Bosch Worchester GREENSTAR ZWB 7-27 HE combi - 3-Way Diverter Valve; 3-Way Diverter Valve Motor; Sensors

6 720 610 576 GB (02.05)
40
Maintenance
8.3.4 3-way diverter valve
B Switch off the appliance.
B Disconnect appliance from the power supply.
B Turn off service cocks.
B Unplug connector from 3-way valve motor. Refer to
fig. 62.
B Pull out retaining clip.
B Remove motor.
B Disconnect the relief valve drain.
B Disconnect the pressure gauge.
B Undo pipe unions.
B Remove 3-way valve.
Fig. 62
After refitting:
B Fill system, bleed and re-pressurise
(see Installation Instructions).
8.3.5 3-way diverter valve motor
B Switch off the appliance.
B Turn off the service cocks.
B Unplug connector from 3-way valve motor. Refer to
fig. 62.
B Pull out retaining clip.
B Remove motor.
8.3.6 Sensors
B Check that the appliance is electrically isolated.
Central Heating Flow Temperature Sensor –
Item 36, fig. 2, 58
B Pull-off the connector.
B Release the sensor clip and withdraw the sensor.
B Apply heat transfer paste to the replacement sensor.
Safety Temperature Limiter – Item 6, fig. 2, 58
B Pull-off the connectors.
B Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 58
B Pull-off the connectors.
B Unscrew the sensor.
Domestic Hot Water Temperature Sensor –
Item 6.1, fig. 2
B Check that the inlet water valve is closed and the
domestic hot water circuit is drained.
B Release and pull-off the connector.
B Unscrew the sensor.
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