303
EN
cod. 3541V481 - Rev. 00 - 06/2021
1.3 Connection to the power supply, switching on and off
Boiler not electrically powered
B
To avoid damage caused by freezing during long idle pe-
riods in winter, it is advisable to drain all the water from the
boiler.
Boiler electrically powered
Electrically power to the boiler.
During the first 5 seconds the display shows the software version of the board and display
(fig. 7).
For the following 20 seconds the display will show
FH
which identifies the heating system air
venting cycle with the fan running (fig. 8).
In the next 280 seconds, the venting cycle continues with the fan off (fig. 9).
Open the gas valve ahead of the boiler
When the message
Fh
disappears, the boiler is ready to operate automatically whenever hot
water is drawn or in case of a room thermostat request
fig. 7- Switching on / Software version
fig. 8- Vent with fan on
fig. 9- Vent with fan off
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