Pump Motor Replacement; Replacing The Expansion Vessel; Replacing The Pcb - Baxi 224 Combi 2 Installation And Service Manual

Fig.78 Removing the pump
Fig.79 Accessing the parameters
F1 F1 F1 F2 F3 F4
10.4.4
1. Hinge the control box down.
2. Close the flow and return isolation taps and drain the boiler primary
circuit. Disconnect the electrical plugs from the pump motor.
3. Undo the screws securing the body to the pipe and manifold and
draw the pump forward to remove.
4. Examine the 'O' ring seals on the return pipe and manifold, replacing
if necessary.
5. Reassemble in reverse order.
PN-0000238
10.4.5
Before replacing the expansion vessel, proceed as detailed below:
1. Disconnect the power supply to the boiler.
2. Close the gas cock.
3. Close the main domestic water tap.
4. Close the heating system return and flow cocks.
5. Open the boiler drain cock.
The expansion vessel is inside the boiler on the side, to the right.
10.4.6
After replacing the main board, power up the boiler electrically.
Parameters CN1 and CN2 will automatically appear on the display.
Modify the parameters with the data shown on the serial number plate:
Turn knob
Press the F4 key to store the set value.
Parameters CN1 and CN2 can also be accessed from the main menu to
carry out the replacement. Press the two external buttons on the control
panel simultaneously for about 40 seconds.
BO-7763705-8
Pump - replacement
Warning
Take precautions to protect other components from water damage
when removing the pump and auto air vent.

Replacing the expansion vessel

Replacing the PCB

to modify the parameters;
Caution
Please note that resetting the CN1 and CN2 settings with data on
the data plate deletes any previous setting. If changing the gas,
for example, remember to set the correct calibration for the gas
valve.
10 Maintenance
Combi 2
71