Even your drawing shows that you have no neutral at the switch. Your drawing actually shows where the neutral is. (It is the black one at the ceiling rose)
You could save yourself a lot of grief by putting the old switch back and buying a Philips HUE lamp. (You can control it from your phone, and if you have an Amazon echo, you can tell it to turn the light on or off or to dim it. )
If I have no neutral how is power flowing through the blue cable?
If I follow the black cable the power goes through the light, out the brown, connects to the red, goes to the old switch which sends the power down the blue and the red at the same time. The black circle in the middle isn't a switch anymore, I'm using the metal connectors in it to hold the wires together.
L1 and N are connected to the same wire and both provide power to the device as my light is constantly on.
I'd rather figure out what's wrong and resolve it than purchase another item as a quick fix.
There is no neutral at the switch. Your own drawing shows where the neutral is.
As you said
TheVoid wrote:I've either completely misunderstood how the neutral works
When most 2 way switching systems are installed, a "twin and earth" is run from the ceiling rose to the first switch. From the first switch to the second switch a 3 core and earth is run. (The 3 core and earth used to be coloured as you have, red, yellow and blue)
So unless you can get the other end of the cable (with Red, Blue and Yellow) up to the ceiling rose, your switch will never work.
If it is of any consolation, a lot of people buy "smart switches" and find out (as you have done) that at most switches there is no neutral.
Just trying to find a way to light it up so I can get a clear picture but maybe this diagram will help as it's clearer than the photos I'm taking
So the black wire is the neutral coming from the power source and the red wire is the live, should there be a 3rd wire coming from the power source for this to work our can you split the neutral at the ceiling rose?
When this is setup the Smart Switch shows as off but the light is actually on, then when you turn it on the light goes bright for a second and the switch reboots.
I've finally sorted it. So I was getting confused by the way the switch instructions are worded. You need TWO lives going into the switch and one neutral out, so I ran the second live to the switch and hey presto it's all working.
Thank you for your patience and for taking the time to help me Mr White
Please do not tell me that drawing is how you have wired it. You can not under ANY circumstances use the earth as a normal conductor. To do so is not only dangerous it has the potential to KILL ! electricity has no prejudices, it kills anyone
Your error is that you do not understand how electricity works, your switch does not need two lives, it needs a live and a switched live and a NEUTRAL as I said all along, most switches do not have a neutral and what you have done is in ignorance which will end up in some poor soul being electrocuted. Just because it works does not mean it is right or safe.
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