With reference to my recent post regarding this problem I would just like to say Thanks for your help Especially Boilerman2.
IT WAS THE ACCESS DOOR SEAL causing recycling of the flue gasses!
I didnt actually check this as the previously so called competant company who carried out the last service should not have replaced this cover with half of the gasket missing. lesson learned, trust nobody.
This seal is no longer available so resealed with rope seal and high temperature silicone.
Carried out another combustion test today and all is ok.
thank you once again.
Steve
IT WAS THE ACCESS DOOR SEAL causing recycling of the flue gasses!
I didnt actually check this as the previously so called competant company who carried out the last service should not have replaced this cover with half of the gasket missing. lesson learned, trust nobody.
This seal is no longer available so resealed with rope seal and high temperature silicone.
Carried out another combustion test today and all is ok.
thank you once again.
Steve