Noisy Vaillant Ecotec boiler

Vaillant Ecotec boiler. Installed december 2008, under 1 year old.
My plumber has been out a few times, Vaillant have sent their engineer out once, coming back next week again. Problem is intermittant, sounds like comiong from inside boiler, more like a rattle. I did think it was air kettling inside the boiler, both my plumber & Vaillant engineer said this isnt the case. The noise used to be much more of a howl, but the Vaillant engineer turned the gas flow down a lot on his last visit, so now takes much longer to heat up, and howl has turned into a knocking. Will post up again if i ever find out the cause
Vaillant engineer been out, reckoned noise was kettling, either air or debris in heat exchanger. Said its not a boiler problem as such, therefore nothing will be done under warranty. Did turn thermostat down to 65, and that has cured it as not runni ng up to full temp.
Had it serviced today (dec 2009), my plumber agress its probably debris in the heat exchanger. We are going to clean and totally flush system, if that doesnt cure it i will get Vaillant back again to (hopefully) clean or replace heat exchanger)

Category:

Education

Tags:

• Vaillant
• Ecotec
• Noisy
• boiler
• knocking
• rattling
• howling

[steveburrowscbr]

It was fixed by the valiant engineer who turned down the gas supply, and reduced the temperature to about 65 degrees. I'm glad its not now noisy, but for the boiler to run efficiently, it is designed to run fully hot, which it now isnt.

I never found out what caused the problem, I believe a blockage somewhere in the system, thats why they recommend a system flush before fitting a new boiler

[steveburrowscbr]

Filled system with sentinel x400 system restorer last week, left it circulating round system for a week, totally drained and flushed system myself today, and filled with sentinel x100 inhibiter. Noise has totally stopped, boiler is back to how it should be.

I guess it was due to a blockage in the heat exchanger, and the sentinel x400 system restorer did what it was supposed to

[123dfire]

main heat exchanger is blocked with system debris requires flushing and new heat exchanger it is not the fan at all!! the heat exchanger gets coated in debris and causes noise like putting a bit of tomatoe sauce in a pan and putting the hob on full burn it cakes the sauce to the pan same thing happens with debris causing micro pockets of boiling water in heat exchanger thats what makes the noise..... ( vaillant engineer)...

[steveburrowscbr]

@123dfire I dont see why my engineer (the one who fitted it), or 2 Vaillant engineers didnt pick it up (i suppose it is a hassly job to fix though). The engineers just down down the heat output

[odserv]

To prove that its the fan making the noise when its on full power. Turn the boiler max heat output down to 50% and it will stop happening(or get vaillant engineer to do it). But don't accept that as a fix. It needs the fan replacing.

[steveburrowscbr]

@odserv The last Vaillant engineer did turn the heat output down. In stead of heating up to 72 degrees from cold in about 2 minutes, it now takes longer than 5 minutes. That sort of cured it for a bit, but it came back, and the only way i can stop it is setting the boiler thermostat to 65 degrees

[m1ckyg69]

New heat exchanger for you!

[dogrob1973]

I have seen this problem before and after several calls to vaillants technical line I spoke to someone that knew there stuff. It was down to the air intake pipe inside the boiler and drilling a 6mm hole in the top of it solves the fault!! It's a design fault but he said it very rarely happens? They have changed the design now.

[addict1954]

mine also purs its the diverter valve bouncing on mine . i think

[redpola]

What was the conclusion on this? My boiler is doing exactly the same- a loud "grinding" noise that shakes through the whole house. My solution is to turn heat/hw down to 50 degrees.

[yeeyeeyeeyee1]

that is the diverter valve bouncing

[tota0523]

Sranje od bojlera vjeruj mi!!!!

[dogrob1973]

And it's more than definitely not the fan, I changed one on the boiler before with this fault and it did the same thing, it's just the black air intake tube.

[k956upg]

without reading any comments ill say fan

its too fast for anything else

just a hose or wire catching the blade i suspect.

off balance blades are more mechanical sounding.

[mielefan18]

Press the - button under the LCD - display. it will show you the pressure in the heating system. if it´s under 0,6 bars, there will be not enough water for circulation in the radiatior und will maybe also explain why the temp. is so high