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2-4 weeks I think it is?

I'll get some x400 tomorrow then and see if it helps !

Thanks for your replies The pump seems ok, all freed up etc, and other rads far away seem to heat up. Can I use X400 to clean it? Or is that no good for microbore pipe?

Hi I have some radiators not heating up properley at all. First time they have been on again since summer, but this problem was here last winter too. We have microbore pipework, and someone suggested I check or clean the manifold. Where is the manifold usually sited and how can I check...