18 | Maintenance (only by authorised service technician)
Water filter
▶ Close the cold water inlet isolation valve.
▶ Unscrew the water filter on the cold water pipe.
▶ Clean the water filter.
-or-
▶ Replace if required
Fig. 11
Water filter
6.2
Replacement of the fuse (electronic control
unit)
▶ Open the electronic control unit.
▶ Remove the PCB from the electronic control unit.
▶ Replace the fuse located in the corner of the circuit board.
Fig. 12
Fuse replacement
6.3
Start-up after completion of maintenance
▶ Re-tighten all of the connections.
▶ Check the burner pressure.
▶ Check air tightness of the flue circuit with the front cover
fitted.
▶ Check that there are no gas or water leaks.
6 720 817 545 (2016/02)
1
6720817545-05.1V
2.
1.
6720817545-06.1V
Optiflow