Re: creda s150e
its a disconnect and try job
as deltra said
disconnect all elements
make sure all wires are clear
turn on see if it trips
if not reconnect each element in turn till it trips
dont forget the houhold trip goes out at 30ma but that not on the appliance you are on it is a cumulative figure for the whole house
so if the rest of the house is leaking 20ma you only need 10ma to trip and that 23K to earth. also if you are using a 9v meter it may not show up at all
hope this helps
Dave