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Thanks Chris, I guess that it's gone beyond what I can reasonably tackle myself. Time to call in an expert. I really appreciate your timely reply. All the best! Paul

Hi, I have an old hot water radiator system with a seperate circuit for Hot Water Only. With Autumn approaching, I have tried to switch it from HW only to CH but the radiators do not heat up. I have bled the radiators at the top of the house and found no air bubble. (Q: DO I JUST NEED...