Added extra images that hopefully show how it was set up previously. Note in 'Upstairs_OLD' i took the photo after one of the wires (highlighted in blue circle)had come out. My first mistake was assuming it came from COM with the other red (like downstairs). Upstairs working after putting the red in...
Hello, I'm having a nightmare and can't for the life of me see where i'm going wrong. I took a photo of the switch before but after putting a new one in it keeps tripping upstairs. Hope someone can spot my error. Thanks