how do i fit timer unit to my biasi 24s?

The timer unit with the off/on slider switch on my biasi 24s broke, so I have purchased a new one. I took the old one off so I could take it to the shop with me to ensure I got the right part, but I foolishly didn't make a note of which coloured wire went in to which numbered socket, I merely drew a little diagram of top left, top right, bottom left, bottom right. When I put the wires in my new part in what I believed to be the correct sockets and turned the boiler on, the main fuse tripped. I conclude I put the wires in the wrong way round, but now I haven't a clue where they are meant to go! I have a black, white, brown and blue wire and sockets numbered 1,2,3,4,5. I know there was no wire in socket number 3. Can anyone tell me which coloured wire goes in to which numbered socket??