Y plan heating with vaillant eco tech boiler and nest link

[Stuckinarut]

Yep
That’s the cables from the wiring centre to a simple light switch on the wall adjacent to the boiler
Then the 5 core to the boiler

I’ve just edited my message above

 

[Paulfg]

Sorry don’t understand?

 

[Stuckinarut]

Sorry don’t understand?

I edited my previous message, here’s what it says:

That’s the boiler switch! Yikes, starting to think it could still be a wiring issue then. A boiler should be via a fused switch or removable plug.

Yes, front cover to be removed, then access the pcb via the drop down panel

 

[Paulfg]

That is worrying
Beginning to think this is a job for a proper heating engineer?

 

[Stuckinarut]

That is worrying
Beginning to think this is a job for a proper heating engineer?

Might just be worth it.

 

[Paulfg]

After the discovery of the cables going to the boiler with just the live being switched
I decided to open up the boiler to see how these cables were connected and was there a link left in??
After seeing the set up (see attached photos) I’m beginning to think it may well be the three port valve resistors or motor??

 

[Stuckinarut]

No link was left in. Either motorised valve failure or wiring fault, probably the former.

 

[Paulfg]

Thanks for your support
Need to go back to the original plan and change the valve and sort out the wiring centre
Thanks again