MAINTENANCE INSTRUCTIONS
57
Modulation circuit board
(see fig. 1-2)
• Open the control panel (see 6.4 “Accessing the water
heater”);
• 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 water heater (see 5.3 “Gas data”);
The preset parameters of the printed circuit
board correspond to an instantaneous type
water heater fed by natural gas.
When replacing the modulation circuit board,
check the “Minimum heating flow rate” –
Parameter 19 and “Max Heating power” –
Parameter 20.
Electric fan circuit board
(see figs. 1-2)
• Open the control panel (see 6.4 “Accessing the water
heater”);
• Disconnect the two connectors from the circuit board,
unscrew the two fixing screws and remove the 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.
electric fan circuit board
modulation circuit board
Fig. 1
electric fan circuit board
modulation circuit board
Fig. 2
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