Graham, OFTEC engineer in Suffolk here....if it's balanced flue then check the flue terminal. Boulters made a bottom exit flue which sucked back in the gases and upset the combustion process. If your engineer is checking the smoke number with a pump and the CO2 (not CO that's a different issue) with an analysler then he should be able to determine what is going on. Look for 0 smoke, 11.5% CO2 and between 40 - 90 ppm CO pump pressure about 110 and air setting to suit. If it's conventional flue (i.e. chimney) then check it's not blocked! and that the thing still gives the same readings when all the covers are on. Also make sure it can breath properly. i.e NO tumble dryers or extractor fans upsetting/depriving it of it's air supply. Hope this helps.
black smoke boiler problem
- Thread starter grahamhunter
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While thats all good general advice, this fellow has clearly described the installation and the problem.
If you carefully read through the discussions you will see that its fine until Fridays when it belches out the black smoke!
Then you can use your diagnostic skills to advise what the problem may be! I will be interested to know what it turns out to be!
Tony
Don't reckon it is
Why Tony may I remind you that the boiler is fine for 4 Fridays out of 5
What a few of you experts seem to be hedging around is the fact the dam thing worked fine for 8 years.
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Thats not the way I interpret it John!
Fails on Friday and the engineer comes on Monday and it works Ok until the Friday!!!
Maybe I should go up there for a long weekend???
Tony
I was hoping Oil Fired Up would have some new ideas !
I still think that its a two state fault linked to something different that happens on Fridays!
But as yet I dont know what!
A few minutes on the phone to the owner might give me more clues though!
Tony
I still think that its a two state fault linked to something different that happens on Fridays!
But as yet I dont know what!
A few minutes on the phone to the owner might give me more clues though!
Tony
Well I still say its a progressive fault, linked to the combustion.
We have lots of ideas but none of us have been there!
If its progressive then its a five day progression but I would have thought that some dark smoke would have been noticeable on the Thursday.
Tony
...none of us has been there.Agile said:
This is beginning to feel like one of those topics where the OP will come back in 15 months time and report that he bought a new boiler.
Either that or oilman has gone up there to sort it aaaahht.
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He does not need to!
You seem to be creating a considerable amount without assistance!!
Without a site visit this thread is all speculation!!
Please show me where I've proposed more than one theory for the behaviour.Terrywookfit said:
That is untrue. Some of it is deduction, and some of it is requesting more information from the OP - the normal process of fault-finding.
Perhaps you can't deduce anything without a site visit, in which case I don't know why you're even reading this topic, let alone posting on it.
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