Baxi Maxflow Combi WM Installation And Servicing Instructions page 32

Main PCB
Ignition PCB
Wiring not illustrated
for clarity
32
Fig. 65
Control Box Cover
Suppressor
Blue
Brown
Mains
Brown
Green/Yellow
Relay PCB
Neon PCB
Fig. 66
11.0 Changing Components
11.10 Circuit Boards & Electrical
Components (Figs. 65 & 66)
See section 12.0 "Illustrated Wiring Diagram" for
the layout of all electrical components.
To gain access hinge the facia panel down and
remove the screws securing the control box.
Lower the control box. Undo the screws securing
the control box cover, lift the cover upwards and
allow it to rest against the appliance.
Neon PCB
1. Undo the screw securing the neon PCB to the
control panel and disconnect the plug on the
ribbon wiring from the PCB.
2. Reassemble in reverse order.
Main PCB
1. Note the position of each plug and connector
and remove them. Remove the PCB securing
screws.
2. Carefully draw the PCB away from the control
panel, disengaging it from the control knob
spindles.
3. Take the new PCB and establish the position of
the drive slots in the temperature control
potentiometers and mode selector switch.
Position the knobs such that their shafts will align
with the slots and carefully fit the new board.
4. Reconnect all plugs and connectors previously
removed and reassemble in reverse order.
Relay PCB
1. Disconnect the plug from the PCB and undo
Mains
the screw securing the PCB to the control panel.
Blue
2. Reassemble in reverse order.
Ignition PCB
1. Note the position of each plug and connector
including the earth wire and remove them.
2. Undo the PCB securing screws and remove the
board.
3. Reassemble in reverse order.
Suppressor
IMPORTANT: The new suppressor must be
wired as shown to ensure correct operation of
the boiler.
1. Ease the suppressor out of the clips on the
inner face of the control panel cover.
2. Remove each wire from the original
suppressor, one at a time and connect it to the
appropriate terminal on the new suppressor
before disconnecting any further wires.
3. Locate the new suppressor in the clips on the
inner face of the control panel cover and
reassemble in reverse order.