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It is the law that any service work must be carried out by a competent person, i.e. CORGI registered personnel.
Warning: Before replacing any boiler components, isolate the electrical supply and close the boiler gas service cock. Allow the
boiler to cool.
Always test for gas soundness after replacing any gas carrying components or disturbing any gas connections.
Always carry out electrical system checks i.e. Eart Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable
meter after servicing.
Check the operation of the boiler. (Refer to Boiler Operation, Section 6).
Ensure that all the controls are returned to their original settings.
The replacement of components in Sections 8.3 to 8.15 does not require draining of the boiler.
8.1 GENERAL ACCESS - Fig. 25
Isolate the electrical supply and close the boiler gas cock (see Fig. 13).
1. If access is required behind the control panel - Release the fixing screw located at the top of the case front panel and lift
the panel upwards from its locating pins and then forwards from the boiler. Remove the two fixing screws that secure the control
panel and lower the panel.
2. To gain access to the control panel components - Remove the five screws securing the rear cover and carefully raise
the cover from the control panel. When replacing the cover, ensure no wires are trapped and all wiring is secured. Secure
with screws previously removed - do not overtighten.
3. To gain access behind the room sealed chamber panel - Remove the six screws securing the room sealed chamber
panel and remove the panel, taking care not to damage the seal.
Note: When replacing the panel, ensure the seal is intact and that the panel has been located correctly.
8.2 DRAINING THE BOILER - Refer to Figs. 2 or 25
1. Isolate the electricity supply and close the boiler gas service cock (see Fig. 13). Allow the boiler to cool.
2. Gain access as described in Section 8.1. Connect a hose to the drain valve located in the flow pipe just above the heat
exchanger (see Fig. 25) and route it to a suitable container. Open the drain valve.
Note: Water will remain in the heat exchanger and care must be taken when removing it to prevent any electrical
components from becoming wet.
8.3 ELECTRODES - See Fig. 26
Gain access behind the room sealed chamber panel as in Section 8.1.
1. Ignition electrode and lead
Disconnect the lead from the ignition generator, noting its position.
Remove the two screws securing the electrode to the front of the combustion chamber and carefully withdraw the electrode.
2. Flame sensing electrode and lead
Remove the grommet in the bottom of the chamber, disconnect the flame sensing electrode in-line connector and
withdraw the lead.
Remove the two screws securing the electrode to the front of the combustion chamber and carefully withdraw the electrode.
3. Ignition electrode
Remove the two screws securing the electrode to the front of the combustion chamber and carefully withdraw the electrode.
Re-assemble in reverse order
8.4 MAIN BURNER - Fig. 26
1. Remove the burner assembly as described in Routine Servicing, Section 7.2.
2. Remove the four screws securing the burner to the combustion chamber front assembly.
3. Re-assemble with a new burner as described in Routine Servicing, Section 7.4.
8.5 BURNER INJECTOR - Fig. 25
1. Gain access behind the room sealed chamber panel as described in Section 8.1.
2. Undo the gas inlet pipe union to the combustion chamber front to gain access.
3. Unscrew the damaged injector and screw in a replacement.
4. Re-assemble in reverse order.
8.6 FAN - Fig. 27
Alpha CD13R, 18R, 24R - Component Replacement
8 COMPONENT REPLACEMENT
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