Honeywell T3R to LG Therma V wiring

[Grinzola]

Looking for some guidance
Lg Therma V heat pump had an optima wireless programmer which died
Want to replace with a T3r
Wired the same way earth neutral and then live with live bridged which work but there is no Neutral to switch
Some photos

Not my wiring !!!
I assume it just needs a neutral back to a perm neutral inside the LG

Anu guidance appreciated

 

[RandomGrinch]

Wired the same way earth neutral and then live with live bridged which work but there is no Neutral to switch

Sorry, I'm not really sure what you mean about no neutral to switch?
If the Optima was working then wouldn't its neutral have been attached via the blue wire?

You could really do with a four core cable, it is no longer permitted by the regs to have a green/yellow wire as a switched live.
The cable clamps should also be used!

 

[Grinzola]

This is what I found when I opened the optima remote unit
I agree about the 4 core cable
What is. On fusing is that this setup worked with the optima before it gave up
With the live being looped to one side of the switch
But it doesn't work on the T3r
Should there not be a neutral running to the right hand connector

 

[RandomGrinch]

Can you take a picture of the white writing under the wiring and terminals of the Optima?
I suspect it will say something like NO, COM, N and L.
With the Brown going to L and a link to COM.
The Blue going to N
And the green/yellow isn't an earth connection, but is a switched live going to NO.

If you replicate that wiring on the T3R, as in your last photo, it should work.

No, there shouldn't be a neutral to the right hand connector.

 

[Grinzola]

Can you take a picture of the white writing under the wiring and terminals of the Optima?
I suspect it will say something like NO, COM, N and L.
With the Brown going to L and a link to COM.
The Blue going to N
And the green/yellow isn't an earth connection, but is a switched live going to NO.

If you replicate that wiring on the T3R, as in your last photo, it should work.

No, there shouldn't be a neutral to the right hand connector.

Pics as requested
I only have 3 wires coming in
The old board is labelled
N
L
OUT1
OUT
Last pic is the T3r

 

[RandomGrinch]

I only have 3 wires coming in

And the green/yellow isn't an earth connection, but is a switched live going to NO.

Again, the green/yellow wire isn't an earth connection.
As it was in the Optima, it is a switched live - it will connect to the T3R terminal B.

This is why you need a 4 core cable...

You could really do with a four core cable, it is no longer permitted by the regs to have a green/yellow wire as a switched live.

 

[Grinzola]

4 core cable ordered
Then u will look at it again
Thanks

 

[Grinzola]

 

[Grinzola]

So conne ted the switched terminal ro B on the t3r
Wireless conne tonight is working as when I call for heat the t3r clicks and says on but nothing happens on the heatpump
From the thermostat
Live conneted to terminal 14
Neutral to terminal 15 and what was connected to earth on the optima is connected to 17

 

[Grinzola]

Appears to work now
Thanks for help