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I cunningly fitted the world's most comprehensive draining points in the system, so draining is a piece of the proverbial. And with auto vents all over the shop, bleeding is bleeding easy. I'll drain and run it for a week or so on l'eau frais, redrain and add F1. That did not make noise...

Interesting you mention frothing. I checked the two boiler bleed points earlier - just in case - the warm (not over hot) water in the pump and the nipple at the top of the H/E was distinctly aerated..... and "fizzy" after being run at high power some minutes earlier. Sounds like a full...

Oh pooh! It was a Litre of Purimachos Protex.... which I bought on "sale" from Screwfix before they dropped the brand.... Unbelievable (or not) that a Litre of inhibitor in a 15 rad system might cause noise.... The only reason I added it was that I had added the 15th rad to a new room a...

Thanks for the reply. I will try and clarify! The supply pressure is 19mB at the boiler inlet test point. If the gas fire or stove is lit, this drops more. The lowest seen is 17mB, which is the bottom of the allowed range in the Biasi spec. The gas supply does seem to vary off load between 24...

I have exactly the same problem, same boiler. Range rated down to 21kW on CH, so no foghorn sound. Once the DHW flow causes the boiler to modulate up, the bellowing begins. Biasi immediately said "if it sounds like a foghorn, the CO2 is not set correctly". OK - it WAS set when it was fitted in...