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It’s a sealed system. In both systems in order to fire boiler HW needs to be switched on which wiser doesn’t seem to do along with heating.

Thanks. Probably should have stated that it’s oil as opposed to gas. Most threads seem to be related to gas. I have the exact same issue on a fully pressurised system in another house which is what is baffling me because it was a straight swap on the standard backplate and theoretically should...

Yep it is. I’ve since found out that there is limited compatibility with gravity systems. :( thanks for your quick replies

Yep the pictures are of the existing programmer. So I’ve basically wired the new wiser backplate exactly as the old one and everything works apart from boiler doesn’t fire for heating unless you manually activate hot water. In the existing system you can only have HW+CH or HW only

Hi Everyone. I’ve searched to no avail for some answers to what should have been a relatively straight forward install. Attempting to install a Drayton wiser 2 channel hub. Problem being when heating is requested the boiler won’t fire (the pump kicks in) unless hot water is also switched on...