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I've bled all the rads, the header tank is OK. It's a vented system. It sounds OK at the moment, will wait and see in a few hours. Tnx :)

Hi all, Bit of a weird one.... our Grundfoss 15-50 heating pump has worked fine up until this Christmas. One night I thought I could hear a car engine running, but it was the pump. Sometimes it's quiet, but others it whines and vibrates a bit - like the bearings are worn, also a whistle can...