Netatmo Smart Thermostat to replace Engie Boxx
Engie, my provider, has stopped supporting their "smart thermostat" solution since july 2024.
I want to replace the with the Netatmo Smart Thermostat, but I do not know how?
Morely, how do I connect the NetatMo Smart Thermostat (wire layout)?
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If your „Engie Boxx“ looks like this then the Netatmo Relais brown/blue wires have to be connected to the ones on the left (N/L) matching the colors and the black/grey wires to those connected to 1/2 (polarity doesn‘t matter).
Thanks GEORGzer for your explanation!


The "Engie Boxx" in your foto is actually the unit which is connected to my boiler (Vaillant ecotec pro VCW 286/5-3 (E--BE) R6). I presume this unit is the "interface" between my boiler and thermostat (for openTherm compatibility?)
The thermostat is only connected with 2 wires. To which should I connect them (5/6 display)?
Since I don‘t really know what that „Engie Boxx“ does, I can only speculate.
Vaillant boilers don‘t support OpenTherm directly, as far as I know. There are „adapters“ that connect to their BUS system, maybe this „Engie Boxx“ does exactly that.
If you got the Smart Modulating Netatmo Thermostat, you can only wire the Relais directly, since the Thermostat itself has no connectors and can only be used wirelessly.
And now back to speculating: connect the Relais brown/blue wires to a power source and the black/grey wires instead of your „display“ and see what happens. Maybe it can communicate (OpenTherm) or it just works as a dry-contact thermostat or it won‘t do anything at all.
In that case you will have to connect the Netatmo Thermostat directly to your boiler. Which I thought is what you wanted to do, since you titled this „replacing Engie Boxx“ 🤪
I‘ll move this to the „Smart Modulating Thermostat“ section for now.
Hi GEORGzer,
Thanks for your help.
The box with the 3 pair of wires is indeed a system which makes it possible to communicate via openTherm.
My photo (the 2 wires) comes from that box and is the power/communication with the thermostat (my second picture.
I need to connect the NetAtmo thermostat with these 2 wires.
Or, can I connect a NetAtmo wireless thermostat (which I can connect to the box with the 3 pairs f wires), as you described before?
If you want want to use the OpenThem Thermostat then you have to connect the Relais to those wires. The „Smart Modulating Thermostat“ itself has no connectors and can only be used wirelessly.
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