31
No. Code Alarm description Reset type Action taken Possible cause
12 15018 Circuit A Condenser Subcooling Liquid
Thermistor
Automatic, if thermistor
reading returns to normal
Circuit A shuts down Defective thermistor
13 15019 Circuit B Condenser Subcooling Liquid
Thermistor
As above Circuit B shuts down As above
14 15021 Space Temperature Thermistor As above Alert As above
15 15024 Circuit A Economizer Gas Thermistor As above Economizer function
disabled
As above
16 15025 Circuit B Economizer Gas Thermistor As above As above As above
17 15026 Circuit C Economizer Gas Thermistor Not applicable to this unit
Transducer failures
18 12001 Circuit A Discharge Transducer Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down Defective transducer
19 12002 Circuit B Discharge Transducer As above Circuit B shuts down As above
20 12003 Circuit C Discharge Transducer Not applicable to this unit
21 12004 Circuit A Suction Transducer Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down Defective transducer
22 12005 Circuit B Suction Transducer As above Circuit B shuts down As above
23 12006 Circuit C Suction Transducer Not applicable to this unit
24 12010 Circuit A Oil Pressure Transducer Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down Defective transducer
25 12011 Circuit B Oil Pressure Transducer As above Circuit B shuts down As above
26 12012 Circuit C Oil Pressure Transducer Not applicable to this unit
27 12013 Circuit A Economizer Pressure Transducer Automatic, if sensor voltage
reading returns to normal
Circuit A shuts down Defective transducer
28 12014 Circuit B Economizer Pressure Transducer As above Circuit B shuts down As above
29 12015 Circuit C Economizer Pressure Transducer Not applicable to this unit
Communication failures
30 4101 Loss of communication with Compressor
Board A
Automatic, if communication
is re-established
Unit shuts down Bus installation fault,
communication error
31 4201 Loss of communication with Compressor
Board B
As above Unit shuts down As above
32 4301 Loss of communication with Compressor
Board C
Not applicable to this unit
33 4901 Loss of communication with SIOB Board A Automatic, if communication
is re-established
Unit shuts down Bus installation fault,
communication error
34 4902 Loss of communication with SIOB Board B As above Unit shuts down As above
35 4903 Loss of communication with SIOB Board C Not applicable to this unit
36 4906 Loss of communication with SIOB Board
EMM
Automatic, if communication
is re-established
Unit shuts down Bus installation fault,
communication error
37 4907 Loss of communication with SIOB Board
DGT
As above Unit shuts down As above
38 4501 Loss of communication with Aux Board
Number 1 (leak detection option board)
As above Circuit A shuts down OR
circuit B shuts down
As above
Process failures and other
39 10001 Cooler Freeze Protection Manual Unit shuts down No water ow, defective
thermistor
40 10002 Circuit A Condenser Freeze Automatic (if saturated
discharge temperature is
above 4.4°C) or Manual
Circuit A shuts down, but
the pump is running
Discharge pressure
transducer defective,
refrigerant leak or low
condenser water
temperature
41 10003 Circuit B Condenser Freeze As above Circuit B shuts down, but
the pump is running
As above
42 10004 Circuit C Condenser Freeze Not applicable to this unit
43 10005 Circuit A Low Suction Temperature Automatic (the rst alarm
within 24 hours) or Manual
Circuit A shuts down Pressure sensor
defective, EXV blocked
or lack of refrigerant
44 10006 Circuit B Low Suction Temperature As above Circuit B shuts down As above
45 10007 Circuit C Low Suction Temperature Not applicable to this unit
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