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OpenTherm wiring potential danger

DM92
Community Member

I recently had an annual revision of my boiler performed, and was advised that my Google Nest was wired wrong. Apparently, it is wired to OpenTherm despite the boiler not being OpenTherm, and this is dangerous. However, this technician was not familiar with Nest and tried rewiring to 1&2/ 2&3, but this failed. So I am not sure whether to trust the technicians who installed the Nest or the annual revision guy. 

 

If a non-OT boiler is wired to Nest via OT, how dangerous is it?

9 REPLIES 9

DM92
Community Member

My boiler is a: Thematek F 24 E

RXShorty
Gold Product Expert
Gold Product Expert

Hi @DM92 

The Nest Learning Thermostat (third generation) does support OpenTherm according to the Google support pages (https://support.google.com/googlenest/answer/9259109). 🙂
Currently, my third-generation is connected by using OpenTherm. 

Do you have a third-generation learning thermostat? 
If you don't know here is a LINK on how to check which version you own.

DM92
Community Member

Yes the thermostat is compatible with OT. As I mentioned, the issue is with compatibility with the boiler, which is apparently not OT compatible. What would be the danger of wiring via OT if the boiler is not suited?

One technician installed via OT, and the other said this is wrong and dangerous because the boiler is not OT. I am trying to figure out who is correct.

Jhonleanmel
Community Specialist
Community Specialist

Hey there, 

@RXShorty, thanks for the help.
@DM92, I understand that this may be confusing as two technicians have two opposing advice. I suggest contact a pro installer to discuss your options. 

Best, 
Mel

EdwardT
Community Specialist
Community Specialist

Hi DM92,

 

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

 

Thanks,

Edward

DM92
Community Member

Hi Edward. Yes I am still wondering if wiring a non-OT compatible boiler to Nest over the OT wiring is dangerous.

EdwardT
Community Specialist
Community Specialist

Hi DM92,

 

Thanks for the response. I agree with Mel's response. I would suggest reaching out to our Nest Pro technicians so they could take a closer look at your system and advise you about installing a non-OT boiler. You can click on this link to learn more about our Nest Pro services.

 

Thanks,

Edward

Jhonleanmel
Community Specialist
Community Specialist

Hey folks,
 

@EdwardT, thanks for the help.
@DM92, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Mel