Upstairs downstairs light switches not working together

[cuttingman]

I have a 1 gang switch upstairs and a 2 gang switch downstairs.

Upstairs I have a white cable red wire in COM, white cable yellow wire in 1 way and white cable blue wire in 2 way. Grey cable red wire in 1 way and grey cable red wire in 2 way.

Downstairs I have white cable red wire in COM A, white cable yellow wire in 1 way A and white cable blue wire in 2 way A. Grey cable red wire in COM B and grey cable red wire in 2 way B.

I want to be able to switch the upstairs lights on/off from the upstairs switch and downstairs switch.

Thanks

 

[EFLImpudence]

All looks as it should be.

What is the problem?

 

[terryplumb]

What currently happens with switching ?

 

[cuttingman]

All looks as it should be.

What is the problem?

The light upstairs needs to be on, to be able to control it from downstairs. If light is off upstairs we can't turn it on downstairs.

 

[EFLImpudence]

Can only suggest to check the connections.

Make sure the copper is not broken inside the coloured insulation.
It will feel floppy at the end if it is.

Or of course, one of the switches is broken.

 

[terryplumb]

Are the switches new ?
Has the problem recently surfaced ?

 

[cuttingman]

Are the switches new ?
Has the problem recently surfaced ?

Switches are not new, this has always been a problem.

 

[terryplumb]

Switches are not new, this has always been a problem.

Always ,since the original wiring was installed ,or always since you moved in to the property ?

 

[cuttingman]

Always ,since the original wiring was installed ,or always since you moved in to the property ?

Since moved in.

 

[EFLImpudence]

Swap the Blue and Yellow in upstairs switch.

Then if light upstairs needs to be OFF, to be able to control it from downstairs, the upstairs switch is broken or one of the two wires is.

 

[securespark]

Also, are all terminals tight?