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I'll try that thanks. Definitely not something rattling on the casing, I've checked all that out. Its definitely an "internal" noise.

Anyone care to take a stab at what the sound is?

Thanks for the reply mate. To my ears it actually sounds like an old Geiger counter off the telly. I did drain down the system as part of the DS40 treatment and flushed it through until it ran clear. When draining some off it's a greeny yellow colour and is foamy on top. I should mention...

Hi everyone. I'm a long time lurker, first timer poster. In our house we have a Linea 726 combi boiler. Its 6 years old. Over the last year it has become noisy and I've had an engineer service it in the last couple of months. Initially having read various things about kettling I had...