It hasn't made any difference to the ch, rads are still cold exc that one closest to cylinder which feels a little warmish. ive ordered a new 3 port switch for tomorrow. Will see if it works. Thank you for your help, it's much appreciated
Hi the boiler won't fire with just ch on, it states s30 on display, only fires when HW is on. Do you want me to put on both ch and hw? The red valve in pic is I think is a pressure release valve, It has a + and - and says screw to adjust? Or do u mean the dial on the cylinder?
No rads don't get hot at all apart from when I run ch only on d70 =2 and then the only rad that gets warm is the closest one to cylinder. That reading is when not firing btw. Do you want again when firing?