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14 Replacement of parts
14590
Diagram 14.19
Diagram 14.20
14.18 R.H. and L.H. Hydroblock
For access, refer to section 14.1.
Drain the boiler circuit, refer to section 14.2.
Refer to diagram 14.12.
Remove the secondary heat exchanger, see section 14.12.
Remove the pump assembly, see section 14.9. and 14.10.
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 easy removal of the left section of the hydroblock.
Disconnect the three way valve motor, electrical connection
and remove the motor by releasing the clip, see section
14.21.
Release the nut connecting the CH outlet connection to the
hydroblock.
Disconnect the DHW sensor, see section 14.3.
Remove the screw securing the left part of the hydroblock to
the combination boiler.
Fit the replacement hydroblock parts in reverse order to
removal ensuring all seals are correctly located and replaced
if necessary.
Open the isolating valves on the flow and return connections,
refill, vent and pressurise boiler ensuring all joints are sound.
14.19 Filter
For access, refer to section 14.1.
Drain the boiler circuit, refer to section 14.2.
Refer to section 12.5. to remove.
Remove the filter in the inlet to the hydroblock.
Clean or fit a replacement filter.
Fit the components in reverse order of removal, ensuring all
seals are correctly located and replaced if damaged.
Open the isolating valves on the flow and return connections,
refill, vent and pressurise the boiler ensuring all joints are
sound.
14.20 Flow sensor
For access, refer to section 14.1.
Refer to diagram 14.19.
Remove the flow sensor using a pair of pliers.
Fit a replacement sensor in reverse order to removal.
14.21 Three way valve motor
For access, refer to section 14.1.
Refer to diagram 14.20.
Ensure that the electric supply to the boiler is switched OFF.
Remove the electrical connection to the three way valve
motor.
Remove the clips connecting the valve to L.H. hydroblock.
Fit the replacement valve in reverse order ensuring the valve
is fitted properly.
UNCLIP
TO REMOVE
THREE WAY
VALVE MOTOR
14562
ELECTRICAL
CONNECTION
ELECTRICAL
CONNECTION
FLOW
SENSOR
CLIP