Russell Baron
Hi Sophie, If the RCD is tripping you will need to turn all the mcbs of and turn them back on one by one to identify which circuit is causing it to trip.Once you have found the individual circuit say, downstairs sockets is tripping. You then need to unplug all items plugged in and put them in one by one to see which appliance is the case. These probs can be very easy or very hard to sort and you need patience to find em sometimes Might be an idea to get an electrician out . He will have equipment to test your circuits and will prob find the cause fairly quickly for you Hope this helps Russ