23
Reglermanual - VMGFF102
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, fl uid 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, fl uid 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 fl uid 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 confi guration,
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 fl ow 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 fl ow control and customer
interlock fault
Automatic if the unit is in manual
shut-down status, otherwise manual.
Heat exchanger pump defect or
water fl ow 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
Summary of Contents for AR05
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