Smell of fumes from oil boiler that's just been serviced

[Rollerball]

Before the service - no smell.

Immediately after the service - no smell.

About 4 hours after the service - smell of fumes in the boiler room (either exhaust or kerosene, hard to be certain).

Have checked everything very carefully, no sign of a leak.

A thorough service was carried out, the burner nozzle was also replaced.

I've noticed in the past that there's more of a smell immediately after a service but that always dissipates after a few hours. This is different in the sense that there was no smell at first, it only started a few hours later.

The boiler is a Danesmoor 15 19

Any ideas please?

(I'll call the engineer tomorrow if it continues).

 

[oilboffin]

Get him back and check for a leak on the pump.Bob

 

[Rollerball]

Thanks. Strangely enough the smell is easing now (the boiler is still on). Maybe something burning off as a result of the service?