Help needed wiring mechanical timer switch

[Whin]

Hello all, you helped a lot last time.

I am trying to replace a light switch with a mechanical timer: Greenbrook Mechanical Timer 230V - https://www.screwfix.com/p/greenbrook-mechanical-timer-230v/4883r

The current setup with the switch plate removed looks like this:



Above this switch is another that controls an immersion heater.

I tried connecting the live wires to '3' and '4' as instructed and it works apart from when it's meant to be off the connect lightbulb is pulsing on and off.

Here is the timer:

any ideas on how to have it work correctly? i.e. not be flickering when meant to be off. - I have tried switching around the live wires.

Thank you

 

[Whin]

Sorry the image isn't meant to be up top but it won't let me edit it now

 

[westward10]

How many blues are in the block connector.

 

[Richard Burns]

Without being able to test the cables I would suspect that if you wired it like this

then it should work OK, unless you are overloading the timer switch.
The switch can cope with non motor type loads of up to 16A, so it should be OK on a light.

 

[pirate]

I don't care if it works that way or not (well, of course I do really!) but I just love the way you did that Richard Burns! Excellent graphics and pic editing. It may be easy for you, but I love it! Me, I would've scribbled it on the plasterboard with a pencil and taken a pic...
High tech, that's me!

 

[Richard Burns]

Nah, its rubbish, I should have got the pictures properly matched in size and not reversed the switch picture and drawn in the cables into the connectors, but thank you anyway.
I like the visualisation of scribbling it on plasterboard for a forum post, but it is far too complicated to take a picture!

 

[pirate]

...maybe a bit too much exposed copper on that neutral? Lol!

 

[Richard Burns]

...maybe a bit too much exposed copper on that neutral? Lol!

Yeah you are right!
Sorted

 

[pirate]

Now you're just showing off!

 

[pirate]

Actually keen now to find out if it works...
OP?

 

[Whin]

Yeah you are right!
Sorted
View attachment 41493

wow, thanks. I did the browns but not the blue. I don't have any excess. I'll buy some and try it out.