Have moved into a house that was built in the 1970's, decorated and needed to replace the 2G2W switches in the hall and landing.
There are 2 three switches - one at the door (1G1W) for the hall light, one at bottom of stairs for hall and landing and one upstairs for landing and bathroom.
All have three wires (red, blue and yellow). I have tried connecting them back up (the old switches were different at the back) with varying degrees of success.
I thought it was basically suposed to be yellow to common, blue to L1 and red L2 (?) but this gives a avriety of results (eg, hall light will only work if one of switches is in on position).
Any help / ideas please?