Alarm Codes; Alarm Code Descriptions - Carrier AQUASNAP 30RB Series Controls And Troubleshooting

6.4 - ALARM CODES

The following list gives a complete description of each alarm code and its possible cause.

ALARM CODE DESCRIPTIONS

ALARM CODE ALARM DESCRIPTION
Thermistor faults
th-01 Sensor fault, fluid entering water heat exchanger
th-02 Sensor fault, fluid leaving water heat exchanger
th-03 Defrost fault, circuit A
th-04 Defrost fault, circuit B
th-08 Heat reclaim condenser inlet sensor fault
th-09 Heat reclaim consenser outlet sensor fault
th-10 Outside temperature sensor fault
th-11 CHWS fluid sensor fault (master/slave)
th-12 Suction sensor fault, circuit A
th-13 Suction sensor fault, circuit B
th-14 Suction sensor fault, circuit C
th-18 Condenser subcooling liquid sensor fault, circuit A
th-19 Condenser subcooling liquid sensor fault, circuit B
th-21 Room temperature sensor fault
Pressure transducers
Pr-01 Discharge pressure transducer fault, circuit A
Pr-02 Discharge pressure transducer fault, circuit B
Pr-03 Discharge pressure transducer fault, circuit C
Pr-04 Suction pressure transducer fault, circuit A
Pr-05 Suction pressure transducer fault, circuit B
Pr-06 Suction pressure transducer fault, circuit C
Pr-07 Heat reclaim pressure sensor, circuit A
Pr-08 Heat reclaim pressure sensor, circuit B
Communication with slave
boards
Co-a1 Communication loss with compressor A1 board
Co-a2 Communication loss with compressor A2 board
Co-a3 Communication loss with compressor A3 board
Co-a4 Communication loss with compressor A4 board
Co-b1 Communication loss with compressor B1 board
Co-b2 Communication loss with compressor B2 board
Co-b3 Communication loss with compressor B3 board
Co-b4 Communication loss with compressor B4 board
Co-c1 Communication loss with compressor C1 board
Co-c2 Communication loss with compressor C2 board
Co-c3 Communication loss with compressor C3 board
Co-c4 Communication loss with compressor C4 board
Co-e1 Communication loss with EXV No. 1 board
Co-e2 Communication loss with EXV No. 2 board
Co-f1 Communication loss with fan No. 1 board
Co-f2 Communication loss with fan No. 2 board
Co-f3 Communication loss with fan No. 3 board
Co-01 Communication loss with free cooling board
Co-02 Communication loss with electric heater board
Co-03 Communication loss with energy management board
NRCP2
Co-04 Communication loss with heat recovery board NRCP2
Process faults
P-01 Water heat exchanger frost protection
P-05 Low suction temperature, circuit A
P-06 Low suction temperature, circuit B
P-07 Low suction temperature, circuit C
P-08 High superheat, circuit A
P-09 High superheat, circuit B
P-10 High superheat, circuit C
P-11 Low superheat, circuit A
P-12 Low superheat, circuit B
P-13 Low superheat, circuit C
RESET TYPE
Automatic when the temperature measured by
the sensor returns to normal
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Automatic when the voltage transmitted by the
sensor returns to normal
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Automatic when communication is re-established
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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.
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PROBABLE CAUSE
Defective thermistor
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Defective transducer or installation fault
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Installation bus fault or defective slave board
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Water flow rate to low or defective thermistor
Pressure sensor defective, EXV blocked or low
refrigerant charge
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EXV or thermistor or transducer defective
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