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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 ow, defective
thermistor
Unit shuts down but the
pump continues to run
Automatic (the rst 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
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