Technical data

INSTALLATION & SERVICING INSTRUCTIONS
Page 22
9.2 Replacement of Parts (see Figure 13)
Please quote Boiler Serial No. when ordering spare parts.
WARNING: ALWAYS TURN OFF THE GAS SUPPLY AT THE INLET SERVICE COCK, AND
SWITCH OFF AND DISCONNECT THE ELECTRICITY SUPPLY, BEFORE WORKING ON THE
APPLIANCE.
It will be necessary to remove the outer casing (see
Section 9.1.1) before replacing any of the
following parts. After servicing, always check for gas soundness and for functional operation.
9.2.1 Replacement of Main Injector
a Remove main burner (see
Sections 9.1.2 and 9.1.3).
b Unscrew main injector from the manifold at the rear of the boiler.
c Reassemble in reverse order. When replacing, use a little gas jointing compound on the injector
threads to ensure gas soundness (see
Section 9.1.8).
9.2.2 Replacement of Thermocouple
a Remove combustion chamber door (see
Section 9.1.2).
b Unscrew the thermocouple nut at the base of the pilot assembly, releasing the thermocouple.
c Remove the two sealing plate screws, then remove the sealing plates and gasket from the front of
the base of the boiler.
d Remove the electrode lead from the electrode, and withdraw through the hole in the base of the
boiler.
e Unscrew the thermocouple connection at the interrupter at the side of the gas control valve, and
remove the thermocouple.
f Reassemble in reverse order, bending the new thermocouple to match the discarded one. No bend
should be less than 12mm (1/2in) internal radius. Check that the interrupter is held in position by the
thermocouple, but do not overtighten this connection.
9.2.3 Replacement of Electrode
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