HI just drained all radiators in house as best i could, added new radiator
in upstairs bathroom where previously no radiator. Refilled system bleeding all rads as they filled up , variable pump working but rads cold downstairs and hot upstairs , tried turning all off but 1 downstairs to push flow through this worked but when opened up all rads, downstairs rads went cold again! Variable set on highest setting , any ideas? :oops: