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7.6.1 - General/major alarms
code
Alarm
code
Alarm description Reset type Action taken
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
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
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
45 10001 Evaporator freeze protection
Automatic (the rst alarm in
the last 24 hours) or Manual
Unit shuts down, but the pump
continues to run
No water ow,
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 rst alarm in
the last 24 hours) or Manual
Unit shuts down
Customer interlock
input set on
78 10090 Flow controller conguration fault Manual Unit shuts down
Defective ow
controller or wiring error
79 10091 Flow controller fault
Automatic (the rst 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.
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