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He was the most expensive installer and was recommended. The job cost just under £2,500. As a customer I think it unreasonable to expect me to advise my installer that I needed a power flush. Isn't that his job as an approved installer? He advised me on what boiler to buy, why not correctly...

None of the 3 installers that quoted said we needed a power flush. The installer we chose did a chemical flush which was clearly inadequate hence we paid for a further power flush once Vaillant recommended it. We invited the installer to help us when the noise started. He declined and asked us...

The systems was power flushed, the water tested and the heat exchange subsequently replaced. It had no impact on the issue. Thanks for sharing your thoughts.

After 15 call outs, a power flush, multiple attempts to set the ratios, and the replacement of all parts inside the boiler cover the noise continued. The area manager visited. Having witnessed the noise, and still unable to diagnose it he and the senior engineer decided to replace the boiler...

Engineer came yesterday. Turned the pump over but it stuck again. Also said the diverted valve wasn't right either. It has been overheating. Having taken the cover off to look at the exchange there was a small amount of rusty water in a lipped area. Hole in hex or a bit of condensation unknown...

Now have noise again, not as loud. Vaillant called and coming again tomorrow. I went and listened to my mates Vaillant tonight. It is practically silent. I'm so fed up. Why can't mine behave. Can I ask for it to be taken away completely and get a refund? Apparently there is a worcester bosh...

Sorry, it is a combi. Has now died completely. Only 11 days till the service contract is out of it's 28 day preconditions clause.....

Why do these boilers start out ok and then develop howling? What is changing in the boiler?

I have and Ecotec 415, is this well know as detailed above please? I have had power flush, new hx and burner. Still have noise. Please advise any actions I can take to ascertain if it is air intake or flueing.

Hi Tony, Well, it's not conclusive that it was the ratio. Previous changes to the ratio had reduced the noise, but only for a matter of hours, i suspect until the boiler had cooled. As the engineer replaced the parts today, after resetting the ratio yesterday it is possible that the change...

Hello, out of resepect for all the kind people that have helped me on this thread I felt it only right to report the latest. 1. We took a rad outside and flushed it with a hose. Lots of black stuff came out. We decided to have a power flush. 2. Rads got much hotter but boiler noise remained...

It's not a combi. Have a water cylinder with immersion.

It's not a combi. Have a water cylinder with immersion.

Yes, room stat. When I use hot water the "c" on the display goes off while "d" is displayed. Then when water off "c" comes back, "d" goes.

No

Apologies, not new. Was replaced when I had my cylinder moved into loft and heating system pressurised prior to new boiler. So approx 2 years old.

Because the ratio is outside the parameters set in the manual n previous engineers wouldn't do that. So I was concerned.

We have tried the gas ratio a 8.2 but got high pitch annoying constant whining noise. We still have slight continuous whine and howl on start up at the lower ratio. I challenged the engineer about setting it so low at he reassured me it was ok to do this.

I made a mistake when I said the rads were cold at the bottom. If I turn the room thermostat up 5 degrees they get hot all over. Does that mean they are sludge free ish or does sludge also get hot? Sorry if this is a stupid question. Could a rusting radiator be the source of the rust in the...

Thanks for the laugh, I need it, boiler noise driving me mental. Still need to know what is making my water this colour. Power flush could well be pointless if this colour comes back. Is buying new rads a solution?