7
D
E
F
G
10
13
9
45
H
15. 3-Way valve
Drain boiler as in step 12. Remove the 2
clips on the 3 way valve hydraulic motor
48 Fig. 5. Pull up the motor .Turn anti-
clockwise the 3 way valve body, rise it up
using a screw driver and remove it.
Reassemble in reverse order.
16. Secondary heat exchanger 45
Drain both circuits of the boiler as in step
12. Unscrew the 2 fixing screws D and
remove the DHW exchanger from the
front. Prior to reassembly, check that the
4 gaskets are correctly positioned. The
heat exchanger is so designed that it can-
not be remounted incorrectly.
17. Main heat exchanger
and insulation pads
Carry out steps 1 and 2 as above. Drain
boiler as in step 12. Remove the 2 clips E
located on return and flow pipes and pull
them downwards. Pull the main exchang-
er toward you to remove. Reassemble in
reverse order.
To replace insulation pads carry out the
above procedure. To remove the pads
bend down the retaining clips and retract
the pads.
Reassemble in revers order
18. Pump
Drain the boiler as in step 12. Open the
electrical box cover removing the 2
screws. Remove the main lead connec-
tion. Open the electrical box, 2 clips G.
Remove the pump plug from the control
board and earth plug from earth socket.
Pivot the electrical box downwards.
Unscrew the nut F of the flow pipe from
the volute. Remove the clip H on the
pump volute and pull pump toward you.
Remove the back clip.
Reassemble in reverse order.
19. Pressure relief valve
Drain the boiler first, unscrew the safety
valve head with a 24 mm spanner.
Reassemble in reverse order.
20. Thermistors
Drain the boiler as step 12. Disconnect
the plug, remove the retaining clip for the
DHW thermistor 10 and unscrew the nut
for the CH thermistor 9, pull the thermistor
out. Reassemble in reverse order.
10 = DHW thermistor
9 = Heating thermistor
21. Safety thermostat
Remove the casing as step 1 unscrew
four self tapping screws securing the
sealed chamber front panel. Disconnect
the 2 cables, pull out the sensor with the
clip 13. Reassemble in reverse order.
22. Control board
Carry out step 1, open the electrical box
cover as mentionned in step 5. unplug all
cables from the PCB remove earth plug
from earth socket undo the screw fixing
the PCB. Hang out the control board.
Reassemble in reverse order.
23. Expansion vessel
Remove the casing as step 1 and drain
the boiler as step 12 above. Unscrew the
connecting nuts and lift out the boiler from
the wall. Place it on a side on the floor.
Remove the expansion vessel bracket
retaining screws, disconnect the pipe
from the vessel and pull it toward you.
Reassemble in reverse order.
