Bosch Worcester Greenstar 8000 Series - Checking;Replacing the Motor of the 3-Way Valve; Replacing the Optional 3-Way Valve; Following Inspection;Maintenance

Replacement parts
Greenstar 8000 Style – 6720883855 (2019/01)
66
1. Unplug the plug.
2. Unscrew the union nut.
Fig. 100 Unplugging the plug and unscrewing the union nut
1. Remove the 2 screws.
2. Remove the air/gas ratio control valve.
Fig. 101 Removing the gas control valve
▶ Install the air/gas ratio control valve in reverse order, and check the
gas/air ratio.
9.6 Checking/replacing the motor of the 3-way valve
▶ Check the motor in the Menu > Function check > Activate test > 3-way
valve.
▶ Check/replace the motor of the 3-way valve in the Service menu >
Special function > 3-WV mid. pos. > Yes.
1. Pull out the motor.
2. Press the cable retaining clip.
3. Unplug the plug.
Fig. 102 Removing the motor of the 3-way valve
9.7 Replacing the optional 3-way valve
▶ Remove the screws.
▶ Pull out the 3-way valve.
▶ Press the cable retaining clip.
▶ Unplug the plug.
Fig. 103 Removing the 3-way valve
9.8 Following inspection/maintenance
▶ Re-tighten all the threaded connections that have been released.
▶ Restart the appliance.
▶ Check tightness of all joints.
▶ Check the gas/air ratio.
▶ Fit the combustion casing, side-, top panels and front cover.
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