8
The level bar indicates whether the boiler is operating with a modulation range of 0 to 50%
= or 51% to 100% = .
The boiler continues to function until the temperatures set on the boiler are reached, or the
heat request terminates; it will then go back to standby.
In the event of shutdown due to a fault, the digital display will show the relevant error code
and, in the case of a non-volatile error, the
fl
ame lockout symbol
.
4.5
Warning lights and faults
The lockout condition stops the boiler from operating and is indicated on the display by a
fl
ashing letter "
A
", followed by an error code and the appearance of the
symbol.
In this condition, to restore normal operation the reset procedure must be carried out as
follows:
-
press the RESET button
RESET
RESET
-
wait for the ignition delay after the lockout:
t5, remaining time before restart more than 30 sec
or
t4, remaining time before restart less than 30 sec.
When the error is cleared, the relevant code disappears from the display and normal
operating mode is automatically restored. If the anomaly persists, you must contact the
Technical Assistance Service.
Table of anomalies needing RESET
Flame lockout alarm
A01
Limit thermostat/Post-exchanger thermal fuse
A02
Gas valve malfunction
A16
Parasite
fl
ame/false
fl
ame
A11
Air intake/
fl
ue gas exhaust obstructed
A03
Loss of
fl
ame 3 times in the last 10 minutes
A12
Poor combustion 3 times in the last 10 minutes
A83
Gas valve fault/wiring fault
A82
Fault
A02
If, after RESET procedure, alarm A02 does not reset, it would be possible that the post-exchan-
ger thermal fuse, in series with the limit thermostat, has intervened. Ask for the intervention of
the Technical Assistance Center to resolve the fault.
The boiler could also detect the following "self-resetting" error situations which do not result
in a lockout condition. The boiler tries to reset automatically.
In this condition, the display shows the
fl
ashing letter "
A
", followed by an error code, but
there is no
symbol.
When the error is cleared, the relevant code disappears from the display and normal
operating mode is automatically restored.
Self-resetting anomalies table
Low water pressure/condensate limit
A04
CH NTC sensor
A07
T Domestic hot water NTC sensor
A06
Gas valve modulator
A17
Insuf
fi
cient water circulation
A18
Poor combustion warning
A23
Outdoor temperature sensor fault
A48
Low supply voltage/abnormal mains frequency
A80
Fan defective or not connected/fan wiring fault
A34
CH NTC sensor over-temperature
A74
Fault A04
-
Low water pressure
together with the error code, the
symbol
fl
ashes on the display to indicate the need
to re
fi
ll the system. Check the pressure value indicated by the water gauge: if it is less
than 0.5 bar press MODE to select the OFF mode and operate the
fi
lling tap (
B
) until the
pressure reaches a value between 1 and 1.5 bar.
When the automatic air vent cycle is
fi
nished or when it is interrupted by pushing RESET
button, press MODE to select the desired function.
If pressure drops are frequent, request the intervention of the Technical Assistance
Service.
B
After the system pressure (1 and 1.5 bar) compliance verifi ed, the continuous presence of A04
fault code can be due to the intervention of the condensate limit pressure switch (siphon or
condensate drain blocked). In this case, it is necessary to ask for the intervention of the
Technical Assistance to resolve the fault.
Fault A06
If alarm A06 persists in any operating mode, it means the DHW probe is faulty.
The boiler will carry on working normally, modulating to suit the
fl
ow sensor.
Burner OFF = Delivery temperature > DHW se 15 °C
Burner ON = Delivery temperature < DHW se 10 °C
To replace the DHW probe, contact the after sales service.
4.6 Temporary switch-off
In the event of temporary absences (weekends, short trips, etc.) press the MODE button,
the display will show OF.
While the electrical supply and the fuel supply remain active, the boiler is protected by the
systems:
-
CH anti-freeze :
this function is activated if the temperature measured by the outlet
fl
ow
sensor drops below 5 °C. In this phase, the circulator is activated. If the boiler is not in
lockout, the burner is also activated at minimum output until the delivery water tempera-
ture reaches 30°C.
During the antifreeze cycle the display shows F08.
-
DHW anti-freeze:
the function is activated if the temperature measured by the domestic
water sensor drops below 4° C. In this phase, the circulator is activated. If the boiler is
not in lockout, the burner is also activated at minimum output until the delivery water
temperature reaches 40°C.
During the antifreeze cycle the display shows F09.
4.7
Switching off for long periods
If the boiler is not going to be used for a long period, perform the following operations:
-
press the MODE button and select OF
-
set the system's main switch to "off"
-
turn off the fuel and water taps of the heating and domestic hot water system.
MODE
MODE
