Modulation circuit board
(see fig. 1-2)
• Open the control panel (see 6.3 “Accessing the
boiler”);
• Disconnect all the connectors, remove the
regulating knobs, unscrew the four fixing screws and
remove the modulation circuit board;
• Replace the circuit board and re-assemble the
components following the above procedure in
reverse order;
• Switch on the electricity, water and gas supplies
and regulate the boiler (see 5.3 “Gas data”);
The preset parameters of the printed circuit
board correspond to a 18 or 25 kw
instantaneous condensing boiler fed by
natural gas.
When replacing the modulation circuit board,
it’s necessary to set parameter P00 according
to the boiler model (18-25).
modulation circuit board
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