noisy hot water only

20 Aug 2007
Reaction score
United Kingdom
Hi I fitted a three port valve to my central heating system some time ago and it all works great. The only problem I have is that when I select hot water only, a lot of noise (gurgling) comes from the system. If I select heating or heating and water together the noise goes away, it's just when I select hot water on it's own. The valve is ok, I removed it and checked it was working ok.

Does anyone have an idea what could be the problem please?

Thank you
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No I don't have a vent valve. On my system the pipe goes up to the loft and vents into the top up tank through an open ended pipe.

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