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I haven't tried balancing but only because nothing has been altered since the last plumber fitted the new pump. No there doesn't appear to be a pattern except that in the morning, everything seems fine but as soon as the radiators cool down, they never heat up again!

This is an odd one. For a few days noticed downstairs radiators not getting hot from late morning onwards although upstairs ones seem fine. Pump is less than 12 months old, divertor valve about 18 months old. Can hear and feel the pump working and have checked the spindle which is...