I have recently had a new consumer unit (full RCBO) and now my upstairs lights circuit will not function. Previously the consumer unit was a 10 way and 5 of the ways were RCD protected and the other side wasn't. The side that wasn't protected had the upstairs lights
All of the lights on the circuit have a shelly switch but two lights also have a 2 way switch as well
Landing Light - Typical upstairs and downstairs
Loft Light - One switch on the landing one up in the loft
This is how they are wired and it was all ok until the new RCBO which basically either instantly trips or it trips when you turn on one of the two way switches
This should be right from everything I have read and understand, can anyone help?