Noisy pump 10 mins after water has come on

Joined
8 Jul 2009
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Location
Buckinghamshire
Country
United Kingdom
Can anyone advise why our CH pump sounds like a Chieftan tank 10 mins after the boiler comes on. The rest of the time that the Hot Water is on the pump makes no noise. The pump is set on the slowest setting, we daren't turn it up! I've tried turning down the thermostat on the hot water tank and that makes no difference.
 
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have you turned the boiler stat down? maybe the water is not circulating through the boiler fast enough and causing the sounds. try your pump speed up a bit? also, is the pump sounding kind of off balance at all??
 
Thanks for your prompt reply. I've turned the boiler stat down from 3 to 2, and bliss, no more noise.
My only concern is that the problem will resume when I need to turn the boiler stat back up in the winter?
 

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