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Thanks. I have sorted the problem now. You were right. I had connected the new red wire (from the 3 core & earth) to L1 on the original switch. I have now switched two red wires around so that the new red wire is connected to com on both switches. My mistake, but problem solved. Thanks

I have followed the instructions on this site to install a new two way system which replaces the old one way system in my kitchen. The original swith had Comm, L1 & L2. There was one red wire in Comm and two red wires in L1. I worked on the assumption that the two red wires in L1 had the same...