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mmmm - looks like your theory is one of blockage then? 11.30 in the night is not a good time to try this kind of thing! However, I certainly have drain-off points on at least three rads downstairs. Investigation is called for!

Hi - thanks for your quick reply! TRVs all round the house, with a roomstat in the entrance hall. I have already tried turning off all the upstairs rads to see what would happen - result was an even colder house, with still no action downstairs! The c/h was turned off at the main timer all...

Hi gang I have just put our Vaillant EcoMAX 828 2E C/H system back on, but now find that I have hot rads upstairs and stone cold rads downstairs. I know that at least one of the downstairs rads was suffering from sludge build-up prior to this (cold spot in the middle of the base of the rad...