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7.5 - Alarm codes
7.5.1 - General alarm codes
Alarm
No.
ALARMRST
code*
Description of the alarm text
Reset type
Action taken by the control
Probable cause
Thermistor faults
1
15001
Evaporator entering water thermistor fault
Automatic if the temperature
measured by the sensor
returns to normal
Unit shuts down
Defective thermistor
2
15002
Evaporator leaving water thermistor fault
As above
Unit shuts down
As above
3
15006
Condenser entering water thermistor fault
As above
Unit shuts down, if entering water control
in heating mode. Otherwise none.
As above
4
15007
Condenser leaving water thermistor fault
As above
Unit shuts down, if leaving water control
in heating mode. Otherwise none.
As above
5
15011
Common water master/slave thermistor fault
As above
Unit returns to stand-alone mode
As above
6
15032
Common hot water master/slave thermistor fault
As above
Unit returns to stand-alone mode
As above
7
15012
Suction gas temperature sensor fault, circuit A
As above
Circuit A shuts down
As above
8
15013
Suction gas temperature sensor fault, circuit B
As above
Circuit B shuts down
As above
9
15015
Discharge gas temperature sensor fault, circuit A As above
Circuit A shuts down
As above
10
15016
Discharge gas temperature sensor fault, circuit B As above
Circuit B shuts down
As above
11
15033
Compressor motor temperature sensor fault,
circuit A
As above
Circuit A shuts down
As above
12
15034
Compressor motor temperature sensor fault,
circuit B
As above
Circuit B shuts down
As above
13
15021
Space Temperature Thermistor
As above
None
As above
14
15036
Dry Cooler Leaving thermistor Failure
As above
None
As above
15
15010
Outdoor air Thermistor
As above
None
As above
Pressure transducers
16
12001
Discharge transducer fault, circuit A
Automatic, if the voltage
transmitted by the sensor
returns to normal
Circuit A shuts down
Transducer fault or
installation fault
17
12002
Discharge transducer fault, circuit B
As above
Circuit B shuts down
As above
18
12004
Suction transducer fault, circuit A
As above
Circuit A shuts down
As above
19
12005
Suction transducer fault, circuit B
As above
Circuit B shuts down
As above
20
12010
Oil pressure transducer, circuit A
As above
Circuit A shuts down
As above
21
12011
Oil pressure transducer, circuit B
As above
Circuit B shuts down
As above
Communication with slave boards
22
4401
Communication loss with EXV board 1
Automatic if the communi-
cation is re-established
Unit shuts down
Bus installation fault or
defective slave board
23
4501
Communication loss with auxiliary board 1
As above
Unit continues to operate, but the
functions linked to the board are
deactivated
As above
24
4502
Communication loss with auxiliary board 2
As above
Unit shuts down
As above
25
4503
Communication loss with auxiliary board 3
As above
Circuit B shuts down
As above
26
4504
Communication loss with auxiliary board 4
As above
Circuit B shuts down
As above
27
4601
Communication loss with the main NRCP2 board
As above
Unit shuts down
As above
28
4603
Communication loss with energy management
board
As above
Unit continues to operate, but the
functions linked to the board are
deactivated
As above
29
4701
Communication loss with variator, compressor A
As above
Circuit A shuts down
As above
30
4702
Communication loss with variator, compressor B
As above
Circuit B shuts down
As above
Process faults
31
10001
Evaporator frost protection
Automatic, if the same alarm
has not tripped during the
last 24 hours, otherwise
manual
Unit shuts down. Start-up of the
evaporator pump, if the unit has shut
down
Lack of water flow or
defective thermistor
32
10002
Condenser frost protection, circuit A
Automatic, if the saturated
discharge temperature is
above 4.4°C
Circuit shuts down. Start-up of the
condenser pump, if the unit has shut
down
Discharge pressure trans-
ducer defective, refrigerant
leak or low condenser
water temperature
33
10003
Condenser frost protection, circuit B
As above
As above
As above
34
10005
Low saturated suction temperature, circuit A
Automatic, if the temperature
returns to normal and if the
same alarm has not tripped
during the last 24 hours
Compressor capacity increase or
unloading stopped, depending on the
temperature value
Pressure sensor, EXV
blocked or lack of
refrigerant
35
10006
Low saturated suction temperature, circuit B
As above
As above
As above
40
10014
Customer safety loop fault
Automatic, if the same alarm
has not tripped during the
last 24 hours
Unit shuts down
-
41
10030
Master/slave communication fault
As above
-
As above
42
10067
Low oil pressure, circuit A
Manual
Circuit A shuts down
Pressure sensor or
wiring defective or oil
filter badly installed
43
10068
Low oil pressure, circuit B
Manual
Circuit B shuts down
As above
44
10070
Maximum oil filter pressure differential, circuit A
Manual
Circuit A shuts down
As above
45
10071
Maximum oil filter pressure differential, circuit B
Manual
Circuit B shuts down
As above
*
Alarm code in ALARMRST table
