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I have also shut off all the locksield valves to all working rads, still no joy.

Still the same problem, also done balancing but no joy. Other rads in house including other downstairs one's are still fine. The problem started with one rad and then others went down.

It's a vented system. Would it be best to use the ds40 before doing any flushing to help loosen or soften any blockage? As I said there is sometimes some warmth getting to the rads so I would persume it must be getting some small ammount of flow albeit irregular.

Ok, so to do that do I presume I drain the system and then blow the air through? I have took up the floorboards upstairs and found where the pipes running downstairs connect in. Would I have to remove all the rads that are not working before blowing air down?

Hi I have a problem with 3 cold downstairs rads. Have used Sentinal x800 to no avail. Had the affected rads off and flushed to no avail. Had plumber take a look who says we have problems with the plastic microbore being blocked somewhere on the downstairs return and suggested having it...