9.6 - Alarms description
The following table includes all alarms/alerts associated with the
operation of the unit.
9 - DIAGNOSTICS
Code Description Possible cause Action taken Reset type
Thermistor failure
15001 Cooler Entering Fluid Thermistor Defective thermistor Unit shuts down Automatic, if thermistor
reading returns to normal
15002 Cooler Leaving Fluid Thermistor As above Unit shuts down As above
15006 Condenser Entering Fluid Thermistor As above Unit shuts down As above
15007 Condenser Leaving Fluid Thermistor As above Unit shuts down As above
15011 MASTER/Slave Common Fluid Thermistor As above Master/Slave assembly
control disabled. Unit returns
to the standalone mode
As above
15032 MASTER/Slave Common Heat Fluid
Thermistor
As above As above As above
15018 Circuit A Condenser Subcooling Liquid
Thermistor Failure
As above Circuit A shuts down As above
15019 Circuit B Condenser Subcooling Liquid
Thermistor Failure
As above Circuit B shuts down As above
15021 Space Temperature Thermistor Defective thermistor while reset
by “Space temp.” is activated
No action (warning only) As above
15010 OAT Thermistor Failure Defective thermistor No action (warning only) As above
15046 Free Cooling Water Loop Thermistor Failure As above Free cooling is disabled, but
the unit continues to operate
As above
15047 Free Cooling Leaving Water Thermistor
Failure
As above As above As above
15048 Free Cooling OAT Sensor Failure As above As above As above
15036 External Air Cond. Control: Leaving Water
Thermistor Failure
As above Unit shuts down As above
15099 External Air Cond. Control: Outdoor Air
Thermistor Failure
As above Unit shuts down As above
Pressure transducer failure
12001 Circuit A Discharge Transducer Failure Defective transducer or
installation fault
Circuit A shuts down Automatic, if sensor voltage
reading returns to normal
12002 Circuit B Discharge Transducer Failure As above Circuit B shuts down As above
12004 Circuit A Suction Transducer Failure As above Circuit A shuts down As above
12005 Circuit B Suction Transducer Failure As above Circuit B shuts down As above
12031 Circuit A Condenser Subcooling is negative Defective transducer or
installation fault, calculated
condenser subcooling is
negative
No action (warning only) As above
12032 Circuit B Condenser Subcooling is negative As above No action (warning only) As above
Communication failure
4901 Loss of communication with SIOB Board
Number 1
Bus installation fault or
defective board
Unit shuts down Automatic, if communication
is re-established
4902 Loss of communication with SIOB Board
Number 2
As above Circuit B shuts down As above
4903 Loss of communication with SIOB Board
Number 3
As above Unit shuts down As above
4601 Loss of communication with AUX1 Board
Number 1
As above Unit continues to operate, but
options related to the board
are disabled, e.g. leak
detection, master/slave
assembly control
As above
4602 Loss of communication with AUX1
FreeCooling board
As above Free cooling is disabled As above
4611 Loss of communication with AUX1 Air
Condensing Control board
As above Unit shuts down As above
Unit protections
10001 Cooler Freeze Protection No water ow, defective
thermistor
Unit shuts down Automatic, if water exchanger
LWT is 3 K above the
setpoint, (the rst alarm within
24 hours); otherwise, Manual
10002 Circuit A Condenser Freeze Protection Discharge pressure transducer
defective, refrigerant leak or
low condenser water
temperature
Unit is "On": Circuit A
shuts down, but the
condenser pump is turned on
Unit is “Off”: Condenser
pump is turned on, but the
unit cannot be started
Automatic, if saturated
discharge temperature is
more than 4.4°C; otherwise,
Manual
10003 Circuit B Condenser Freeze Protection As above Unit is "On": Circuit B shuts
down, but the condenser
pump is turned on
Unit is “Off”: Condenser
pump is turned on, but the
unit cannot be started
As above
31
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