It could be the Air pressure Switch or Venturi, or if the sequence is going further before failing, gas control valve , ignition electrode HT Lead, or PCB
as you will see I have named just about every part on the Boiler.
You should call a Registered Gas Engineer who will carry out an intelligent diagnosis of the fault and change the component that is causing the fault
www.gassaferegister.co.uk will assist finding a suitable engineer near you
www.elanar.co.uk
September 2009
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