Hi I am hoping for some help. I am installing hive in my home from my existing Combi boiler. I currently have 2, 3 core Cables going into the switch. On the existing switch the connections are N, L and L1. On the Hive is N, L, Common and Hot water on. I know the N and L but what is L1 and where would each cable go on the New hive switch. Please help