Controlling Boilers via EMS (BBQkees-EMS-ESP (Wifi+RJ45-Eth MQTT gateway), from Home Assistant

[RonnAndrea]

Dear EMS-Boiler community,

I’m new to controlling Boilers via EMS and MQTT!
I’ll try to be as concise as possible…
I have Home Assistant installed and working fine…

I acquired and installed:

1. BBQkees-EMS-ESP (Wifi+RJ45-Eth) Gateway, and
   A. connected the EMS cable to my Junkers Cerapur Boiler,
   B. connected 15 x DS18B20 Temperature Sensors...
   I have a rather complex and hybrid Home Energy Management on my Solar Panels… All this works just perfect…

I swiftly installed the BBQkees-EMS-ESP Gateway, and it worked just out of the box following the installation instructions…
Amazing, also all the 15 x DS18B20 Temperature Sensors acquired as sensor cables from Amazon the same easy way…
2 hours of work in total, and I had all the 150 values able in Home Assistant…
EXCELLENT…

2. My primary challenge is to control the boilers “heating_temp” setpoint from Home Assistant (HA).

3. My boiler is a Junker Cerapur condensing boiler:
   bosch junkers condens Cerapur Excellence-compact ZWB 30/32 A 23
   (8370-138-000024-7736503756)
   The boiler has a Domestic Hot-Water (DHW) heating module as well.

4. The DHW goes to into the 300l Junkers electric Water heater, that is heated with only Solar Energy…

5. My second challenge is to control the boilers “DHW_temp” setpoint from Home Assistant (HA), so the boiler only produces Warm DHW when there is NO solar Energy on rainy days…

Back to the primary challenge is to control the boilers “heating_temp” setpoint from Home Assistant (HA).

I have temperature sensors on the north and south side of my house. I can also take the wind-speed into account…
With this I calculate a “heating_temp” setpoint for the boiler that compensates for temperature loss in the radiator and under-floor heating circuit due to the increased power consumption on cold winter days… and automatically switches off the heating during warm summer days, keeping maximum comfort and minimum consumption at the same time, and all with no effort…
The Problems:

1. From EMS-ESP Gateway webpage/devices I have a list of all 100 boiler variables…

2. Some of the variables are writable, and this is the case for setpoints, as you can change them, applying the correct write or update procedure…

This is exactly the problem that I have…

When I update “heating_temp” or “heatingtemp” from 40 to 50, I see that the EMS-ESP Gateway performs it as the temperature goes to 50 for some seconds and then it is bumped back down to 40 again by the boiler I presume…

3. I need to know the boiler-internal-rules for changing the heating_temp from the 40 ºC set by the heating_temp knob on the boiler.

4. The same problem happens to the DHW temperature setpoint on the other DHW_temp knob on the boiler.

Any help is very appreciated…!!!

[VlastiBroucek]

3. I need to know the boiler-internal-rules for changing the heating_temp from the 40 ºC set by the heating_temp knob on the boiler.
4. The same problem happens to the DHW temperature setpoint on the other DHW_temp knob on the boiler.

You need to set the knob on the boiler to more than you want to set by EMS-ESP, otherwise the knob pushes it always back to its setting.

[proddy]

https://docs.emsesp.org/Troubleshooting/#changing-a-value-works-at-first-but-is-then-reset-to-its-original-value

[VlastiBroucek]

Also, OP does not say anything about potentially having Thermostat that would be overwriting it too... OP should post more details about his system.

[RonnAndrea]

Thank you for the constructive replies proddy & VlastiBroucek;

First:
There is NO thermostat unit connected to the boiler, it was working as a stand-alone unit until now…

Next:
Ok, let me dial the knob to 90 ºC,
NOTE:
This solution un-comforts me, as a connection failure between HA and the boiler will keep the boiler at 90 ºC,

Test:
I’ll just test it…
Boiler knob 1 set to MAX: 82 ºC
I go to the EMS-ESP Web interface where I can write the values…
I have focused on two values:

1. “heatingtemp” (vs. “heating_temp” that does not exist) and
2. “selflowtemp”…
   When I change “heatingtemp” to 30, it swaps immediately back to 82.
   When I change “selflowtemp” to 30, it stays at 30 for approximately 2 minutes and then it swaps back to 82.

Conclusion:
With this, I do not clearly see my way out of the problem…
Can you see any meaning in this?

Thank you for the help so far…
I hope that there is one out there that can settle this a bit more…
So Help is still needed…

I added two screen captures: