SERVICING AND SPARES
6 720 815 724 (2015/11) 49
26. Hydraulic block
▶ Ensure the appliance has been fully drained.
▶ Disconnect the electrical connections to the NTC, Turbine and pump.
▶ Undo the nuts securing the copper water pipes to the manifold (there
is no need to remove the gas pipe).
▶ Disconnect drain pipe from drain tap
(see e. g. step 1 in Fig. 94).
▶ Release the spring clips securing these water pipes to the plastic
housing and remove the pipes.
1. Release the spring clip securing the expansion vessel pipe to the
plastic housing and remove the pipe.
2. Undo the nut securing the pressure gauge to its bracket and remove
the gauge.
3. Release the locking devices that secure the two copper water pipes
leading to the combustion chamber by squeezing the two tabs
together and rotating anticlockwise (viewed from above).
4. Undo the two screws securing the hydraulic block to the chassis
(located top left/top right of the housing).
5. Lift the left hand side of the block slightly.
6. Manoeuvre the block out, starting with the right hand side.
7. Pull the hydraulic block completely out of the boiler.
▶ Take care not to snag the harness or pressure gauge bracket.
▶ To refit, follow the above in reverse.
Ensure any seals that have been disturbed are renewed.
Fig. 95
The block will still contain a small amount of water, which
will spill if the block is tilted.
1.
4.
4.
2.
3.
5.
6.
7.
6 720 812 175-24.1O
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