I have looked at some of the threads in here and some come close but just not all the way
I have a landing ceiling light with another switch downstairs. I recently bought a new light from IKEA. I have wired it up and it works. Unfortunatley my bedroom and the box bedroom does not.
Coming out of the ceiling are three grey cables each with a Red, Black and Earth. All three earths are sleeved together. There is also One wire heavily sleeved in Red.
I have two blacks going to neutral One black and the single heavy red going to live and the three reds together
Why are my other two bedroom lights not working?