Pump Motor Replacement; 10.4.11 Replacing The Expansion Vessel; Replacing The Pcb - Baxi 24 Combi Installation And Service Manual

10 Maintenance
Fig.81 Remove pump
Fig.82 Modifying the parameters
F1 F1 F1 F2 F3 F4
10.4.10 Pump - replacement
Warning
Take precautions to protect other components from water damage
when removing the pump and auto air vent.
1. Hinge the control box down.
2. Close the flow and return isolation taps and drain the boiler primary
circuit.
3. Disconnect the electrical plugs from the pump motor.
4. Prise off the securing clip that is holding the pump return pipe in po­
sition. Pull away the pipe.
5. Pull out the securing clip that is holding the pump body to the hy­
draulic inlet assembly.
6. Prise off the securing clip and disconnect the braided hose from the
pump body, taking care as water may still be in the hose.
7. Remove the screws securing the pump to the boiler bottom panel.
8. The pump should now be able to be remove.
9. Pull out the securing clip and remove the automatic air vent, trans­
fering it to the new pump body.
10. Examine all 'O' ring seals, replace if necessary and reassemble in
reverse order.

10.4.11 Replacing the expansion vessel

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.
10.4.12

Replacing the PCB

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 to modify the parameters;
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.
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.
600 Combi 2 71