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My Vaillant Boiler is sounding a quiet singing note every 15 mins or so!?

My Vaillant Boiler is sounding a quiet singing note every 15 mins or so! We have just moved in with little money for exploritary tests. This thermocompact gas boiler is the wall hung, room sealed, fan assisted type. The model no. is VC GB 142 EH (GC No. 4104409). Is this normal or could there be a problem? Is it likely to be dangerous?

Alison
January 2007
VaillantHeating, Home Heating SystemsVaillant Boiler 15
wouldn't say its dangerous

hi-spec plumbing
January 2007
would say it dangerous. is it working right? what sort of singing note

hi-spec plumbing
January 2007

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