OpenTherm weather dependent heating control

[Maciek90]

Is this what you meant?

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{
	"Battery" : 255,
	"LastUpdate" : "2025-06-22 14:56:02",
	"RSSI" : 12,
	"description" : "",
	"dtype" : "Temp",
	"hwid" : "47",
	"id" : "145AE",
	"idx" : 1374,
	"name" : "In",
	"nvalue" : 0,
	"org_hwid" : "47",
	"stype" : "LaCrosse TX3",
	"svalue1" : "26.00",
	"unit" : 1
}

[akamming]

What do the general status and opentherm status of the main screen of the firmware show?

Could you also switch on the "Debug Messages to MQTT", and then post the output of the following command (make sure you do a restart after you typed this command):

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mosquitto_sub -t domesphelper/text/DebugToMQTT/state -u <your username> -P <your password> 

You should see something like:

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07:24:11 Configfile saved
07:24:14 Succesfully (re)connected, starting operations
07:24:15 Time was set
07:24:22 Received message on topic [domoticz/out/2019], payload: [{
        "Battery" : 255,
        "LastUpdate" : "2025-06-23 08:19:56",
        "RSSI" : 12,
        "description" : "",
        "dtype" : "Temp",
        "hwid" : "36",
        "id" : "0002",
        "idx" : 2019,
        "name" : "Ground Temperature (10 cm)",
        "nvalue" : 0,
        "org_hwid" : "36",
        "stype" : "LaCrosse TX3",
        "svalue1" : "16.3",
        "unit" : 2
}
]
07:24:22 First temperature (16.30) received, ready for climate mode
07:24:22 PID Mode, PID=(0.00,16.30,73.70), total: 90.00
07:24:23 PID Mode, PID=(0.00,16.30,73.70), total: 90.00
07:24:24 PID Mode, PID=(0.00,16.30,73.70), total: 90.00
07:24:26 PID Mode, PID=(0.00,16.30,73.70), total: 90.00
07:24:27 PID Mode, PID=(0.00,16.30,73.70), total: 90.00
07:24:28 PID Mode, PID=(0.00,16.30,73.70), total: 90.00

[Maciek90]

What do the general status and opentherm status of the main screen of the firmware show?

as in the picture below

Could you also switch on the "Debug Messages to MQTT", and then post the output of the following command (make sure you do a restart after you typed this command):

Code: Select all

14:31:59 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:00 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:01 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:01 Received message on topic [domoticz/out/1374], payload: [{
        "Battery" : 255,
        "LastUpdate" : "2025-06-23 15:32:02",
        "RSSI" : 12,
        "description" : "",
        "dtype" : "Temp",
        "hwid" : "47",
        "id" : "145AE",
        "idx" : 1374,
        "name" : "In",
        "nvalue" : 0,
        "org_hwid" : "47",
        "stype" : "LaCrosse TX3",
        "svalue1" : "27.00",
        "unit" : 1
}
]
14:32:02 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:03 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:05 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00

[akamming]

What do the general status and opentherm status of the main screen of the firmware show?

as in the picture below

Could you also switch on the "Debug Messages to MQTT", and then post the output of the following command (make sure you do a restart after you typed this command):

Code: Select all

14:31:59 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:00 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:01 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:01 Received message on topic [domoticz/out/1374], payload: [{
        "Battery" : 255,
        "LastUpdate" : "2025-06-23 15:32:02",
        "RSSI" : 12,
        "description" : "",
        "dtype" : "Temp",
        "hwid" : "47",
        "id" : "145AE",
        "idx" : 1374,
        "name" : "In",
        "nvalue" : 0,
        "org_hwid" : "47",
        "stype" : "LaCrosse TX3",
        "svalue1" : "27.00",
        "unit" : 1
}
]
14:32:02 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:03 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00
14:32:05 PID Mode, PID=(0.00,27.00,-17.00), total: 10.00

It’s working correctly. Your setpoint is set to 19. It recieves a value of 27 so the setpoint for the heating/cooling device is set to 10. What is the issue then?

[Maciek90]

Oh sorry, my mistake! I was looking at the Temperatures>Thermostat>-127 (like in the picture) readings. Now I know that the inside temperature works fine.
I have another problem. What about the outside temperature? I don't have a dedicated outside temperature sensor for the boiler. Until now, I used the sensor in Domoticz. In the plugin, I could provide its IDX. How can I currently use the sensor from Domoticz?

[akamming]

Oh sorry, my mistake! I was looking at the Temperatures>Thermostat>-127 (like in the picture) readings. Now I know that the inside temperature works fine.
I have another problem. What about the outside temperature? I don't have a dedicated outside temperature sensor for the boiler. Until now, I used the sensor in Domoticz. In the plugin, I could provide its IDX. How can I currently use the sensor from Domoticz?

outside temperature is the opentherm outside temperature (in other words: it will give a reading if you have an outside temperature attached directly to your boiler)

I understand your point: wasn't aware of it until now, but indeed since you could use any idx for outside temperature using the plugin. when you use the firmware itself as thermostat, you can only use the internal sensor. It is a good idea though, Maybe in the future i will add this capability.