Thanks guys as I am a customer and have no idea. Yes the boiler was installed 8 years ago and has been serviced every year since - the sound is very intermittent and everytime somebody has been out in the past they have not been able to reproduce the problem.
Hi I have had somebody in to look at a relative's GlowWorm boiler which makes an intermittent whistling/howling noise. Its 8 years old and has been serviced every year and apart from this intermittent noise it works fine.
They have had somebody out to them and they have recommended a new...
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