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Combi boiler whistling

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Simba-ali34

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Hello,

I have a potterton promax combi boiler which has developed a whistling/kettling sound when turning on the hot tap.

The sound seems to reduce has the tap is slowed. I have also noticed this sound occurs when the boiler is turned off and the tap is running??

I can reduce the noise by opening and closing the cold water inlet on the underside of the boiler.

Any clues? Is this something a gas engineer could solve?
 

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