) or VSD Logic Board) generates the
fault/inhibit.
FAULT or INHIBIT CODES
Low Ambient Temp.
High Ambient Temp.
Low Chilled Liquid Temp.
SPARE 0
Low RTC Battery Voltage
VSD Communications Failure
High DC Bus Voltage
Low DC Bus Voltage
DC Bus Voltage Imbalance
High VSD Ambient Temp.
Single Phase Input
VSD Power Supply Fault
VSD Logic Board Fault
CT Plug Fault
SPARE 1
SPARE 2
SPARE 3
SPARE 4
SPARE 5
SPARE 6
SPARE 7
SPARE 8
High Differential Oil Pressure
Low Differential Oil Pressure
Low Suction Pressure
High Discharge Temp.
High Oil Temp.
Low Suction Superheat
Sensor Failure
Low Motor Current
High Motor Temperature
FORM 201.21-NM1 (1223)
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