Adjust, Service, Repair or Replace as necessary
Isolate Mains Power to appliance as per TOPs P4
Isolate Water and Gas as appropriate

Location:
Tests carried out so far have revealed ignition failure is due to gas valve / spark generator failure, both items will require replacement.
Upon completion of the fault diagnostics carry out final electrical safety tests and checks as per TOPs (C6).

Refer to ADAPT for further information.

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or Email - Diaglab@britishgas.co.uk