14
N.B. If the attempt to reset the appliance does not activate operation, con-
tact the Technical Assistance Service.
3a SWITCHING OFF
Temporary switch-off
In case of absence for short periods of time, set the mode selector (fig.
42) to (OFF).
In this way (leaving the electricity and fuel supplies enabled), the boiler is
protected by the following systems:
Anti-frost device:
when the temperature of the water in the boiler falls
below 5°C, the circulator and, if necessary, the burner are activated at mini-
mum output levels to bring the water temperature back to the values for
safety (35°C). During the anti-frost cycle, the symbol
(fig. 46) appears
on the digital monitor.
Circulator anti-blocking function:
an operation cycle is activated every
24 hours.
DHW Antifreeze
(only when connected to an external storage tank with
probe): the function is activated if the temperature measured by the storage
tank probe drops below 5° C. A heat request is generated in this phase with
the ignition of the burner at minimum power, which is maintained until the
water temperature reaches 55° C. During the anti-frost cycle, the symbol
(fig. 46) appears on the digital monitor.
Switching off for long periods
In case of absence for long periods of time, set the mode selector (fig. 42)
to (OFF).
Turn the main system switch OFF.
Close the fuel and water taps of the heating and domestic hot water sys-
tem.
In this case, anti-frost device is deactivated: drain the systems, in case of
risk of frost.
4A LIGHT SIGNALS AND FAULTS
The control panel has three LEDs that indicate the boiler operating status:
Green LED
Flashing
Flashing (0.5 seconds on, then 3.5 seconds off) = boiler in standby, there
is no flame.
Flashing (0.5 seconds on, then 0.5 seconds off) = temporary shutdown of
the appliance due to the following automatic-reset faults:
- water pressure switch (standby time 10 minutes approximately)
- transitory waiting for ignition.
In this phase, the boiler waits for restoration of working conditions. If after
the standby time, the boiler does not restore regular operation, the shut-
down will be permanent and the signal light will be red.
Fast flashing (0.1 second on; then 0.1 second off; for 0.5 seconds) = Auto
-
matic Temperature Control System input/output function (fig. 45).
Setting the heating water temperature selector in the zone marked by
AUTO (temperature value from 55 to 65°C) activates the Automatic Tem-
perature Control System: the boiler varies the output temperature accord-
ing to the closing signal of the room thermostat.
When the temperature set with the heating water temperature selector is
reached, a 20-minute countdown begins. If during this period the room
thermostat still requests heat, the value of the set temperature automati-
cally increases by 5°C.
When the new value is reached, other 20-minute countdown begins. If dur-
ing this period the room thermostat still requests heat, the value of the set
temperature automatically increases by 5°C. This new temperature value
is the result of the temperature set manually with the heating water tem-
perature selector and the increase of +10°C of the Automatic Temperature
Control System (S.A.R.A.) function.
After the second cycle, the temperature value is not increased any further
(set tempe10°C) and cycle described above is repeated until the
room thermostat request is met.
Fixed green
there is flame, the boiler works regularly.
To restore operation (deactivate alarms):
Faults A 01-02-03
Position the function selector to (OFF), wait 5-6 seconds then set it to
the required position.
If the reset attempts do not reactivate the boiler, contact the Technical As-
sistance Centre.
Fault A 04
In addition to the fault code, the digital display shows the symbol .
Check the pressure value indicated by the water gauge:
if it is less than 0.3 bar, position the function selector to (OFF) and adjust
the filling tap until the pressure reaches a value between 1 and 1.5 bar.
Then position the mode selector to the desired position.
The boiler will perform one purge cycle lasting approximately 2 minutes.
If pressure drops are frequent, request the intervention of the Technical
Assistance Service.
Fault A 06
Contact the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
Fault A 08
Contact the Technical Assistance Centre.
Fault A 09 with fixed red LED lit
Position the function selector to (OFF), wait 5-6 seconds then set it to
the required position.
If the reset attempts do not reactivate the boiler, request the intervention of
the Technical Assistance Service.
Fault A 09 with flashing red and green LEDs
Contact the Technical Assistance Centre.
Fault A77
This is an automatic-reset fault, if the boiler does not restart, contact the
Technical Assistance Centre.
Flashing yellow LED
Combustion analysis in progress.
DESCRIPTION
DISPLAY CODE
RED LED
YELLOW LED
GREEN LED
Flame lockout
A01
ON
OFF
OFF
Limit thermostat intervention
A02
flashes
OFF
OFF
Fan fault
A03
ON
OFF
OFF
Water pressure switch fault
A04
ON
OFF
ON
Domestic hot water NTC probe fault
A06
flashes
OFF
flashes
Fault on heating delivery NTC probe or delivery-return
differential circuit-breaker
A07
ON
OFF
OFF
Fault on heating return NTC probe or return-delivery dif-
ferential circuit-breaker
A08
ON
OFF
OFF
Intervention of thermal safety device on flue gas probe
A09
ON
OFF
OFF
Flue gas NTC probe or heat exchanger cleaning
A09
flashes
OFF
flashes
Intervention of low temperature thermostat - general
alarm
A77
ON
OFF
OFF
Combustion analysis procedure in progress
ACO
OFF
flashes
OFF
