How to get the help you need Épinglée

Brieuc Community manager

To get advice on how to connect the Netatmo Modulating (OpenTherm) Thermostat and Relay to your setup, please take the following steps:

Search for your boiler brand and model
A solution for a similar setup like yours may have been provided already and can be found in this forum.
Different line-ups of the same boiler brand usually have a lot of similarities and the electrical setup does not differ.

If you can’t find a solution to your problem, create a new topic
State the brand and model of your boiler as the subject of your topic, so that other users with a similar setup are able to find it.

Tell us what you want to do

  • Wire the Relay directly to the boiler and use the Thermostat wirelessly.
  • Wire the Relay instead of your old room thermostat (necessary if the boiler is offsite or out of Wi-Fi range).

Note: Unlike the standard Netatmo Thermostat, the OpenTherm Thermostat has no physical connectors and can‘t be wired directly. The Relay has to be wired to the boiler.


Take a peek in your boiler’s manual
Look for any mentions of “connecting an external thermostat”. Electrical schematics can often be found as well and help identify the correct terminals on the board.

Make sure that you have identified the correct fuse to switch off your boiler’s power supply before you open it or do any wiring
If you have no experience with electrical installation at all, you may consider hiring a professional.

Provide a photo of your current thermostat and your boiler’s label
If possible also attach a photo of your boiler’s circuit board. Instructions on how to access the board can be found in the manual.
If you don’t have a manual anymore, you may find it on the internet, ex. the manufacturer’s website or sources like freeboilermanuals or manualslib.

Identify the 4 wires of the Relay's boiler adapter cable
The brown and blue wires need to be connected to a permanent power supply, so that the Relay is functional and can connect to your Wi-Fi network.
This can be your boiler's power supply (some models also provide extra 230V outputs), an external power supply or you can attach a power plug.

The black and grey wires are for controlling your boiler and have to be wired to your boiler’s OpenTherm/BUS connector.


It is also possible to use the OpenTherm Thermostat on an „analog“ boiler
When the Relay is powered ON, it starts an auto-detection phase during which the Relay switches a few times, looking for an OpenTherm connection.
It can take up to 3 min. If after those 3 minutes no OpenTherm signal is detected, the Relay switches to basic ON/OFF mode.


And finally after creating a topic, subscribe to it or come back on a regular basis
Sometimes there are followup questions that need to be answered. It is also nice to let everyone know if you succeeded. 


Happy wiring!

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