24 Dec - update - Grundfos pump still runs constantly

[Hot&Cold]

most gas boiler repair companies expect the system to be installed correctly,thats why they send part changers

 

[Littlemiss21]

Surprised BG havent pulled out the third party interference card yet!

I should think that there is a issue within the wiring centre thats occured at some point during all these valve changes. Its really not a massive job to rewire the airing cupboard.

I fully agree with you re: wiring centre If I knew what I was doing with a multi meter I’d have a prod around myself.

 

[dilalio]

To be fair. Every now and then along comes a problem that stymies everyone... Especially with electrics and its just far easier to take it all out and start again.

 

[petit_pablo]

most gas boiler repair companies expect the system to be installed correctly,thats why they send part changers

And some people just like to have a dig on the internet

 

[Littlemiss21]

To be fair. Every now and then along comes a problem that stymies everyone... Especially with electrics and its just far easier to take it all out and start again.

Thank you Dilalio. I’m stumped - as even Vaillant, the boiler manufacturer has confirmed that the installation is fine. I will post the full details of the fault when it’s found!

 

[ianmcd]

So many have given you the correct answer, it is not wired correctly

 

[dilalio]

I fully agree with you re: wiring centre If I knew what I was doing with a multi meter I’d have a prod around myself.

Judging by the correct terminology you've been using, it sounds like you're almost qualified to do so after all this

 

[Littlemiss21]

So many have given you the correct answer, it is not wired correctly

AGREE!!!!!!

 

[ianmcd]

Thank you Dilalio. I’m stumped - as even Vaillant, the boiler manufacturer has confirmed that the installation is fine. I will post the full details of the fault when it’s found!

I think you mis understood the Vaillant engineer, what he said was the boiler is fine, he would not look at anything outside the boiler its not why he is there

 

[Littlemiss21]

Judging by the correct terminology you've been using, it sounds like you're almost qualified to do so after all this

Hahahaha!!! I’ve learnt all this from google and replies from you good folk on here!

 

[ReganAndCarter]

it has been installed as a 230v 3 wire installation, without pump overun. The old boiler was merely taken off the wall and the new one put up - using the same existing cable

Don't want to disturb this fascinating thread or send it off on another tangent. And I realise that this is nothing to do with the OP's problem, but is the boiler correctly installed without having pump overrun? I thought it was needed on modern boilers to protect main hex?

Am prepared to be corrected.

 

[Littlemiss21]

I think you mis understood the Vaillant engineer, what he said was the boiler is fine, he would not look at anything outside the boiler its not why he is there

Yes - apologies i didn’t explain it properly. Vaillant engineer checked how the boiler has been wired up (wires inside the boiler near the pcb). You are correct - he did not check the wiring in the junction box/valves etc.

 

[dilalio]

I think you mis understood the Vaillant engineer, what he said was the boiler is fine, he would not look at anything outside the boiler its not why he is there

Exactly! Vaillant would have been called out, under warranty, on the basis that fault was suspected inside the boiler. This not being the case... they likely charged BG for the callout.

 

[Littlemiss21]

Don't want to disturb this fascinating thread or send it off on another tangent. And I realise that this is nothing to do with the OP's problem, but is the boiler correctly installed without having pump overrun? I thought it was needed on modern boilers to protect main hex?

Am prepared to be corrected.

Hi. I’ll post a pic from the Vaillant installation booklet (the Vaillant engineer pointed this out to me and confirmed this is how the boiler has been installed.
I just can’t wait for this nightmare to be solved...

 

[MeldrewsMate]

Vaillant have been out and checked the boiler. - they have confirmed that all is fine with the boiler and the wiring. it has been installed as a 230v 3 wire installation, without pump overun.

Does a three wire installation mean that all power is removed from the boiler when the SL goes low? ie the wires are Earth, Neutral, and a switched live? If so, are you saying that the boiler manufacturer has approved this method?

Once this saga is over, I will have the pump run permanent live connection installed - but just darent at this stage with the major issue we are already having.

So there is a pump overrun feed from the boiler, and it's not being used? And the boiler manufacturer is happy with this?

MM