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9.5 - Alarms description
This section includes all alarms/alerts associated with the
operation of the unit as well as optional drives used to provide
variable speed fans and variable speed pumps functionalities.
General alarm codes
The following table includes a list of alarms that might appear
on the unit. Please note that the alarm number given in the
first column can be useful when retrieving information
regarding the existing alarms.
Code Description
Possible cause
Action taken
Reset type
Thermistor failure
15001 Water Exchanger Entering Fluid Thermistor Failure Defective thermistor
Unit shuts down
Automatic, if thermistor
reading returns to normal
15002 Water Exchanger Leaving Fluid Thermistor Failure As above
As above
As above
15006 Condenser Entering Fluid Thermistor Failure As above
As above
As above
15007 Condenser Leaving Fluid Thermistor Failure As above
As above
As above
15010 OAT Thermistor Failure
As above
As above
As above
15011 Master/Slave Common Fluid Thermistor Failure As above
As above
As above
15012 Circuit A Suction Gas Thermistor Failure As above
As above
As above
15013 Circuit B Suction Gas Thermistor Failure As above
As above
As above
15032 Master/Slave Common Heating Fluid Thermistor
Failure
As above
As above
As above
15036 Dry Cooler LWT Thermistor Failure As above
As above
As above
15044 Circuit A Discharge Gas Thermistor Failure As above
As above
As above
15045 Circuit B Discharge Gas Thermistor Failure As above
As above
As above
Transducer failure
12001 Circuit A Discharge Pressure Transducer Failure Defective transducer
Circuit A shuts down
Automatic, if sensor voltage
reading returns to normal
12002 Circuit B Discharge Pressure Transducer Failure As above
Circuit B shuts down
As above
12004 Circuit A Suction Pressure Transducer Failure As above
Circuit A shuts down
Automatic (up to 3 alarms
within 24h); otherwise, Manual
12005 Circuit B Suction Pressure Transducer Failure As above
Circuit B shuts down
As above
12024 Water Exchanger Entering Fluid Transducer Failure As above
Unit shuts down
Automatic, if sensor voltage
reading returns to normal
12025 Water Exchanger Leaving Fluid Transducer Failure As above
As above
As above
12026 Water Condenser Entering Fluid Transducer Failure As above
As above
As above
12027 Water Condenser Leaving Fluid Transducer Failure As above
As above
As above
Communication failure
4901
Loss of communication with SIOB Board Number 1 Bus installation fault,
communication error
Unit shuts down
Automatic, if communication is
re-established
4902
Loss of communication with SIOB Board Number 2 As above
As above
As above
4601
Loss of communication with AUX1 Heating Device
Control board
As above
As above
As above
4602
Loss of communication with AUX1 Condenser
board
As above
As above
As above
4604
Loss of communication with AUX1 Options board
As above
Depends on the option
(Master-Slave disabled /
desuperheater disabled /
unit shuts down)
As above
4605
Loss of communication with Free Cooling Board 1
(free cooling dry cooler)
As above
Unit returns to mechanical
cooling
As above
Process failure
10001 Cooler Water Exchanger Freeze Protection
No water flow, defective
thermistor
Unit shuts down but the
pump continues to run
Automatic (the first alarm in the
last 24h); otherwise, Manual
10005 Circuit A Low Saturated Suction Temperature Pressure transducer
defective, EXV blocked
or lack of refrigerant
Circuit A shuts down
As above
10006 Circuit B Low Saturated Suction Temperature As above
Circuit B shuts down
As above