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Maintenance
B Remove 3-way valve.
Fig. 64
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. 64.
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, 63
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, 63
B Pull-off the connectors.
B Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 63
B Pull-off the connectors.
B Unscrew the sensor.
40
8.3.7
Gas Valve
B Check that the gas cock is turned off.
B Lower the control panel. Refer to fig. 63.
B Pull off the solenoid connections at the rear of the
valve.
B Undo the union, within the inner casing, securing the
valve to the gas/air tube. Refer to fig. 62.
B Remove the white plastic cap from the gas valve.
B Release the gas inlet union at the manifold assembly.
B Unscrew the two screws securing the gas valve
assembly bracket to the back panel and withdraw the
assembly.
B Transfer the bracket and inlet pipe assembly to the
new gas valve.
B Check for gas soundness when the new gas valve
has been fitted.
B Recheck the combustion performance as described
in section 7.1.
7 181 465 330-12.1R
6 720 610 602 - 04.1O
Fig. 65
8.3.8
Electrode assembly
B Refer to section 8.2.
B Use a new seal if the existing seal is damaged.
6 720 611 443 GB (05.04)
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