It had the same problem about 2.5 years ago - basically the pilot light goes out - re-lights easyily enough - runs for a while - hours to weeks, then goes out again. Eventually gets worse and worse. Got a man in and he changed the thermocouple, but even then it still goes out every now and then - until today when it seems back to hourly...
Any clues of what I can do myself before calling a man in? It looks relatively straightforward from what I can see - I can identify the pilot feed to the manifold, as well as the thermocouple - I'd not hesitate to replace either if they were at fault - but I've no real experience of this sort of fault - what's it likely to be - the pilot itself or the thermocouple - or maybe something else?
The room itself is well ventilated, so I don't think it's lack of oxygen or CO buildup. Pilot light burns with a blue flame (although I think it's a bit "fuzzy", but I don't know if it's meant to be like that!)
Loathe to even think about a new boiler as it's otherwise sound and has a functional (if rather ugly) gas fire attached, and is in a place where running a condensate drain would be virtually impossible (middle of house in an old fireplace!)
Any clues welcome!