Rattling Unvented Central Heating Valve help

17 Oct 2016
Reaction score
United Kingdom
Hello all - A loud rattling/buzzing sound has developed in the pipes next to our hot water/central heating cylinder.

The sound is locating near to the lower Honeywell valve in the attached picture. Interestingly the sound stops when I turn on the hot water alongside the central heating. Hot water request on its own does not cause the loud rattling/buzzing.

Any help on diagnosis for this (and I guess there could be many possible causes) would be great and give me an idea of whether I can do something with the system to fix this or its a job for the plumber.

The system is unvented and we have Worcester/Bosh boiler and the Ariston Tank pictured. It was put in about 5 years ago.

Any help or advice gratefully received.
Lower valve.jpg
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