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Yes paid him already. He came back when I mentioned the issue but stated he has wired it correctly so no refund due. He is saying there is problem with boiler. I have a multimeter if that is what you're referring to?

As far as I can tell. The old thermostat was basically disconnected. The new 5 core wire was fed into the boiler terminal block. There is a motorised valve (wires coming out of black coloured core) which activate a switch that then switches on CH. Interestingly the motor still works and switch...

Hello all, I have been following the forum and tried searching various threads on Hive installation with Potterton Promax HE Store (Baxi) combi boiler but seems like I was getting even more confused due to some wiring arrangements. Decided to get a plumber to fit mine for me and low and behold...