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Apparently I have a problem with my motor within my Potterton Diverter Valve, in that it is on it's way out, as it's buzzing a lot. Does anyone know how to replace the motor within it? Is it very difficult for someone without any plumbing experience? Thanks

Hi, is it normal for a Potterton Diverter Valve to buzz and feel hot, even when both the hot water and central heating have been switched off for a couple of hours. It seems like it is always on, buzzing. This may be normal, but I didn't think I had ever noticed it before. Is this normal?