285
JOHNSON CONTROLS
FORM 201.21-NM4 (616)
285
JOHNSON CONTROLS
8
ISN FAULT AND INHIBIT CODES
TABLE 27 contains the fault and inhibit code with
its associated meaning to be used for decoding ISN
Operational and Fault Codes on ISN Pages 57 and 59
in Table 26.
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.
TABLE 27 - FAULT AND INHIBIT CODES
CODE
TYPE
SOURCE
FAULT or INHIBIT CODES
1
Unit
Panel
Low Ambient Temp.
2
Unit
Panel
High Ambient Temp.
3
Unit
Panel
Low Chilled Liquid Temp.
4
Unit
Panel
SPARE 0
5
Unit
Panel
Low RTC Battery Voltage
6
Unit
Panel
Invalid Number of Compressors Selected
7
Unit
Panel
VSD Communications Failure
8
Unit
VSD
Pre-charge Low DC Bus Voltage
9
Unit
VSD
Pre-charge DC Bus Voltage Imbalance
10
Unit
VSD
High DC Bus Voltage
11
Unit
VSD
Low DC Bus Voltage
12
Unit
VSD
DC Bus Voltage Imbalance
13
Unit
VSD
High VSD Ambient Temp.
14
Unit
VSD
Single Phase Input
15
Unit
VSD
VSD Power Supply Fault
16
Unit
VSD
VSD Logic Board Fault
17
Unit
VSD
Motor Current Overload (Hardware)
18
Unit
VSD
CT Plug Fault
19
Unit
-
SPARE 1
20
Unit
-
SPARE 2
21
Unit
-
SPARE 3
22
Unit
-
SPARE 4
23
Unit
-
SPARE 5
24
Unit
-
SPARE 6
25
Unit
-
SPARE 7
26
Unit
-
SPARE 8
27
System
Panel
High Discharge Pressure (Software)
28
System
Panel
High Differential Oil Pressure
29
System
Panel
Low Differential Oil Pressure
30
System
Panel
Low Suction Pressure
31
System
Panel
High Discharge Temp.
32
System
Panel
High Oil Temp.
33
System
Panel
Low Suction Superheat
34
System
Panel
Sensor Failure
35
System
Panel
Low Motor Current
36
System
Panel
High Motor Temperature
