Alarm codes
98
EN
Alarm
number
Alarm code Alarm description
Reset mode
Probable cause
Control system reaction
Thermistor faults
19
Co-o2
Communication loss with PD-AUX 2 board
As above
As above
None
Process faults
20
P-01
Anti-freeze protection of the water-
refrigerant exchanger has been triggered
Automatic if the alarm has not
been triggered in the previous
24 hours, otherwise manual
Water flow rate too low
or thermistor fault
Unit stop
21
P-05
Low suction pressure of circuit A
Automatic when the detected
pressure is back to normal
and the alarm has not been
triggered in the previous 24
hours, otherwise manual
EXV valve lockout,
sensor fault or low
refrigerant charge
Stop of the circuit
22
P-06
Low suction pressure of circuit B
As above
As above
As above
23
P-08
High overheating of circuit A
As above
As above
As above
24
P-09
High overheating of circuit B
As above
As above
As above
25
P-11
Low overheating of circuit A
As above
As above
As above
26
P-12
Low overheating of circuit B
As above
As above
As above
27
P-14
Flow rate control interlock fault or external
safety device fault
Automatic if the unit is in
manual stop, manual in all
other cases
Refrigerant / water
exchanger pump fault
or no flow
Unit stop
28
P-16
Compressor A1 not starting or pressure
increase failure
Manual
Connection problems
Compressor stop
29
P-17
Compressor A2 not starting or pressure
increase failure
As above
As above
As above
30
P-18
Compressor A3 not starting or pressure
increase failure
As above
As above
As above
31
P-20
Compressor B1 not starting or pressure
increase failure
As above
As above
As above
32
P-21
Compressor B2 not starting or pressure
increase failure
As above
As above
As above
33
P-29
System Manager communication loss
Automatic or reset by the
communications
Bus installation error of
CCN network
The device switches to stand-
alone operating mode
34
P-30
Communication loss between Master and
Slave
Automatic or reset by the
communications
Bus installation error of
CCN network
As above
35
MC-nn
Configuration error of Master chiller No. 1
Automatic upon restoring
correct configuration or
upon stopping Master / Slave
operation mode
Master/Slave operation
configuration error
Stop of the Master/Slave operating
mode
36
FC-n0
No factory configuration
Automatic upon entering
factory configuration
Unit size has not been
configured
Unit stop
37
FC-01
Illegal factory configuration number
Manual
Unit size has not been
correctly configured
As above
38
P-31
Emergency stop from CCN network
Manual
Command from CCN
network
As above
39
P-32
Fault of pump No. 1 for water circulation
Manual
Pump motor
overheating or pump
connection missing
Stop of device operation with no
emergency pump
40
P-33
Fault of pump No. 2 for water circulation
Manual
As above
As above
41
P-37
Repeated capacity controls of circuit A for
high delivery pressure
Automatic
Transducer fault or
cooling circuit problems
None
42
P-38
Repeated capacity controls of circuit B for
high delivery pressure
Automatic
As above
As above
43
P-40
Repeated capacity controls of circuit A for low
suction pressure
Manual
Transducer fault or
refrigerant charge
missing
Circuit operation stop
44
P-41
Repeated capacity controls of circuit B for
low suction pressure
Manual
As above
As above
45
P-43
Heat exchanger temperature too low (less
than 10°C) preventing start-up
Automatic after detected
temperature is back to normal
or when the unit works in
cooling mode again
Protection of out-of-
range compressor and
temperature sensor
fault
The device could not be started
46
P-97
Inversion of entering/leaving water
temperature sensors
Manual
Faulty sensor. Sensor
inversion
Unit stop
48
V0-xx
Fault of variable flow rate regulator of circuit
A
Manual or automatic
Fault or warning for
speed regulator
Warning: the circuit carries on
working but the regulator slows
down the motor
alarm: the circuit stops
