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Jon, "Reassuring" to know we are not alone with this problem. Our boiler has only suffered with this problem since we removed all the rads for a major house work over a year ago. The radiators were all thoroughly washed out & the heating system had my version of a system flush as I connected...

Mick, Yes, the Fernox F2 was added through a radiator. The heating was used for at least 2 weeks afterwards so the noise silencer fluid must have been well mixed in by the time we last used the system. I am reluctant to use the heating system until it is decided that there is nothing else I...

Mick, No that rad has its valves open all the time. Bob

Thanks to Twogas (Mick) & Agile (Tony) for your quick replies to my query. Mick, all the controls we have are a Drayton MA1 Mid Position Actuator valve, a Drayton HTS3 Tank Stat. a Grundfos Type 15-50 Selectric Pump & a Lifestyle LP522 system programmer. All, bar one radiator, is fitted with a...

We have a 3.5 year old Halstead Eden X Type VBX 30 that works efficiently but it has a loud knocking & vibration period 5 minutes after heating light up. The problem manifests itself for about 5 minutes then all goes relatively silent. It does not happen when hot water only is on. The noise...