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7.6.1 - General/major alarms
JBus
code
Alarm
code
Alarm description
Reset type
Action taken
Possible cause
THERMISTOR FAILURE
1
15001
Evaporator entering water thermistor fault
Automatic, if thermistor
reading returns to normal
Unit shuts down
Defective thermistor
2
15002
Evaporator leaving water thermistor fault
As above
Unit shuts down
As above
3
15010
OAT thermistor fault
As above
Unit shuts down
As above
5
15011
Master/slave common water thermistor fault
As above
Master/slave operation is
disabled and the unit returns to
the stand-alone mode
As above
6
15012
Suction gas thermistor fault, circuit A
As above
Circuit A shuts down
As above
7
15013
Suction gas thermistor fault, circuit B
As above
Circuit B shuts down
As above
8
15015
Discharge gas thermistor fault, circuit A
As above
Circuit A shuts down
As above
9
15016
Discharge gas thermistor fault, circuit B
As above
Circuit B shuts down
As above
10
15018
Condenser subcooling liquid thermistor fault, circuit A
As above
Circuit A shuts down
As above
11
15019
Condenser subcooling liquid thermistor fault, circuit B
As above
Circuit B shuts down
As above
16
15021
Space temperature thermistor fault
As above
None
As above
4
15023
Evaporator heater feedback thermistor fault
As above
None
As above
14
15024
Economizer gas thermistor fault, circuit A
As above
Circuit A shuts down
As above
15
15025
Economizer gas thermistor fault, circuit B
As above
Circuit B shuts down
As above
12
15033
Compressor motor thermistor fault, circuit A
As above
Circuit A shuts down
As above
13
15034
Compressor motor thermistor fault, circuit B
As above
Circuit B shuts down
As above
TRANSDUCER FAILURE
17
12001
Discharge transducer fault, circuit A
Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down
Defective transducer or
installation fault
18
12002
Discharge transducer fault, circuit B
As above
Circuit B shuts down
As above
19
12004
Suction transducer fault, circuit A
Automatic (three alarms in
the last 24 hours) or Manual Circuit A shuts down
As above
20
12005
Suction transducer fault, circuit B
As above
Circuit B shuts down
As above
21
12010
Oil pressure transducer fault, circuit A
Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down
As above
22
12011
Oil pressure transducer fault, circuit B
As above
Circuit B shuts down
As above
23
12013
Economizer pressure transducer fault, circuit A
As above
Circuit A shuts down
As above
24
12014
Economizer pressure transducer fault, circuit B
As above
Circuit B shuts down
As above
25
12024
Water pressure 1 transducer failure (before the pump)
As above
Circuit A shuts down
As above
26
12025
Water pressure 2 transducer failure (after the evaporator)
As above
Circuit B shuts down
As above
27
12029
Low water pressure
Automatic
None or unit and pump shut
down
Water loop pressure
too low, risk of pump
cavitation
28
12031
Condenser subcooling liquid pressure transducer, circuit A
As above
Circuit A shuts down
Defective transducer
29
12032
Condenser subcooling liquid pressure transducer, circuit B
As above
Circuit B shuts down
As above
COMMUNICATION FAILURE
30
4901
Communication loss with SIOB board, circuit A
Automatic, if communication
is re-established
Unit shuts down
Bus installation fault or
defective board
31
4902
Communication loss with SIOB board, circuit B
As above
Unit shuts down
As above
32
4501
Communication loss with Auxiliary Board Number 1
As above
None
As above
33
4502
Communication loss with Auxiliary Board Number 2
As above
None
As above
34
4503
Communication loss with Auxiliary Board Number 3
As above
None
As above
36
4603
Communication loss with Energy Management NRCP2 board As above
None
As above
37
4701
Communication loss with VLT Board Number 1
As above
Circuit A shuts down
As above
38
4702
Communication loss with VLT Board Number 2
As above
Circuit B shuts down
As above
39
4704
Communication loss with Fan A1 Drive board
As above
Circuit A shuts down
As above
40
4705
Communication loss with Fan A2 Drive board
As above
Circuit A shuts down
As above
41
4706
Communication loss with Fan A3 Drive board
As above
Circuit A shuts down
As above
42
4707
Communication loss with Fan B1 Drive board
As above
Circuit B shuts down
As above
43
4708
Communication loss with Fan B2 Drive board
As above
Circuit B shuts down
As above
44
4709
Communication loss with Fan B3 Drive board
As above
Circuit B shuts down
As above
PROCESS FAILURE
45
10001
Evaporator freeze protection
Automatic (the first alarm in
the last 24 hours) or Manual
Unit shuts down, but the pump
continues to run
No water flow,
defective thermistor
46
10005
Low suction temperature, circuit A
As above
Circuit A shuts down
Pressure sensor
defective, EXV blocked
or lack of refrigerant
47
10006
Low suction temperature, circuit B
As above
Circuit B shuts down
As above
52
10014
Customer safety loop failure
Automatic (the first alarm in
the last 24 hours) or Manual Unit shuts down
Customer interlock
input set on
78
10090
Flow controller configuration fault
Manual
Unit shuts down
Defective flow
controller or wiring error
79
10091
Flow controller fault
Automatic (the first alarm in
the last 24 hours) or Manual
Compressors and the
evaporator pump are stopped
As above
53
10030
Master/slave communication failure
As above
Unit shuts down
As above
7.6 - Alarm codes
The alarm codes are displayed in the
Reset Alarms
menu,
while the
Current Alarms
menu and
Alarm History /
Major Alarm History
include the description of the alarm.