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The following list gives a complete description of each alarm code and its possible cause.
th-01 Sensor fault, uid entering water heat exchanger Automatic when the
temperature measured by
the sensor returns to normal
Defective thermistor Unit is shut down
th-02 Sensor fault, uid leaving water heat exchanger As above As above As above
th-03 Defrost fault, circuit A As above As above Circuit is shut down, if the unit is in heating
mode
th-04 Defrost fault, circuit B As above As above As above
th-08 Heat reclaim condenser inlet sensor fault As above As above The heat reclaim mode is stopped
th-09 Heat reclaim consenser outlet sensor fault As above As above As above
th-10 Outside temperature sensor fault As above As above Unit is shut down
th-11 CHWS uid sensor fault (master/slave) As above As above The master/slave mode is stopped
th-12 Suction sensor fault, circuit A As above As above Circuit is shut down
th-13 Suction sensor fault, circuit B As above As above As above
th-14 Suction sensor fault, circuit C As above As above As above
th-18 Condenser subcooling liquid sensor fault, circuit A As above As above The heat reclaim mode of the circuit is stopped
th-19 Condenser subcooling liquid sensor fault, circuit B As above As above As above
th-21 Room temperature sensor fault As above As above Set-point control by the thermostat is stopped
Pr-01 Discharge pressure transducer fault, circuit A Automatic when the voltage
transmitted by the sensor
returns to normal
Defective transducer
or installation fault
Circuit is shut down
Pr-02 Discharge pressure transducer fault, circuit B As above As above As above
Pr-03 Discharge pressure transducer fault, circuit C As above As above As above
Pr-04 Suction pressure transducer fault, circuit A As above As above As above
Pr-05 Suction pressure transducer fault, circuit B As above As above As above
Pr-06 Suction pressure transducer fault, circuit C As above As above As above
Pr-07 Heat reclaim pressure sensor, circuit A As above As above The heat reclaim mode is stopped
Pr-08 Heat reclaim pressure sensor, circuit B As above As above As above
Pr-16 Suction pressure sensor, free cooling refrigerant
pump, circuit A
As above As above The free cooling mode is stopped
Pr-17 Discharge pressure sensor, free cooling refrigerant
pump, circuit A
As above As above As above
Pr-18 Suction pressure sensor, free cooling refrigerant
pump, circuit B
As above As above As above
Pr-19 Discharge pressure sensor, free cooling refrigerant
pump, circuit B
As above As above As above
Pr-20 Suction pressure sensor, free cooling refrigerant
pump, circuit C
As above As above As above
Pr-21 Discharge pressure sensor, free cooling refrigerant
pump, circuit C
As above As above As above
Co-a1 Communication loss with compressor A1 board Automatic when
communication is re-
established
Installation bus fault or
defective slave board
Compressor is shut down
Co-a2 Communication loss with compressor A2 board As above As above As above
Co-a3 Communication loss with compressor A3 board As above As above As above
Co-a4 Communication loss with compressor A4 board As above As above As above
Co-b1 Communication loss with compressor B1 board As above As above As above
Co-b2 Communication loss with compressor B2 board As above As above As above
Co-b3 Communication loss with compressor B3 board As above As above As above
Co-b4 Communication loss with compressor B4 board As above As above As above
Co-c1 Communication loss with compressor C1 board As above As above As above
Co-c2 Communication loss with compressor C2 board As above As above As above
Co-c3 Communication loss with compressor C3 board As above As above As above
Co-c4 Communication loss with compressor C4 board As above As above As above
Co-e1 Communication loss with EXV No. 1 board As above As above Circuits A and B are shut down
Co-e2 Communication loss with EXV No. 2 board As above As above Circuit C is shut down
Co-f1 Communication loss with fan No. 1 board As above As above Circuit A is shut down (on certain units also
circuit B)
Co-f2 Communication loss with fan No. 2 board As above As above Circuit B is shut down
Co-f3 Communication loss with fan No. 3 board As above As above Circuit C is shut down
Co-02 Communication loss with electric heater board As above As above Electric heater control is stopped
Co-03 Communication loss with energy management
board NRCP2
As above As above The EMM accessory functions are stopped
Co-04 Communication loss with heat recovery board
NRCP2
As above As above Unit is shut down
Co-05 Communication loss with the AUX1 free-cooling
board of circuit A
Automatic, when the
communication is re-
established
Bus installation fault
or slave board faulty
Circuit A is shut down
Co-06 Communication loss with the AUX1 free-cooling
board of circuit B
As above As above Circuit B is shut down
Co-07 Communication loss with the AUX1 free-cooling
board of circuit C
As above As above Circuit C is shut down
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