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Table 49 — Alarm Codes
LEGEND
PREFIX
CODE
SUFFIX
CODE
ALARM
NUMBER
ALARM DESCRIPTION REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
th 01 1 Cooler Entering Fluid
Thermistor
Temperature measured
by the controller is
outside of the range
of –40 F to 245 F
Unit be shut down or
not allowed to start
Automatic Faulty Sensor,
wiring error or failed
main base board
02 2 Cooler Leaving Fluid
Thermistor
03 3 Circuit A Defrost Thermistor None
Automatic
Configuration error
04 4 Circuit B Defrost Thermistor
06 5 Condenser Entering
Fluid Thermistor
07 6 Condenser Leaving
Fluid Thermistor
08 7 Reclaim Condenser
Entering Thermistor
09 8 Reclaim Condenser
Leaving Thermistor
11 10 Master/Slave Common Fluid
Thermistor
Dual chiller deacti-
vated. Master and
slave machines
operate in stand-
alone mode
Automatic
Faulty Sensor,
wiring error or failed
main base board
12 11 Circuit A Suction Gas
Thermistor
Circuit shut down or
not allowed to start
Automatic
Faulty Sensor,
wiring error, failed
EXV or CPM board
13 12 Circuit B Suction Gas
Thermistor
15 14 Circuit A Discharge Gas
Thermistor
16 15 Circuit B Discharge Gas
Thermistor
18 17 Circuit A Condenser Sub-
cooling Liquid Thermistor
Not supported
Automatic
Configuration error
19 18 Circuit B Condenser Sub-
cooling Liquid Thermistor
21 19 Space Temperature
Thermistor
Alarm tripped
Automatic
Faulty Sensor, wiring
error, failed EMM
board
23 20 Cooler heater feedback
thermistor
None
Automatic
Configuration error
24 21 Circuit A Economizer Gas
Thermistor
Circuit economizer
function disabled
Automatic
Faulty Sensor,
wiring error, failed
EXV board
25 22 Circuit B Economizer Gas
Thermistor
Pr 01 26 Circuit A Discharge
Transducer
Measured voltage is
0 vdc or SST > EWT and
EXV < 50% for 1 minute
Circuit shut down or
not allowed to start
Automatic Faulty transducer,
wiring error, failed
main base board or
fan board
02 27 Circuit B Discharge
Transducer
04 29 Circuit A Suction Transducer
05 30 Circuit B Suction Transducer
07 32 Circuit A Reclaim Pump-
down Pressure Transducer
None
Automatic
Configuration error
08 33 Circuit B Reclaim Pump-
down Pressure Transducer
10 34 Circuit A Oil Pressure
Transducer
Circuit shut down or
not allowed to start
Automatic
Faulty transducer,
wiring error, failed
CPM board
11 35 Circuit B Oil Pressure
Transducer
13 37 Circuit A Economizer
Pressure Transducer
Measured voltage is
0 vdc
14 38 Circuit B Economizer
Pressure Transducer
CCN — Carrier Comfort Network
®
MLV — Minimum Load Valve
CPM — Compressor Protection Module MOP — Maximum Operating Pressure
EMM — Energy Management Module MTA — Must Trip Amps
EWT — Entering Water Temperature SST — Saturated Suction Temperature
EXV — Electronic Expansion Valve UL — Underwriters Laboratories
HPS — High Pressure Switch