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8 Fault FindingIt is the law that any service work must be carried out by a competent person such as a Britishgas engineer or other CORGI registered personnel8.1 GeneralBefore looking for a fault condition, check that:a) The mains electrical supply is turned on.b) The clock and / or room thermostat (if fitted) are calling for heat (CH ‘faults’ only)c) The gas service cock is open.d) The DHW (Combi only) and CH isolation cocks are open.e) The system is at design pressure.Before attempting any electrical fault finding, always conduct the preliminary electrical systemchecks as described in the Instructions for the British Gas Multimeter or other similarinstrument.On completion of any service or fault finding operation involving making or breaking electricalconnections always check for EARTH CONTINUITY, POLARITY and RESISTANCE TO EARTH.Detailed procedures for replacing faulty components are described in section 9.8.2 Built in Diagnostic FeaturesFeatures are as follows:Troubleshooting stepsDiagnosisEstablish error message or determine behaviour of system.Look for the corresponding cause of the fault in the diagnostic table.CorrectionEstablish the action required in the table.Correct the fault.51
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