Hi, I have just moved house and have a Potterton Suprima heat only boiler.
The boiler works but makes an awful noise as though an aircraft is taking off.
I have bled the system which help reduce the noise slightly but still the whirrling laboured noise still persits.
Hope you can help

Dave.

Dave Saunders, January 2010

only know 2 things that spin fast in a boiler.
1) the fan
2) the water pump
the bearings could be failing in either one.
if you can locate the pump and increase its speed does the whirling noise increase

wirecutterman, January 2010