.....Heatline c24.....

[Harvest Fields]

sounds like air getting into the burners like when you purge is the some splits in the burner

Cannot see anything and it only does it on hot water.

 

[Gasmk1]

Cannot see anything and it only does it on hot water.

thats when its at its highest setting so may be worth checking the burner

 

[dancinplumba]

plates in plate heat ex

 

[Harvest Fields]

thats when its at its highest setting so may be worth checking the burner

I will have a look when I go back as it is leaking as well.

 

[Harvest Fields]

plates in plate heat ex

That’s where I was heading. But wanted other views/ideas.

 

[elbistan]

I have come accross to similar noises on Baxi Solo twice and it was the gas valve.