bubbling sounds in our radiators

3 Nov 2005
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United Kingdom
We seem to have a bubbling sound in our central heating radiators. I've tried bleeding the air out of the ones upstairs several times but the air pockets and squelching bubbling sounds still come back. It only happens with the pump on (new Grundfoss fitted last year)
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So is the pump pumping the correct way :oops:

Open vented system? Are the cold feed and vent close to each other and on the suction side of the pump? Is your pump speed too high, try turning it down, then monitor the system as most pump speeds seem to be set at max when in most cases a reduced speed will do. Exceptions do apply :!:

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