Integrating Danfoss ECL 120 controller

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1

Hi,

I am trying to integrate a Danfoss ECL 120 controller that should have modbus over RS485 but I am not able to get any register values from the controller except PNU 4399 (Outside temperature) - but even that value is only returned as 0 degC. But at least I know that the modbus interface works and responds.

Does anyone have any experience with integrating this controller that could give me a few hints where to find information needed (e.g. PNU list)?? Or simply tell me to forget using modbus for the integration :slight_smile:.

The controller also has a LAN interface that is used for transfering data to Danfoss’ LeanHeat monitor servers that can be access via https. Maybe this could be integrated instead??

Thanks in advance…

Regards,
HassNewBee

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2

Have a look at GitHub - Ingramz/ecl110: MODBUS protocol for Danfoss ECL Comfort 110
It might be similar.

Regards, Søren

3

Hi HassNewBee, did you succeed getting data from ECL 120 controller to home assistant?

Regards

Jesper

4

Hi,

I’ve actually been working on exactly this recently — integrating the Danfoss ECL 120 / ECL 220 via native Modbus (RS-485), and I can confirm that it does work, but the documentation from Danfoss is very limited, and some registers are not obvious at all.

To make things easier, I’ve created a dedicated Home Assistant integration for ECL-controllers, which already supports reading a range of core temperature sensors (S1–S6), valve position, heat flow references, etc.

:link: You can find it here: