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6 Routine Servicing6.4 Combustion Chamber Cleaninga) If required, clean combustion chamber (A) and heating surfaces within with asoft brush, or flush with water. Important. Scratches on parts which are incontact with flue gases can lead to corrosion. Only use plastic brushes ratherthan wire brushes.b) Replace the burner assembly as a reverse of removal.6.5 Air Pressure Switch Sensing Pipesa) Check that the pressure switch sensing pipes are not blocked or damaged. Itis not necessary to remove the air pressure switch; this is not adjustable anddoes not require any servicing.47
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