Carrier AQUASnap 30RB, Controls And Troubleshooting

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6.4 - ALARM CODES
The following list gives a complete description of each alarm code and its possible cause.
ALARM CODE DESCRIPTIONS
ALARM CODE
Thermistor faults
th-01
th-02
th-03
th-04
th-08
th-09
th-10
th-11
th-12
th-13
th-14
th-18
th-19
th-21
Pressure transducers
Pr-01
Pr-02
Pr-03
Pr-04
Pr-05
Pr-06
Pr-07
Pr-08
Communication with slave
boards
Co-a1
Co-a2
Co-a3
Co-a4
Co-b1
Co-b2
Co-b3
Co-b4
Co-c1
Co-c2
Co-c3
Co-c4
Co-e1
Co-e2
Co-f1
Co-f2
Co-f3
Co-01
Co-02
Co-03
Co-04
Process faults
P-01
P-05
P-06
P-07
P-08
P-09
P-10
P-11
P-12
P-13
ALARM DESCRIPTION
Sensor fault, fluid entering water heat exchanger
Sensor fault, fluid leaving water heat exchanger
Defrost fault, circuit A
Defrost fault, circuit B
Heat reclaim condenser inlet sensor fault
Heat reclaim consenser outlet sensor fault
Outside temperature sensor fault
CHWS fluid sensor fault (master/slave)
Suction sensor fault, circuit A
Suction sensor fault, circuit B
Suction sensor fault, circuit C
Condenser subcooling liquid sensor fault, circuit A
Condenser subcooling liquid sensor fault, circuit B
Room temperature sensor fault
Discharge pressure transducer fault, circuit A
Discharge pressure transducer fault, circuit B
Discharge pressure transducer fault, circuit C
Suction pressure transducer fault, circuit A
Suction pressure transducer fault, circuit B
Suction pressure transducer fault, circuit C
Heat reclaim pressure sensor, circuit A
Heat reclaim pressure sensor, circuit B
Communication loss with compressor A1 board
Communication loss with compressor A2 board
Communication loss with compressor A3 board
Communication loss with compressor A4 board
Communication loss with compressor B1 board
Communication loss with compressor B2 board
Communication loss with compressor B3 board
Communication loss with compressor B4 board
Communication loss with compressor C1 board
Communication loss with compressor C2 board
Communication loss with compressor C3 board
Communication loss with compressor C4 board
Communication loss with EXV No. 1 board
Communication loss with EXV No. 2 board
Communication loss with fan No. 1 board
Communication loss with fan No. 2 board
Communication loss with fan No. 3 board
Communication loss with free cooling board
Communication loss with electric heater board
Communication loss with energy management board
NRCP2
Communication loss with heat recovery board NRCP2
Water heat exchanger frost protection
Low suction temperature, circuit A
Low suction temperature, circuit B
Low suction temperature, circuit C
High superheat, circuit A
High superheat, circuit B
High superheat, circuit C
Low superheat, circuit A
Low superheat, circuit B
Low superheat, circuit C
RESET TYPE
Automatic when the temperature measured by
the sensor returns to normal
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
Automatic when the voltage transmitted by the
sensor returns to normal
As above
As above
As above
As above
As above
As above
As above
Automatic when communication is re-established
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
Automatic if the same alarm has not tripped
during the last 24 hours, otherwise manual.
Automatic when the temperature returns to
normal, and if this alarm has not appeared during
the last 24 hours, otherwise manual.
As above
As above
As above
As above
As above
As above
As above
As above
PROBABLE CAUSE
Defective thermistor
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
Defective transducer or installation fault
As above
As above
As above
As above
As above
As above
As above
Installation bus fault or defective slave board
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
As above
Water flow rate to low or defective thermistor
Pressure sensor defective, EXV blocked or low
refrigerant charge
As above
As above
As above
As above
As above
EXV or thermistor or transducer defective
As above
As above