In article ,
Pamela wrote:
Why would a heating boiler make frequent kettling noises lasting a week
or two and then they stop completely? Perhaps returning after a couple
of months.

Is scale and gunk accumulating in the heat exchanger and then getting
blown away by the kettling bubbles?

that would bhe my assumption.

Screwfix sell a "noise reducer" potion which works well on my system

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle