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17 ALARMS SUMMARY TABLE
The units envision two types of malfunctioning signals:
— Pre-alarm
— Alarm
The first type is indicated by the flashing of the red LED on the display, successive pressing of the bell key
in the table below). A pre-alarm remains such for 60 seconds: if after this time the condition that caused the pre-alarm has not disappeared, the same becomes an alarm. The
alarms are displayed in the same way as the pre-alarms, except for the switch-on of the fixed red LED. Before rearming the unit, it is recommended to contact the after-sales
service. To rearm the unit, switch it off and back on again using the stand-by key.
ATTENTION, the pre-alarms can become alarms when:
— A time has passed longer than or equal to 60 seconds, in the pre-alarm condition.
— The maximum number of pre-alarms in one hour (five) has been exceeded. In this case, every successive pre-alarm will be displayed directly as an alarm, and as such, will
stop the machine until the reason for the same is solved.
Code
Alarm code
Pre-alarm
Compressor magnet circuit breaker
1
101
Thermomagnetic fan switch
Pump magnet circuit breaker
2
102
Thermomagnetic fan switch
3
103
4
104
Water differential pressure switch
5
105
6
106
7
107
8
108
9
109
10
110
High discharge gas temperature
11
111
Flow pressure transducer no compressor
12
112
13
113
14
114
Intake pressure transducer no compressor This signal occurs when the compressor intake transducer is absent and the machine is set as heat pump
15
115
16
-
17
117
Pump magnet circuit breaker
18
118
High pressure partialisation
19
119
Low pressure partialisation
20
120
Pressing line temperature partialisation
21
121
22/10 – 6343841_04
Causes
This signal intervenes if the contact relative to the magnet circuit breaker switch protecting the MTC
compressor opens (Table 2, contact ID1, clamps M7.1 - M7.2, normally closed)
This signal intervenes if the contact relative to the magnet circuit breaker switch protecting the MTV fans
opens (Table 2, contact ID6, clamps M7S.3 - M7S.4, normally closed) This code is displayed only if the
board is used as a board spare part with SW up to version 3.6.
This signal DOES NOT give the state of the high pressure switch itself but of the compressor switch. The
high pressure switch operates directly on the compressor switches. If the board commands compressor
switch-on and the switch does not become active after 3 seconds, this signal occurs. This alarm can also
High pressure switch
be caused by an operating defect of the return relay from the compressor switch to the board (indicated
as RAP in the wiring diagrams). This signal occurs if the compressor switch deactivates during operation.
AP (Table 2, contact ID4, clamps M7.7 – M7.8, normally closed)
Flow switch
This signal occurs with the opening of the contact relative to the differential flow switch or pressure
switch; this alarm is not relative for the first 40" from pump start-up. The machine blocks in alarm mode
when the maximum number of flow switch interventions allowed (expressed by the set_factory param-
eter (y): default 5) is exceeded. If the frost protection in standby mode is activated (and therefore also the
pump), the state of the flow switch is also controlled. FL/PD (Table 2, contact ID2, clamps M7.3 – M7.4,
normally closed)
This signal intervenes when the contact relative to the low pressure switch opens (compressor intake).
Low pressure switch
BP (Table 2, contact ID5, clamps M7S.1 – M7S.2)
No water inlet probe
This signal occurs when the water inlet probe is disconnected
No water outlet probe
This signal occurs when the water outlet probe is disconnected
This signal occurs when the anti-freeze threshold is reached (set_installer (6) default: 3°C) from the out-
put water temperature. The pre-alarm state is exited with outlet water temperature temperature ex-
Water freezing
ceeding the set_installer (6) + set_factory (J) (default 3+1=4°C). The anti-freeze alarm is suspended (in
heating mode) for a period of time equal to 3' (set_factory parameter (H)) from compressor switch on.
No pressing line probe
This signal occurs when the water outlet probe is disconnected
This signal occurs when the temperature of the pressing line gas (SGP probe) exceeds the threshold en-
visioned by the parameter (set_factory (6), default 135°C). The pre-alarm state is exited with set_factory
(7) temperature (default 135 – 10 = 125 °C)
This signal occurs when the compressor flow transducer is absent and the machine is set as heat pump
or the presence of the DCP is set
This signal occurs when the transducer detects a flow pressure over the set-factory parameter threshold
High pressure
(8) (default: 40 bar). The pre-alarm state is exited with set_factory (8) – set_factory (b) pressure (default
40 – 2 = 38 bar)
No defrosting probe
This signal occurs when the defrosting probe is absent and the machine is set as heat pump
This signal occurs when the compressor flow transducer indicates an intake pressure below the thresh-
old set by the set_factory (9) parameter in cooling mode (default 4 bar), set_factory(A) ion heating
mode (default 2 bar). The pre-alarm state is exited when the intake pressure exceeds the intervention
Low pressure
set_factory(b) threshold default equal to 2 bar. The low pressure alarm is suspended in heating mode
for a period of time equal to 3' (set_factory parameter (H parameter) from compressor switch on. It is
permanently suspended during cycle reverse.
Every time the machine is powered, the control checks compressor behaviour once via the yield control
Low performance
procedure (see paragraph 8.1); this control is disabled from dip switch
This signal intervenes if the magnet circuit breaker switch protecting the pump is opened. MTP (table 2,
contact ID3, clamps M7.5 – M7.6, normally closed). This code is displayed only if the board is used as a
board spare part with SW up to version 3.6.
This signal occurs every time a partialisation takes place due to the threshold mentioned in paragraph
8.5 being reached. The machine blocks in alarm mode when the maximum number of partialisation
interventions allowed (expressed by the set_factory (5) parameter: default 5) is exceeded. With inverter
machine mode, it also indicates a partialisation due to high compression ratio.
This signal occurs every time a low pressure partialisation takes place, par. 8.5. The machine blocks in
alarm mode when the maximum number of partialisations allowed (expressed by the set_factory (5)
parameter: default 5) is exceeded.
This signal occurs every time a pressing line temperature partialisation takes place (par. 8.5), the ma-
chine blocks in alarm mode when the maximum number of partialisation interventions (expressed by
the set_factory (5) parameter: default 5) permitted is exceeded.
Error in detection of the back emf. This error is returned by the inverter control board and is linked to
Bemf error
compressor peak problems (longertek 4 code or longertek 20 code)
allows to display the list of alarms (with index and cause indicated
Note
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