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7 COMPONENT REPLACEMENT
To ensure correct and safe operation of the appliance, it is essential that any worn or failed components are replaced with
only genuine Alpha spare parts. Use of non-genuine Alpha spares could invalidate your warranty and may pose a potential
safety hazard.
It is the law that any service work must be carried out by a competent person, i.e. Gas Safe registered boiler engineer.
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 tightness before and after replacing any gas carrying components or disturbing any gas connections.
Always carry out electrical system checks i.e. Earth Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable
meter after servicing.
Check the operation of the boiler. (Refer to Sections 5.5 and 5.6).
Ensure that all the controls are returned to their original settings.
7.1 GENERAL ACCESS
Ensure the electrical supply is isolated and the gas supply is off.
Gain access by removing the control panel cover, case front panel and lowering the control panel as described in
Section 6.2.
7.2 DRAINING THE BOILER - Figs. 2.2 and 4.4
Isolate the electricity supply and close the boiler gas service cock, see Fig. 4.4. Allow the boiler to cool.
Heating circuit
1. Close the central heating flow and return valves, see Fig. 4.4.
2. Connect a suitable pipe to the drain point, see Figs. 4.4 and 6.7 and route it to a suitable container. Open the drain point.
Hot water circuit
1. Close the mains water inlet valve, see Fig. 4.4.
2. Open all hot taps to allow as much draining of the boiler as possible.
Note: Some water will remain in the components and care must be taken when removing them.
7.3 IGNITION AND SENSING ELECTRODE - Fig. 6.7
Gain access as described in Section 7.1.
1. Unhook the ignition lead from the rear of the control panel, release the grommet and unplug the lead from the PCB.
2. Remove the two nuts securing the electrode to the front of the combustion chamber using an 8 mm socket and carefully
withdraw the electrode.
3. Fit the new electrode with a new gasket and re-assemble in reverse order.
4. Test the boiler and carry out the full calibration as described in Section 5.13.
7.4 MAIN BURNER
1. Remove the burner as described in Routine Servicing, Section 6.3.
2. Re-assemble with a new burner as described in Routine Servicing, Section 6.5.
3. Test the boiler and carry out the full calibration as described in Section 5.13.
7.5 FAN - Fig. 6.7
Gain access as described in Section 7.1.
1. Remove the gas pipe to air/gas manifold retaining clip and unplug the fan wire from the fan.
2. Remove the fan inlet manifold to burner cover screws and lift the fan assembly upwards to unhook it from the gas pipe.
3. Remove the three venturi screws and transfer the venturi and seal to the new fan.
4. Remove the two fan inlet manifold screws and transfer the manifold and seal to the new fan.
5. Re-assemble in reverse order.
6. Test the boiler as described in Routine Servicing and carry out the fast calibration as described in Section 5.13.
Alpha InTec² 25XE and 28XE - Component Replacement
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