Viessmann Vitodens 200 Combi - screeching and 'F5' cutout

[AL66]

Boiler is in an outside cupboard, flue consists of a 90 degree bend to the left and then straight through the outside wall to the terminal - no more than 2 feet long. when the landlord's heating guy first looked at the problems and spoke to Viessmann technical there was a suggestion that there were now modfied parts available for the flue (boiler was installed May 2005). I can't see any sign of any part of the flue having been replaced during the recent visits - are there modified parts for the flue?

 

[AL66]

Just to add - the flap has been replaced as the old one is still lying around near the boiler and there's been no reoccurance of the 'F5' cutout since it was changed.

 

[AL66]

Any more thoughts on this anyone? Tony?

With luck I'll be getting a visit on Friday from a Viessmann engineer (weather and other calls permitting - apparently it's not highest priority as it works after a fashion!).

Problems:
1. Screaming noise
2. Losing system pressure within a few days

Are these related maybe???

Thanks!

 

[mysteryman]

Did you get this fixed?

 

[pellattuk]

Viessmann do a kit to cure the noise problem. I consists of a tube and springs and slides into the flue outlet.
Apparently after a while the flue starts to resonate but no one can tell me why.

 

[pellattuk]

I have had the same problems.
The F5 fault was resolved by replacing the flap as suggested earlier .
The noisey flue was cured by fitting a flue reduction kit supplied by Viessman.