I,ve just had a new boiler installed and the flue was installed through the loft with 2 X 45 degree bends to get the flue through the roof. the system ran great for a week and then I had to redirect the flue by removing the 45 bends and replacing them with 90 degree bends, since i have done this when we draw off hot water the boiler makes a terrible vibrating and rumbling noise for 2 or 3 seconds but the boiler doesn't trip out. Can someone tell me what the problem is, and should I put the 2 45 bends back.
Thanks for the help, happy new year to you all.
Thanks for the help, happy new year to you all.