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Hi Terry, no magnetic filter I'm afraid. Pipes are copper - no idea on how the radiators are fed, is this something that's easy to discern from looking at the pipework/boiler/radiators themselves? Happy to check if it's straightforward. Appreciate the responses so far.

Hi Terry, thanks for the quick reply. Should have included in the original comment, closing the TRV on all the working radiators doesn't cause either of the cold ones to heat up. I take the point about the blockage being on the return pipe, makes a lot of sense. Is it worth adding a system...

Hi first time post, and appreciate some of the steps below that have already been taken are not standard procedure but I was wondering if anyone here had an interpretation or advice. Have a 3 storey house with a system boiler, 17 radiators in total fed by microbore pipe, with boiler (Ideal H24)...