Thank you all for your help. I checked the wiring in the wiring centre and put it back to how it was. Working fine now
Thanks again everybody for your help
Sorry been a frustrating day. This is what I have done so far. I know the wiring needs tidying up
Remove wires from timer .
Live goes to live neutral goes to neutral
From live link to 2 and 5
Then from old timer put 4 of old timer into 3 of nest =ch on.
Then 3 of old timer into 6 of nest...
I have installed the nest replacing Grasslin control box and Honeywell thermostat. I can only get hot water and heating when the nest thermostat isn't connected. Any suggests??
Thank you for your help. I have been busy on another project
The part I didn't understand was this
Remove wired room stat and connect common and sl together = 1 &3 .
Also I was asked to include the wiring for the main box and the thermostat
Your help is appreciated