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Just a final note - I hope it is working now. I tried a new solenoid on the pump, having removed the apparently redundant valve. The result of this was to show that the valve on the pump was jammed open, and presumably the extra valve was to "cure" this. The failure I had was in the second...

Boilerman2, Mandate Thanks for the help. The burner is a Selectos D42/T26. I'm going to get a replacement photocell to see if that doea anything - at least it's a relatively cheap step to take.

Boilerman2 That sounds plausible. Normally when I look the flame is obvious - but I remember looking once a few days ago and thinking that there was not much sign of the flame - although I could hear it of course. Is there a solution? - perhaps reducing the airflow, a new injector, or...

Thankyou for the interest. I think that for the moment I shall have to wait until the problem becomes more reproducible. It is the fact that it runs for an hour or more which makes things difficult to diagnose and at the same time relatively simple to live with. FYI, while the solenoid valve...

I have a very old (40 years?) Worcester Danesmoor 15/20 boiler which has a Selectos burner. The burner was retrofitted with a Danfoss BFP 21L3 pump before my time with it. I have replaced most of the other things over the past few years. What is happening now is that the boiler generally...