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18.14 Pressure Sensor
•
Read the notes at the head of this section before commencing
any work on the appliance.
•
Disconnect and remove the sensor cable and sensor from
the hydroblock. (fi gure 48)
•
Fit the replacement pressure sensor in reverse order ensuring
the gasket is correctly fi tted. (Replace the gasket if damaged)
18.15 Hydroblock
•
Read the notes at the head of this section before
commencing any work on the appliance.
•
Remove the secondary heat exchanger as detailed in 18.7.
•
Remove the pump with the hydroblock section as detailed
in 18.6.
•
Remove the section of the hydroblock from the pump by
releasing the clip.
•
Release the heat-exchanger outlet pipe nut
and rotate the pipe for ease of removal from the
remaining section of the hydroblock as described
in 18.2.
•
Disconnect the three way valve stepper motor
electrical connection and remove the stepper motor
by releasing the clip as described in 18.17
•
Release the nut connecting the CH outlet
connection to the hydroblock (fi gure 49).
•
Disconnect the DHW sensor as described in 18.1.
•
Remove the screw securing the remaining section of the hydroblock to the combination
boiler (fi gure 50).
•
Fit the replacement hydroblock sections (fi gure 51) in reverse order of removal
ensuring all components are assembled correctly. Replace any seals or gaskets as required.
Figure 48
Figure 49
Figure 50
40
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