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4000123942-2
18 Replacement of Parts
18.16 User interface board, refer to diagram
18.10.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Disconnect the electrical connections from the user inter face
board.
• Remove the two user inter face board retaining screws.
• Remove the user inter face board.
18.17 Mains switch, refer to diagram 18.10.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Disconnect the electrical connections from mains switch.
• Remove the mains switch.
18.18 230V Controls board, refer to diagram
18.10.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Disconnect the electrical connection from the 230V controls
board and the electrical connection from printed circuit board
(PCB).
• Remove the 230V controls board retaining screw.
• Remove the 230V controls board.
18.19 (24ci Only) Analogue programmer, refer
to diagram 18.10
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Unclip control panel user interface and hinge forward. Do not
strain the cables.
• Disconnect the electrical connection from the programmer.
• Undo the two securing screws and remove the programmer.
18.20 Central heating pump head, refer to
diagram 18.11.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Drain down central heating water circuit of the boiler only,
refer to relevant part of diagram 18.1.
Note: it is not necessary to drain down the entire heating
system to carry out this work.
• For ease of access if required remove the right hand side
panel, refer to Section 15.6.
• Undo four head fixing screws and remove pump head.
• Gain access to the pump electrical connection box and
remove cover.
• Disconnect pump cable from pump (avoid straining cables).
• Connect electrical connection to replacement pump head.
• Fit replacement pump head.
Diagram 18.11
9823
PUMP
HEAD
PUMP
ELECTRICAL
CONNECTION
BOX
HEX HEAD SCREW (4 OFF)
➜
➜
CONTROL PANEL
11659
Diagram 18.10
USER INTERFACE BOARD
➜
➜
11660
➜
MAINS SWITCH230V CONTROLS BOARD
24ci shown
➜
➜
➜
PROGRAMMER
24ci shown
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