Remeha Etwist thermostat

Configuration
1

Hello everyone,

I have a new central heating boiler from Rehema, a Tzerra Ace, which has several communication methods, including its own serial bus with which you can monitor the boiler with a service tool and the like, but I cannot find a pinout for this boiler unfortunately …

But it also communicates via Open-Therm and Etwist / R-bus, at the moment I have an open therm gateway between the boiler and the (open-therm) room thermostat, but I am going to use an Etwist thermostat for it (still to be delivered ) which can also be operated via the remeha etwist app, google home and IFTTT.

Now I wondered if this etwist can also be linked directly to Home_Assistent without needing the open therm gateway anymore.

the advantage of this is that I can connect the Etwist thermostat directly to the boiler without having to convert the open therm to R-bus first, so less chance of errors, and probably better communication?

I myself am not at home is google Home or IFTTT, but who knows, who knows, with some help?

thank you in advance.

dzjr

2

Hi, I’m getting my new Remeha heating boiler with eTwist Thermostat next month. I already did some searching and found a method using IFTTT, but my experiences with IFTTT recently were disappointing, so i’m looking for other, more reliable ways. I’ll let you know when i find something usable.

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3

Hi, I’m getting my new Remeha heating boiler with eTwist Thermostat end of this month. I’d be really interested if you do find something!

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4

Did you find a way to make this setup work?

5

I can’t get it to work via the ETWIST, only some IFTTT messages, but I don’t get any malfunction and status messages such as water pressure, burner status, etc.
so I now have the etwist GW after my OT Gateway, and the OT Gateway is then connected to HA again, I already had this function running, so actually only use the ETWIST as a clock thermostat which I can easily operate.

So it could also be done with HA itself, but then you always have to open HA, and provide a th sensor yourself

6

Ok i will have to do some more research then, i don’t have a OT gateway yet and my Etwist is connected to the R-Bus. Is it also possible with it connected to the R-Bus or do i need to get the etwist gateway as well? Thanks for the help. Really appreciate it

7

I think you can connect the Etwist directly to the R-Bus, if your boiler supports that (Remeha Ace?) of course.

I already had the OT Gateway running, and I would like to read the current data, so I did it like this.

Saw that others had done research, but that Remeha doesn’t release anything…

and through IFTTT you only have limited options.

8

Yes it’s the calenta ace. I have it connected to the R-Bus. And have the app working but i want it in my HA system as well. So if I add the OT gateway this should be possible right.

9

Yes, with the otgw you van monitor all the signals from the boiler, And Read them into ha.

If you use a otgw you also need a etwist gateway.

10

Thanks i’m going to try it.

11

Nope, no go. Bummer.
Oh well… at least i can now program the thermostat with my mobile phone. Big improvement. :slight_smile:

12

So I have the Calenta Ace40c boiler with a Etwist thermostat. I now have the otgw connected and in HA, I don’t have the etwist gateway, suppose to be installed in the boiler already with the ace. But my Etwist doesn’t turn on anymore. Do I really need an etwist gateway as well? And do i have some wiring wrong since the thermostat doesn’t turn on anymore? This is how i have it connected:

IMG_4918
IMG_49181920×2560 324 KB

The black wires go to the r-bus of the boiler, and the orange and blue go to the thermostat.

And this is how it looks in HA

Screenshot 2021-11-15 at 13.32.05
Screenshot 2021-11-15 at 13.32.05996×566 35.7 KB

13

The boiler has 3 differerent modes On\Off, Open-Therm & Remeha Protocol.
The Etwist works witht the remeha protocol and is no longer working if you connect the open therm gateway becouse the boiler will go to open therm mode. I have the same boiler and connected a Honywell Thermostat with the Open Therm Gateway now everything is working fine.

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14

Thanks for the info!

15

I just found out about another way to connect the etwist to HA.

I made a small modification to BDRthermostatHA you can find it here: https://github.com/freitdav/BDRthermostatHA/pull/2.

Please let me know if it works for you

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16

Hi @MMoerdijk1, maybe a very stupid or stupid question, but how can I add your integration to HA?

17

Great, this was just what I was looking for.
I needed to do some small fixes, but now it works!!

18

I installed the integration via HACS, first via the old version, where I have to enter the pairing code, then I got error messages, now I have run the update where I only have to enter the email and password, I’m sure it’s the right one has been seen in the app it does work, and then I get an error message, with the following log messages

Can someone tell me what I’m doing wrong?

2022-07-27 16:53:21 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry BDR Thermostat for bdr_thermostat
File "/config/custom_components/bdr_thermostat/__init__.py", line 59, in async_setup_entry
File "/config/custom_components/bdr_thermostat/BdrAPI.py", line 46, in bootstrap
File "/config/custom_components/bdr_thermostat/BdrAPI.py", line 71, in _login
File "/config/custom_components/bdr_thermostat/BdrAPI.py", line 117, in async_post_request
File "/config/custom_components/bdr_thermostat/BdrAPI.py", line 106, in _sync_request
File "/config/custom_components/bdr_thermostat/BdrAPI.py", line 103, in _sync_request
19

Im stuck having to add a pairing code which I dont have. How do I fix this?

20

Go to settings on your Thermostat, add device and request an paring Code.

It the same procedure as for the app