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18. COMPONENT REPLACEMENT AND PERIODIC CLEANING
It is the law that any service work must be carried out by a competent person.
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 leaks after replacing any gas carrying components or disturbing any gas connections.
Check the operation of the boiler. (see section 16: "BOILER OPERATION"). Ensure that all the controls are returned to
their original settings.
CLEANING THE BOILER
• Remove any deposits from heat exchanger using a suitable soft brush. Do not use a brush with metallic bristles.
• Check the condition of the combustion chamber insulation panels. Any damaged panels must be replaced.
• Check the condition of the burner injector on the manifold, carefully clean it with a soft brush if necessary. Do not use a brush
with metallic bristles as this might damage the injector.
• Remove any fallen deposits from the bottom of the inner case.
• Clean the burner with a soft brush and check that the flame ports are clear. Blockages may be removed with a stiffer brush.
• Check the condition of the electrodes.
• Check the spark gap, positioning and height of the electrodes.
• Check that the fan impeller is clean and free to rotate.
18.1 DRAINING THE BOILER
Isolate the electricity supply and close the boiler gas service cock (see section 3: "GENERAL BOILER INFORMATION"). Allow
the boiler to cool.
• Heating circuit
Close the central heating flow and return valves (see section 3: "GENERAL BOILER INFORMATION").
Connect a suitable pipe to the drain point and route it to a suitable container. Open the drain tap.
• Hot water circuit
Close the cold water inlet valve (see section 3: "GENERAL BOILER INFORMATION"). Open any hot tap below the level of the
boiler to allow as much draining as possible.
Note:
Some water will remain in the components and care must be taken when removing them.
18.2 ELECTRODES
CG_2190
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7703472.01 (1-03/18)
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