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Our new Vaillant boiler whines/whistles very loudly when switched on ?

Our new Vaillant boiler whines /whistles very loudly when it is first switched on for about 5 minutes. Is this normal ? It has been installed for two weeks. The model is VUecoTECplus418.

R.Baken
January 2010
VaillantHeating, Home Heating SystemsSwitched Normal Installed
not normal, sounds like a problem with the flue / air intake system. get your installer back.

Ian
January 2010

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