Worcester Bosch Greenstar R35 thermostat wiring

[muggles]

@picasso I'm not convinced that NS is connected internally, given that linking it to N on the install I did was the difference between it not working and working...

 

[picasso]

Well NS is the neutral connection for the external controls and it has to be connected to the main neutral somewhere in the boiler.

 

[picasso]

This is a list of boilers that hive cannot be connected to

GC Number

Boiler Model

4710810

Worcester Bosch ICC2 - ZWBR 11-37A

4710811

Worcester Bosch *C*RD 537i

4710812

Worcester Bosch *C*RD 542i

4731156

Worcester Bosch Greenstar HE Plus - ZWBR 7-28A

4731157

Worcester Bosch Greenstar HE Plus - ZWBR 11-35A

4731175

Worcester Bosch *C* Greenstar 30 HE Plus Combi

4731176

Worcester Bosch *C* Greenstar 35 HE Plus L Combi

4731179

Worcester Bosch *C* Greenstar R 30HE Plus

4731180

Worcester Bosch *C* Greenstar R 35HE Plus

4731181

Worcester Bosch *C* Greenstar R 40HE Plus

as the stat is working on the other boiler it probably isisnt one of these models, if it is you have been very lucky

 

[Simon Morley]

NS is neutral send which is already connected internally, LS is live send and LR is live return aka switched live, I will be very surprised if your boiler works properly as this is a well known problem, please let us know how it goes.

First let me apologise for resurrecting such an old thread. However, I have this exact boiler (ZWBR 11-35 R 35 HE plus with TR2) and followed the advice given here to get it working with a Nest 3rd generation. I wired it as per mthorniley diagram also unplugged the TR2 and it works, the nest calls for heat and fires the burner correctly. However, when I look under info in the text display panel the burner switches on and off but the pump is always running. You mentioned a workaround? Is it possible to have a Nest working with a ZWBR 11-35 R 35 HE plus?

 

[Nataraj]

First let me apologise for resurrecting such an old thread. However, I have this exact boiler (ZWBR 11-35 R 35 HE plus with TR2) and followed the advice given here to get it working with a Nest 3rd generation. I wired it as per mthorniley diagram also unplugged the TR2 and it works, the nest calls for heat and fires the burner correctly. However, when I look under info in the text display panel the burner switches on and off but the pump is always running. You mentioned a workaround? Is it possible to have a Nest working with a ZWBR 11-35 R 35 HE plus?

Hi, Not sure if anyone is able to answer this...I am planning to install a Nest 3rd Gen thermostat but before i proceed i would like to make sure this indeed works with Greenstar R 35 HE Plus combi boiler. Simon, I see you are the last one who followed this post - did you manage to fix the issue around pump always running? Appreciate your feedback.

 

[ollski]

You can set them up to work but you have to isolate the control box which makes servicing etc a bit tricky

 

[Nataraj]

You can set them up to work but you have to isolate the control box which makes servicing etc a bit tricky

Thanks for your response mate, I am a bit new to this entire boiler setup. What do you mean isolate control box? I believed following the wiring on mthorniley diagram will help sort this problem and make Nest compatible but the side effects such as pump running?