I have a glow worm swift flow 100 boiler which is 8 years old. I recently
moved a radiator after turning it all off and when I switched it back on
there is a noise.. a sort of whirringWhining noise everytime the pump speeds
up. Is this a result of the bearings on the pump being knackered, or is
there some air in the system that i have to bleed out somehow.
The central heating and hot water are working fine, and I have tried
bleeding the radiators which do not see m to have excessive air in them at
all. The pressure remains constant on the dial.
Any clues on how to stop the noise?