vaillant boiler help needed

hi all ,in need of a bit of help for a sick vaillant 828 turbo plus fitted about 3 years ago,a brief history>>>boiler fitted but system was
not flushed first(i know) hence never worked properly from word go had vaillant engineer down diagnosed secondary heat exchanger blocked (full
of black bits)cleaned it got boiler working and recomended a power flush.system power flushed(plenty of black dirty water)boiler sort of working better but gradually got worse so brought new heat exchanger and still the same next fitted diverter valve still no joy whats always
happened is the boiler takes ages to cut in when there is a demand for
hot water, heating works fine, sometimes hot water demand works fine sometimes 20 mins or so for it to cut in if any one can steer me in the right direction it would be much appreceated.
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Did anyone put any additive in the boiler water when the heater was new?

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snipped-for-privacy@btinternet.com wrote:

<SNIP>
Steering to this group: UK.D-I-Y
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Vaillant was sold in the U.S. I work on a couple of them.
wrote:

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We oput in quite a few of the oil-fired units over the years. We don't any more because we couldn't get them. Not sure if the US distributor satopped carrying them or just our local one.
Pretty nice units. Easy to work on and have never really had much trouble with them...
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On 27 Jan 2006 09:54:37 -0800, snipped-for-privacy@btinternet.com wrote:

Why do you write without capitals or punctuation? I can't understand your post. Did you go to school?
Remove NOPSAM to email me. Please let me know if you have posted also.
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He probably went to a school where they didn't have English or typing courses.
wrote:

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