In message , Smithtv
writes
Hi

I`ve got one of these boilers about the same age and if I remember correctly, I
think I had a similar problem around 10 years ago.

The fault was due to the flue extractor fan micro-switch failing meaning that
the boiler didn`t recognise that the fan was drawing out the exhaust fumes and
so it switched off.

Ah, but unless the air pressure switch is working properly, the pilot
and spark won't be energised, so that can't be the case here

--
geoff