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Hi, my British gas 330 boiler packed up and I was told it was beyond economical repair. Although insured and serviced every year, my insurance company refused to compensate me to the value of a new boiler, despite selling me their product upon that basis. I was laid off as a result of CV-19 and money is tight, so I sought a used BG 330 that had been refurbished. I was lucky enough to find one, but it wasn't connected to a UP2, but some other controller which I didn't buy, (couldn't afford it) and because my existing UP2 has functioned without any problems. I did try to get a gas engineer to do the job for me, but no one in my locality would fit a refurbished unit for me. Because this is a straight swap, like for like and I am reasonably conversant with wiring diagrams and electrical circuits, I have now installed the boiler myself and wish to wire up the UP2 to the 330 in the correct manner, before calling out a Vaillant engineer, as they are still contracted to maintain and service my boiler, despite the fact that they also wouldn't fit a refurbished unit for me. British gas installed the original 330 boiler and charged me £5500 for the privilege (Yes I know I got ripped off, but my wife insisted on BG at the time, now she wouldn't give them a second look.) Could anyone advise me as to how to wire up the UP2 correctly? The UP2 has five wires, Brown (live) Blue (neutral) and Green/Yellow (earth) alongside a black and a grey wire running from the control box up to the water tank pump ( I assume that this is for the pump) which in turn, returns back down to be connected to the 330 boiler connection box. The connection box has eight poles. Pole (8) = Pump Live. (7) =Pump Neutral. (6) = Earth. (5) = Earth. (4) = Neutral. 3= Frost stat. (2) =Switch Live. (1) = Mains Live. The existing connections to the main circuit board on the 330 has three inputs, one white and two black covered wires. The white covered input lead occupies Pole 1, (Brown live) pole 4 (Blue neutral) and pole 5 (Y/G earth). A black input lead occupies poles 2 (Red wire) and pole 3 (Black wire) The second black covered wire occupies Pole 8 (Brown live) pole 7 (Blue neutral) and pole 6 g/y earth) The 230v mains connection to the UP2 is located adjacent to the boiler. Many thanks Vince.
