Over the last few days my combi boiler (Ariston Genus 30) has started developing a noise whenever I draw domestic hot water. The noise builds up over about 30 seconds, starting out like the sound of a kettle starting to boil and ending up as a continuous loud low hum - like the sound of an articulated lorry braking heavily.
It doesn't make any unusual noises if we have just the central heating on. So,
Just central heating = quiet.
Just DHW = noisy
DHW + CH = noisy.
A month or so ago I did the following work on my system:
(1) Changed some piping for the bath's hot water. This is a long way from the boiler, and drawing water from any tap makes the noise. So, I believe this to be unrelated.
(2) Drained the CH system to fit a new radiator, and flushed it with desludging solution.
If this is "kettling", what's the best way to solve it?
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