Diverter valve (see fig. 1)
Replacing the motor
• Unscrew the fixing screws securing the transparent
cover of the diverter valve and remove the cover;
• Unscrew the two motor fixing screws and disconnect
the wires;
• Replace the motor and re-assemble the components
following the above procedure in reverse order;
• Replace the motor and re-assemble the components
following the above procedure in reverse order;
Replacing the diverter valve
• Close the shut-off valves and drain the central heating
circuit of the water heater;
• Disconnect the joints securing the valve to the pipes;
• Replace the valve body and re-assemble the
components following the above procedure in reverse
order;
• Switch on the electricity, water and gas supplies and fill
the system with water. Check for any leaks from the
joints and bleed off any air from the circuit. Restart the
water heater.
Modulation circuit board (see fig. 2-3)
• 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. 2-3)
• 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.
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