Sudden changes in the types of noises being produced by your oil boiler may be a sign of an underlying problem. A build-up of limescale can be a common cause of boiler noises. When limescale deposits build up on the heat exchanger, they become overheated which can result in the production of steam and bubbling, causing a familiar whistling noise, referred to as kettling.
We would recommend contacting your heating engineer if you notice this sudden change in sound with your boiler.
The information provided here is advice only - if you are not happy to check your product, please contact a heating engineer to assist.
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