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    3WAY VALVE PROBLEM

    Hello all - 1st post for me here goes :? We have a Rayburn oven driven open CH system over 3 storeys. For a couple of years the top 4 rads have been stone cold for ages then all of a sudden hot. Once the bottom 2 storeys rads had been on for say 1 hr, they suddenly went hot. All this week...
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