Remeha Avanta 35c and Celcia 20 - issues

[raduman]

Hi all

I have bought the OpenTherm GW with the idea to monitor what my old Remeha Avanta 35c is doing. She works almost continuously due to the fact that I have an under-sized radiator in the living room but that's not for this forum maybe.

So, bought the GW in September, and i encounter 2 issues and 1 user failure
Issue 1: the Remeha Celcia 20 resets itself out of the blue, totally random so we are left without heating (some morning I had 15 degrees celsius in the living room). Only when connected through the GW, otherwise is stable as a rock when connected directly to the Avanta 35c. If this cannot be solved I have to ditch the OTGW or even the CV completely so I am struggling to solve it somehow...
Issue 2: the wifi module within the OTGW crashes and kills my wifi around the home until I reconnect it. Any ideas here?

User failure: I am not able to install OpenTherm Monitor (latest version) in a docker container under Linux. Anyone did it until now?

Thank you all very much in advance and I wish you Happy Holidays!

[hvxl]

Issue 1: I have not had reports of such problems from other Celcia 20 users. Have you looked at logs at the time this happens? Without concrete data it will be difficult to solve an issue like this.
Issue 2: What firmware are you running on the Wemos? Have you tried different firmware? If it kills all of your WiFi, it could also be a hardware problem.

User failure: I have built a docker image. You can run it using:
docker run --user $(id -u):$(id -g) -dp 2380:8080 -e TZ=Europe/Amsterdam -v $HOME/.config/otmonior:/data -v $HOME/otlogs:/log hvxl/otmonitor
The web server is then available on port 2380.
See http://otgw.tclcode.com/docker.html for more information.

[raduman]

Thanks for your reply! I have installed the docker container with otmonitor, works fine

I think I have found the reason why the Celcia crashes:
22:38:33.077559 00000011/00001010,60.00,00000011/00000011,0.00,0.00,100.00,0/0,19.91,18.00,0.00,0.00,0.00,19.00,60.20,0.00,0.00,0.00,0.00,0,50/40,60/20,60.00,60.00,00000000/00000000,0,0,65535,65535,65535,65535,11248,14064,65535,2216
22:38:53.344395 Error 03
22:38:53.344612 Low power
22:38:53.452469 Low power
22:38:59.404564 Error 03
22:39:02.799990 SC: 23:39/7
22:39:02.817956 PR: G=00
22:39:02.828133 PR: I=11
22:39:02.844038 PR: O=N
22:39:02.852092 PS: 1

I am using a 2.4 Amp Samsung adapter as a power supply - I believe this should be more than enough?

Also, could this be the reason why the wifi module crashes (at different rates and not in the same time with the comms drop for the thermostat?)

Which power supply do you recommend, then?

Thanks again
Radu

[hvxl]

I see no reason for the Celcia crashes in the data you provided. ("Low power" is not an error indication. It just reports the Smart Power state, which can be low, medium, or high. Low power is the normal state.)

The OTGW doesn't require much power at all. A 1A power supply should suffice.

[raduman]

Could it be because of Domoticz?
I stopped the domoticz container and no reboot of Celcia since then (more than one day)...

[hvxl]

Domoticz should not be doing anything that could cause the Celcia to crash.

My current best guess is that perhaps communication between the OTGW and Celcia stops working and that causes the Celcia to throw a tantrum. Logs would show if that is the case (but not the kind of logs where Domoticz has switched off reporting of the messages).

One possible reason for communication to stop could be a reference voltage that is near the limit of what works. Then a little change in temperature can make it go over the limit. If it happens again, check which voltage reference values work and which don't. Then set it to the middle of the working range. The diagnostics firmware can also be used to determine the best voltage reference setting. But installing that may be more work than doing it manually.

[raduman]

Thanks Schelte so much for your patience and support!

Meanwhile I have dropped the old Celcia 20 in favor of Nest Self-Learning Thermostat V3 - I know it's flawed and it shows 2 degrees more than the actual value but it's quoted as the best OpenThermostat available on the market - although it might be an overkill, I think I will stick to the OpenTherm Gateway to see what happens from now on - if it will generate issues with the Nest V3 or not...

Happy Holidays, I will keep you posted

[hvxl]

Too bad you are giving up on the Celcia 20. I don't like unresolved mysteries. I would have liked to figure out why it's not working for you. Although I can also understand that you prefer a reliable heating system at this time of the year.