Wiring not correct - Honeywell BDR91 to Nest e

[jimmybond007]

So I really should have got an electrician but there you go. So after wiring I get the message from the thermo that it cannot detect and open therm.

I terminated N and the middle L and connected B to No. What has thrown me is the the L on the right was connected to A. So that wire is now removed and I have nothing in A on the Heat Link

Hope that makes sense!

 

[flameport]

Brown = C
Black = NO
Grey is not used

 

[CBW]

The BDR91 isn’t wired up to opentherm either, so this would need changing at the boiler end if your boiler supports it.

 

[jimmybond007]

Brown = C
Black = NO
Grey is not used

I dont have a brown to go to C unless you mean link it from L to C (I had a link from L to A on the BDR91)

 

[jimmybond007]

The BDR91 isn’t wired up to opentherm either, so this would need changing at the boiler end if your boiler supports it.

oh right. But others seem to have wired it fine...

 

[flameport]

I dont have a brown

 

[jimmybond007]

ok so as I understand it. From left to right on my BDR91

N = terminate
L = C (on Heat link)
L = now empty
A = now empty
B = NO (on Heat link)

 

[jimmybond007]

View attachment 282667

Can I just say thank you very much. All works now. As for open therm - you just need to set the thermostat to on/off in the settings.