6 720 610 576 GB (03.02)
40
Maintenance
8.3.6 Sensors
B Check that the appliance is electrically isolated.
Central Heating Flow Temperature Sensor –
Item 36, fig. 2, 59
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, 59
B Pull-off the connectors.
B Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 59
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.
8.3.7 Gas Valve
B Check that the gas cock is turned off.
B Lower the control panel. Refer to fig. 62.
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. 61.
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.
Fig. 64
6 720 610 602 - 04.1O
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