Vailliant eco tec heat omnly on a s plan

[king of pipes]

I have a system upgraded in september that has developed a pipework vibration problem its not all the time checked the zone valves seem ok system running at 65 degrees speed 2 on a new Dab evo pump auto bypass fitted , gets quite loud for a short time then quietens down its not a air problem has a nrv on the common return back to the boiler thinking this maybe sticking so gonna have it out and the autobypass , anyone have any theories . cheers kop

 

[ShaunCorbs]

Only when hot water is on ??

 

[Last Plumber]

You've heard it then?

 

[king of pipes]

Can do it anytime bud but did it with heating and hotwater on the first time on sunday when it came on first thing . cheers kop

 

[Last Plumber]

Definitely pipe noise ?
Not that trombone you get from the odd Vaillant?

Have you tried changing pump speed to see if the tone changes?

 

[king of pipes]

Yes last briefly put the pump speed down to 1 that brought it on i thinking there a restriction somewhere starting with the obvious, system is clean was jet flushed mag filter fitted and it is clean grrrr. Kop

 

[Last Plumber]

I think you're on it!


I know you probably thought of this. Have you tried adjusting bypass when it's making noises?

 

[king of pipes]

Yes mate tried that took a little longer than i had expected to open up but no banging ? I will swap it anyway and gonna whip that nrv out aswell. Cheers kop

 

[tolly]

Why does it have NRV on return? Is it part of a cascade?

 

[townfanjon]

Why does it have NRV on return? Is it part of a cascade?

Just what I was thinking , loose it !

 

[king of pipes]

Still happening running out of ideas now zone valve out next

 

[townfanjon]

Still happening running out of ideas now zone valve out next

What type Kopsta

 

[king of pipes]

Honeywell bud theres a restriction somewhere bud just got to find the cause ?

 

[king of pipes]

May even be the mag filter went for a plumbcity instinct one ? Not happening all the time though but customer has shut some rads off and down low on others when trvs close and hot water is satisfied it does vibrate down the return , hallway rad has no trv , Honeywell auto bypass so should handle it tricky one another vist today to try and improve it. Cheers kop.

 

[king of pipes]

Turned out to to be the boiler itself Valliant coming out Tuesday so will keep you posted guys . cheers kop

 

[tolly]

Was it the newer ecotec plus heat only with the alu hex and downward burner?

 

[king of pipes]

No bud ecotec 18kw heat only s/s heat exchanger .

 

[king of pipes]

New heat exchanger fitted today under warranty down rated it to 15kw so hopefully sorted now . cheers kop