SERVICING AND SPARES
6 720 803 599 (2012/06)
40
3. PRIMARY SENSOR
B
Press retaining clip on plastic moulding and pull upwards until clear of
pocket in heat exchanger.
B
Separate sensor from connector, coat new sensor with heat
conductive paste and replace.
4. OVERHEAT THERMOSTAT
B
Remove two electrical connectors from thermostat.
B
Unscrew the sensor.
5. FLUE LIMIT THERMOSTAT
B
Remove electrical connections.
B
Push the flue limit thermostat into the sump.
B
Retrieve the thermostat from the sump well.
6. EXPANSION VESSEL
B
Drain the appliance.
6.1
Remove locking screw (D).
6.2
Undo the union connection (E) at the bottom of the expansion
vessel.
B
Remove expansion vessel from boiler.
B
Set the pressure of the new vessel to that required by the system.
Fig. 54 Replacing parts
3.
4.
5.
6.1
6.2
D
E
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