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Does this boiler normally light itself?
Do you reset the boiler or press the ignitor yourself?
Ok, manual ignition then.
It could just be dirty electrodes, but it is more important as to whty it keeps going out.
I think if you get it serviced and a new thermocouple fitted then this will cure your problem.
Unless you can strip it and clean it or remove the glass and light it with a taper?
Did you manage to get this sorted?