Vaillant Boiler making loud humming noise when hot water turned on

Unluckyjim · 2026-02-19T16:34:53+0000

Hi all - new to this forum so hopefully following correct protcol. Vaillant ecoTec pro installed about 10 years ago. Started making loud humming high pitched noise when turning on the hot tap. please listen to the video in the mp4 contained in the zip file. Any ideas on the problem and what the fix might be ? Cheers in anticipation.

CountryFan · 2026-02-19T20:34:29+0000

Can’t open the file. Best guess is DIverter valve, failed tap cartridge elsewhere or pump failure.

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Vaillant Boiler making loud humming noise when hot water turned on

Unluckyjim

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