Do you have the make and model?
biasi advance plus 25s system boiler
Does it sound like a kettle, or sound like a machine gun?
Strange question I know, but one is water related and the other gas related
Unless you can think of something else it sounds like
not a rapid set of pops more single one then a gap of 30 seconds to a minute before the next. however this only happens every now and again. for instance has run all day today without problem!!
Ok, keep an eye on it and let me know anything you can
For example, is it when the heating is on, or the heating or both?
Is it when the boiler is just starting or when it has been running for a while
Is it coming from the top, the middle or bottom of the boiler?