To (maybe) add to your distress...
A 10 year old boiler never serviced almost certainly will need a new fan before very long.
But I tend to agree with the consensus: if the whole setup, including the boiler, has been reliable until very recently AND the TOTAL bill for parts (HX, conversion kit, fan, ...) plus labour is reasonable, it's worth patching up the old boiler (and then reminding yourself annually that servicing is a Good Idea). Then, at least with a good engineer, you'll get a warning as soon as the sell-by date is reached and you have to pay out for a new boiler AND the other stuff already mentioned above.
A 10 year old boiler never serviced almost certainly will need a new fan before very long.
But I tend to agree with the consensus: if the whole setup, including the boiler, has been reliable until very recently AND the TOTAL bill for parts (HX, conversion kit, fan, ...) plus labour is reasonable, it's worth patching up the old boiler (and then reminding yourself annually that servicing is a Good Idea). Then, at least with a good engineer, you'll get a warning as soon as the sell-by date is reached and you have to pay out for a new boiler AND the other stuff already mentioned above.
