6 720 611 400 GB (03.11)
42
Maintenance
Alternatively
B
After removing the siphon release the four Allen
screws and remove and replace the pump head.
Fig. 58
9.3.4
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. 59.
B
Pull out retaining clip.
B
Remove motor.
B
Disconnect the relief valve drain.
B
Disconnect the pressure gauge by withdrawing the
clip and pulling out the capillary head.
B
Undo pipe unions by withdrawing the clips.
B
Remove 3-way valve.
Fig. 59
After refitting:
B
Fill system, bleed and re-pressurise
(see Installation Instructions).
9.3.5
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. 59.
B
Pull out retaining clip.
B
Remove motor.
9.3.6
Sensors
B
Check that the appliance is electrically isolated.
Central Heating Flow Temperature Sensor –
Item 36, fig. 2, 55
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, 55
B
Pull-off the connectors.
B
Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 55
B
Pull-off the connectors.
B
Unscrew the sensor.
1.
1.
2.
3.
4.
5.
7 181 465 330-03.1R
7 181 465 330-12.1R