CH pump runs 24/7

Had a biggish rennovation project done that involved replacing an old (Potterton Netaheat) boiler with a new Vaillant Ecomax Pro boiler - 2 months ago. Incidentally, I have what I understand to be an open-vented "S" plan system with two motorised valves. I retained the original 2 channel programmer. The plumber (from Eastern Europe and Corgi registered) who installed the boiler (on sub-contract from the builder) never inspired me with much confidence. Maybe it's because of recent stories about one-legged Romanian roofers :-).
Anyway, there's been a series of problems ever since. The boiler is understood to be 100% OK - as confirmed by the Vaillant engineeer who has visied twice.
The symptoms are:-
1. Recently, the circulating pump (adjacent to the HW cylinder) appears to be running continuously - even when the programmmer is not calling for heat. It is set to operate to provide central heating and hot water during two time periods per day. The radiators warm up and cool down exactly in accordance with the programmer schedule. The boiler fires up every 3 or 4 minutes and when the boier display reaches 68 degrees it stops heating. The temperature in the display drops slowly to around 45 and then the burner starts up again. This cycle carries on 24/7 - even when the programmer is not in an active period. Presumably it is trying to heat the HW cylinder as the radiators stay cold when the programmmer is not in an active period. This problem has emerged only recently.
2.If I over-ride the programmer during an active period ie to shut off the heat, then the boiler stops OK but will not restart later on theschedule. It registers an "overheat" situation and has to be reset by taking off two cover plates and pressing the reset button. I believe this is because the pump stops and hence the circulations stops - causing the combustion chamber to trigger an over-heat situation.
Factoids:- After the boiler was first installed, there was no display on the boiler when the programmer was inactive. I complained about this and the builder brought in an electrician who connected a permanent mains supply to give a fulltime display. We thought we were over all the problems the problems then but a few weeks later problem 1. above emerged.
The questions that spring to mind are:-
1. Have I recently developed a a stuck motorised valve? 2. Did the plumber wire up the programmer correctly to the boiler? 3. What can I do to isolate/identify the problem further? 4. Where can I get a competent boiler installer cum plumber in South London that can check this out.
JG
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It sounds as though it's all wired wrong, so get the electrician back to do it right.
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Sounds like you need a competent electrician. Boiler installers freqently are anything but.
--
*'ome is where you 'ang your @ *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

He needs a heating engineer. Electricians know nothing of heating system operation, unless he specialises in heating control wiring and is employed by a heating contractor.
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together this:
<snip some shite>

Why do you bother? Fuck off and die.
--

SJW
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strung

Your ISP may get to know of your insults.
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together this:

Oh no, what will I do.
--

SJW
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strung

You will know when they contact you.
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together this:

Yeah, right.
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SJW
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strung

LOL !!!!
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Which proves beyond any reasonable doubt that you're no heating engineer, given your lack of knowledge of anything electrical.
FWIW, a competent electrician will have no problems with any domestic heating control gear wiring. They are simplicity itself for a competent electrician. Difficult for a 'heating engineer' to understand this, I'll grant you.
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*Many people quit looking for work when they find a job *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:> > > Sounds like you need a competent electrician. Boiler installers

Imbecile you are wrong.

My knowledge of electrical matters is excellent and above excellent.
I have told you before. Don't give advice on topics you know sweet FA about.
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together this:

You are total fuckwit.
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SJW
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wrote:

If a fly by night sparks can't wire up controls for a simple heating system, then he is not a qualified electrician. The electrical supply system for central heating is simplicity itself to a good electrician. It contains a wiring scheme for simple switching systems that any good electrician could work out in his sleep. A good plumber might have some knowledge of how the wiring works, but any good electrician should know exactly how and where things should go without problems.
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Absolutely. Of course all IMMs 'trade' pals use PP drills, so aren't even worthy of the name 'cowboy'.
Still, the more he goes on about it needing a 'specialist' to wire up domestic heating controls, the more it shows he has no practical experience in such things.
--
*I never drink anything stronger than gin before breakfast *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

Our ng fool interjects....

.....and continues....

This is a bit rich coming from incompetent. Here is this Plowman giving advice on CH..read on...
He also attempts to give advice and criticise views on heating, yet he said about his gas boier.......
"Mine managed over 10 years without being touched before it needed a clean. 'Sooting up' once it starts, happens very quickly."
He didn't have his gas boiler serviced for over 10 years, and knows all the answers in this field - he thinks. Only on the Internet you see this.
These people are dangerous, very dangerous.
This what he wears, yes he does...he said...
"Well, I got a rather flash pair of DeWalt boots from TLC, so there.;-)"
Sad isn't it. Big yellow boots. Yes. big yellow boots. Such a saddo.
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No pet - wiring. Something I do understand.
I'll snip the rest to save bandwidth. Perhaps you could do the same - or find something new to say?
--
*I took an IQ test and the results were negative.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:> > > Still, the more he goes on about it needing a 'specialist' to wire up

You don't understand heating at all.
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And just what has 'heating' to do with wiring the controls?
Perhaps you don't understand the difference.
You really need to learn how to do a 'search'.
--
*Reality? Is that where the pizza delivery guy comes from?

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

giving
< snip drivel >
Stick to turning up and down the treble and bass knobs....and wearing DeWalt boots.
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