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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 flow, defective
thermistor
Unit shuts down
Automatic, if water exchanger
LWT is 3 K above the
setpoint, (the first 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