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Hi again, I've done a few photographs of the central heating arrangement. All the controls are in a cupboard with the DHW cylinder. I have also done a schematic of the pipework (not the electrics) in the cupboard, which might help as it is more clearly laid out than the photographs. I...

Thanks again Mick. I'll try to do a few pics and try to learn how to post them. It will be a few days before I can do this.

Thanks Mick, I put in a new pump a few years ago, and the pump overrun problem occurred with the previous pump, so I guess it's not the pump 'stat. Damned if I know how to check or adjust or even find the by-pass, because all the pipework is hidden and virtually impossible to get at. I'll...

I have a Potterton Profile 40e boiler in a straightforward fully pumped system with two 2-way diverter valves, one for hot water and one for central heating. There are two problems, both intermittent, though the first happens much more than the second. 1. When the boiler stops or is...