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You were completely correct about the earthing wire. The earth wire had been used as live by the boiler installer and had not been indicated. It all works now. Also thanks for info about having to put in the two port valve and the y plan valve - I wasn't aware both had to go in. Will have some...

Hi, Thanks everyone for such a fast response. I have my G3 ticket and I have notified building control. Unvented cylinders are not something I would play around with having seen the video on utube with them looking like rockets! The original system is a Y plan - I will check that the...

I have replaced an vented cylinder with and unvented cylinder and am having difficulty replacing the single cylinder thermostat wiring with a dual thermostat. The original system is a Drayton Bi-Flo Control Packs. The original wiring from the LWC1 wiring centre was: Terminal 14 Common...