Bosch Optiflow GWH20 3 CT E23 F6 L S2405 User Manual

6 720 817 545 (2016/02) Optiflow
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.
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Bosch Optiflow GWH20 3 CT E23 F6 L S2405 Specifications

General

Model	Optiflow GWH20 3 CT E23 F6 L S2405
Category	Water Heater
Brand	Bosch
Fuel Type	Natural Gas
Water Connection	1/2 inch
Energy Efficiency Class	A
Nominal Heat Output	20 kW
Hot Water Flow Rate	10 L/min
Water Flow Rate	10 L/min
Gas Type	Natural Gas
Ignition Type	Electronic
Width	350 mm
Depth	180 mm
Type	Gas Water Heater
Gas Connection	1/2 inch