Boiler keeps coming on when not timed to since ST9100C installed

[DIY15]

What does this picture and instructions mean.
I don't know where the wires are on the bolier so can't show you how they are wired up

 

[Nico]

That’s is describing what I was talking about earlier with the wiring loop that needs removed but as someone mentioned earlier if you boiler was working previous with mechanical timer and thermostat then this link should have been previously removed

 

[DIY15]

Ohh right. Ok so it might not actually be there at all?

 

[Murdoch]

You need to get the person back who changed the items and get them to fix it properly

Have you paid them?

 

[DIY15]

It was first fitted 4 years ago. With a mechanical timer and room does that mean the link would not be there?

 

[DIY15]

Yes hes working till 5pm today so coming tomorrow now. Yes paid him.

It's just confused me to why this happened

 

[Murdoch]

It's just confused me to why this happened

Connected incorrectly is almost certainly the problem ................ swapping one controller for another isn't as easy as most people think ........ then changing a room stat can also create issues.......

 

[DIY15]

I' starting believe that now. Just worried if he don't actually know what he' doing. What nico said about moving the black wire has worked but I will see tonight of the heating comes on the night.

Oh nico before when i said the room thermostat worked with the timer is didn' it was just the light come on when the boiler did but not programmed to. Sorry for confusion