I need to replace my 2way light switch?

all my wires are red 4 in total

kendo
November 2010

With the power turned off at the consumer unit take the screws out of the other switch that controls the same lights - there should be a red, yellow and blue wire. Take note of which terminals they go in and replicate that at the switch you're replacing, but without the red and black wires.

The red and black wires you have at the new switch go into COM and L1.

So you should have something like:
COM - Black
L1 - Red
L2 - nothing

then on the other side:
COM - Yellow
L1 - Red
L2 - Blue (these 3 might be in a different order).

Adam
February 2009