6 - DIAGNOSTICS - TROUBLESHOOTING
6.4 - Alarm codes
Alarm
No.
Alarm
code
Alarm description Reset type Probable cause Action taken by the
control
Thermistor faults
1 th-01 Sensor fault, fluid entering water
heat exchanger
Automatic when the temperature
measured by the sensor returns to
normal
Defective thermistor Unit is shut down
2 th-02 Sensor fault, fluid leaving water heat
exchanger
As above As above As above
3 th-03 Defrost fault, circuit A As above As above Circuit is shut down, if the unit
is in heating mode
4 th-04 Defrost fault, circuit B or second
default sensor fault, circuit B
As above As above As above
5 th-10 Outside temperature sensor fault As above As above Unit is shut down
6 th-11 CHWS fluid sensor fault
(master/slave)
As above As above The master/slave
mode is
stopped
7 th-12 Suction sensor fault, circuit A As above As above Circuit is shut down
8 th-13 Suction sensor fault, circuit B As above As above As above
9 th-44 Suction sensor fault, coil 1 As above As above As above
10 th-45 Suction sensor fault, coil 2 As above As above As above
Pressure transducer faults
11 Pr-01 Discharge pressure transducer fault,
circuit A
Automatic when the voltage
transmitted by the sensor returns to
normal
Defective transducer or installation
fault
Circuit is shut down
12 Pr-02 Discharge pressure transducer fault,
circuit B
As above As above As above
13 Pr-04 Suction pressure transducer fault,
circuit A
As above As above As above
14 Pr-05 Suction pressure transducer fault,
circuit B
As above As above As above
51 Pr-24 Entering water pressure sensor fault Automatic when the voltage
transmitted by the sensor returns to
normal
Defective transducer or installation
fault
Circuit is shut down
52 Pr-25 Leaving water pressure sensor fault As above As above As above
Communication with the slave boards
15 CO-BB Communication loss with the NRCP2
board
Automatic when communication is
re-established
Installation bus fault or defective
slave board
Depending on the configuration,
compressor A3 is shut down or
circuit B is shut down.
16 Co-ht Communication loss with the
additonal heating stage board
As above As above The additional heating stages
are shut down
17 Co-e1 Communication loss with the EXV
board
As above As above Unit is shut down
18 Co-o1 Communication loss with the
PD-AUX 1 board
As above As above Unit with optional water
pressure sensors, unit is shut
down
19 Co-o2 Communication loss with the
PD-AUX 2 board
As above As above None
Process faults
20 P-01 Water heat exchanger frost
protection
Automatic if the same alarm has
not tripped during the last 24 hours,
otherwise manual.
Water flow rate too low or defective
thermistor
Unit is shut down
21 P-05 Low suction temperature, circuit A Automatic when the temperature
returns to normal, and if this alarm
has not appeared during the last 24
hours, otherwise manual.
Pressure sensor defective, EXV
blocked or low refrigerant charge
Circuit is shut down
22 P-06 Low suction temperature, circuit B As above As above As above
23 P-08 High superheat, circuit A As above As above As above
24 P-09 High superheat, circuit B As above As above As above
25 P-11 Low superheat, circuit A As above As above As above
26 P-12 Low superheat, circuit B As above As above As above
27 P-14 Water flow control and customer
interlock fault
Automatic if the unit is in manual
shut-down status, otherwise manual.
Heat exchanger pump defect or
water flow switch fault
Unit is shut down
28 P-16 Compressor A1 not started or no
pressure increase registered
Manual Connection problem Compressor is shut down
29 P-17 Compressor A2 not started or no
pressure increase registered
As above As above As above
30 P-18 Compressor A3 not started or no
pressure increase registered
As above As above As above
31 P-20 Compressor B1 not started or no
pressure increase registered
As above As above As above
32 P-21 Compressor B2 not started or no
pressure increase registered
As above As above As above
EN - 23 EREBA ACCESS
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