55EN
cod. 3540000272 - Rev. 01 - 01/2024
Indication during operation
Heating
A heating request (generated by the Room
Thermostat or Remote Timer Control) is in-
dicated by activation of the radiator.
The display (detail 12 - fig. 1) shows the ac-
tual heating flow temperature and, during
heating standby time, the message “d2”.
fig. 2
DHW (domestic hot water)
A DHW request (generated by drawing hot
water) is indicated by activation of the
faucet.
The display (detail 12 - fig. 1) shows the ac-
tual DHW outlet temperature and, during
DHW standby time, the message “d1“.
fig. 3
Comfort
A Comfort demand (reinstatement of temperature inside the boiler) is indicated by flashing of the
Comfort symbol. The display (detail 12 - fig. 1) shows the actual temperature of the water in the
boiler.
Fault
In case of a fault (see cap. 3.4 "Troubleshooting") the display shows the fault code (detail 12 -
fig. 1) and during safety pause times the messages “d3” and “d4”.
1.3 Connection to the power supply, turning on and off
Boiler not electrically powered
B
To avoid damage
caused by freezing dur-
ing long idle periods in
winter, it is advisable to
drain all the water from
the boiler.
fig. 4- Boiler not electrically powered
Boiler electrically powered
Switch on the power to the boiler.
• During the first 5 seconds the display shows the card software version (fig. 5).
• For the following 20 seconds the display will show FH which identifies the heating system air
venting cycle with the fan running (fig. 6).
• In the next 280 seconds, the venting cycle continues with the fan off (fig. 7).
• Open the gas valve ahead of the boiler
• When the message Fh disappears, the boiler is ready to operate automatically whenever do-
mestic hot water is drawn or in case of a room thermostat request
fig. 5- Switching on / Software version fig. 6- Vent with fan on fig. 7- Vent with fan off
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