Installing nest, help please

[Jon Baker]

I have an ideal classic boiler and a lifestyle LP241 programmer, no thermostat on the system. I can turn heating and water on and off separately or together.

I want to swap the programmer for the nest heatlink and then control it with the nest thermostat third gen (which says it can control hot water).

My existing programmer has the following wires.
Live
Neutral
Earth

HW ON
CH ON
HW OFF

The heatlink appears to ask for four wires, hence my confusion. It asks for CH Call for heat (i presume this means on), CH common, HW call for heat and HW common. On the basis that hte old programmer had only got a connection to heating on, i connected CH ON from the programmer to call for CH call for heat, HW ON to HW call for heat and HW OFF to HW common. What am i missing?

Thank you.

 

[Cgas]

If you refer to the search function this topic has been covered about 30 odd times previous, your welcome.

 

[Jon Baker]

Thanks For th suggestion.

 

[muggles]

Link Live to CH common and HW common. Everything else is blatantly obvious

 

[Agile]

Everything else is blatantly obvious

I would not be too sure of that!

 

[DP]

Everything else is blatantly obvious

I would not be too sure of that!

What do you mean?

 

[ianmcd]

Everything else is blatantly obvious

I would not be too sure of that!

What do you mean?

Dan I feel a BBC story coming

 

[DP]

Everything else is blatantly obvious

I would not be too sure of that!

What do you mean?

Dan I feel a BBC story coming

 

[FiremanT]

Everything else is blatantly obvious

I would not be too sure of that!

What do you mean?

Dan I feel a BBC story coming

I feel 22 pages coming

 

[hertsboilers]

As Andrew said, connect two commons to the live. Also old HW off to new HW satisfied (4).

 

[Agile]

Everything else is blatantly obvious

What do you mean?

I mean that what is blatantly obvious to one person may not be blatantly obvious to another person.


Thought that was obvious!