Hi
Just completely fitted out my central heating system with a Worcester bosh 30CDI and I've notice that after 30min of the central heating being ON, the pump sounds noisy, like its got sand in it! Its a grundfos 15-60 which I bought new. It is silent when it begins, which I've tested on all three speed settings. Once it becomes noisy it can be reduced by switching it to speed setting 2. Has anyone ever encoutered this?
Thanks
Rob
Just completely fitted out my central heating system with a Worcester bosh 30CDI and I've notice that after 30min of the central heating being ON, the pump sounds noisy, like its got sand in it! Its a grundfos 15-60 which I bought new. It is silent when it begins, which I've tested on all three speed settings. Once it becomes noisy it can be reduced by switching it to speed setting 2. Has anyone ever encoutered this?
Thanks
Rob