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Thanks Paul, during the stripdown of the diverter valve it looked OK so I'll investigate the ajoining pipework. Is PEDANTICVINDICTIVEMAN typical of the assistance we can expect from the Forum or does he provide the entertainment? StuartS

We have a Baxi 105E Combi boiler - 2 years old. Whenever the heating comes on, after a few minutes it begins to whistle, the noise is coming from the 3 way valve and it stops immediately as soon as you run a hot tap. Another symptom is that when you close the hot tap, there is a creaking noise...