Riello NXC 021 - Unit Maintenance Checks; Refrigerant Volume Check

97
Alarm codes
EN
6.1 ALARM MENU
The Pro-Dialog+  panel features many troubleshooting
functions. In case of error, an alarm will be triggered and
its identicationcodewill beloggedintothealarm menu,
CUR_ALRMandALARMRSTsub-menus.
ThecontrolpanelLEDswillsignalthealarms.Itisreminded
that:
• ashing LED indicates that at least one circuit of the
machine
isinoperationbutthereisawarningsituation.
• steadyLEDindicatesthatatleastonecircuitofthemachi-
ne
hasstoppedduetoanerror.
ALARMRST sub-menu shows up to ve alarm codes active
withintheunit.
6.3 ALARM CODES
Alarm
number
Alarm code Alarm description Reset mode Probable cause Control system reaction
Thermistor faults
1 th-01 Heatexchangerenteringwatertemperature
sensor fault
Automatic,whenthe
temperaturedetectedisback
to normal again
Thermistor fault Unit stop
2 th-02 Heatexchangerleavingwatertemperature
sensor fault
As above As above As above
3 th-03 Defrost fault of cooling circuit A As above As above Stopofthecircuitifthedeviceis
inheatingmode
4 th-04 DefrostfaultofcircuitBorsecondfaultof
circuit B sensor
As above As above As above
5 th-10 Outdoortemperaturesensorfault As above As above Unit stop
6 th-11 CHWS sensor fault
(Master/Slave)
As above As above Stop of the Master/Slave operation
mode
7 th-12 Circuit A suction sensor fault As above As above Stop of the circuit
8 th-13 Circuit B suction sensor fault As above As above As above
9 th-44 Faultofsuctionsensor,heatexchanger1 As above As above As above
10 th-45 Faultofsuctionsensor,heatexchanger2 As above As above As above
Pressure transducer faults
11 Pr-01 DeliverypressuretransducerAfault Automatic,whenvoltageis
backtonormal
Transducerfaultor
installation error
Stop of the circuit
12 Pr-02 DeliverypressuretransducerBfault As above As above As above
13 Pr-04 CircuitAsuctionpressuretransducerfault As above As above As above
14 Pr-05 CircuitBsuctionpressuretransducerfault As above As above As above
51 Pr-24 Pressuresensorfaultatwaterinlet Automatic,whenthevalueof
thevoltagetransmittedbythe
sensorisbacktonormal
Sensor fault or
installation error
Stop of the circuit
52 Pr-25 Pressuresensorfaultatwateroutlet As above As above As above
Communication with slave boards
15 CO-BB CommunicationlosswithNRCP2board Automatic,when
communications have been
restored
Communication bus
installation error or
slaveboardfault
Compressor A3 or circuit B stop,
accordingtoconguration
16 Co-ht Communicationlosswiththeboardfor
additionalheatingsteps
As above As above Stopofadditionalheatingsteps
17 Co-e1 CommunicationlosswithEXVvalveboard As above As above Unit stop
18 Co-o1 CommunicationlosswithPD-AUX1board As above As above Device stop if equipped with
optionalwaterpressuresensor
6.2 ALARM RESET
Once the error is solved, the alarm code
must be reset. Reset procedure can
bemanualorautomatic,dependingonthetypeofcodeof
alarm. Alarm reset can be carried out al-
so
 with machine running. In case of power blackout
the
unitwillautomaticallyrestartwithouttheenablingre-
questfromthecontrolpanel.
Nevertheless,ifthemachine,duringthisinterruption,regi-
sters
somealarms,theycaninhibittheautomaticrestart.
The manual resetprocedure of the alarms must be carried
outfromtheALARMRSTmenu,RST_ALMparameter.However,
accesstothisparametercanbeprotectedbyapassword(that
canbeconguredfromtheGENCONFmenu).