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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

All sorted now

Not sorted yet. The boiler doesn't come on when the thermostat is connected

Thank you I am using the nest thermostat wireless

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??

I thought the working was working but it isn't unfortunately. I can only get heating and hot water when the nest isn't connected. Any suggestions???

Thank you for your help!! Nest is working!!

Thank you I am going to fit it on Saturday

I have posted some photos on line. I am going to fit it on Saturday

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

Any help would be appreciated.

I have a grasslin tower chron QE2 and a mechanical Honeywell thermostat. Is it easy to fit the nest

I want to install a nest 3rd generation instead of the Grasslin programmer. I have a separate Honeywell mechanic room thermostat. Is this easy to do?

Wiring