57
Modulation circuit board
(see
fi
g. 33-34)
●
Open the control panel (see 7.3 “Accessing the
boiler”);
●
Disconnect all the connectors, remove the regu-
lating knobs, unscrew the four
fi
xing screws and
remove the modulation circuit board;
●
Replace the circuit board and re-assemble the
components following the above procedure in re-
verse order;
●
Switch on the electricity, water and gas supplies
and regulate the boiler (see 6.3 “Gas data”);
modulation circuit board
Fig. 1
Fig. 2
modulation circuit board
The preset parameter of the printed circuit
board correspond to a 20/27/36 kw instantane-
ous condensing boiler fed by natural gas.
When replacing the modulation circuit board,
it’s necessary to set parameter P00 according
to the boiler model (20/27/36).
Fig. 33
Fig. 34
