Many thanks to Bab, Londonboy, & D_Hailsham for your replies.
I did find later a post that seem to give me the information.
It was for a Sangamo F4 to Sunvic.
It read
on the sangamo............sunvic
1 = hot water on.............3
2 = hot water off.............1...
Hi Everyone/Anyone
I wonder does anyone know how I should wire the new backplate - the old old has 8 terminla in total the new one has only N &L + 1 to 4.
thanks