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How do I put the room thermostat into pairing mode? (LW921)

This article provides clear, step-by-step instructions on how to put the LightwaveRF LW921 Room Thermostat into pairing mode. It guides users through locating the link button, activating pairing, and confirming a successful connection with the Lightwave app or boiler switch.

To connect your LightwaveRF LW921 Room Thermostat with your app or boiler switch, follow the steps below to enter pairing mode.

✅ Step-by-Step Instructions (General Pairing)

  1. Pull Down the Flap
    Open the front flap of the thermostat to reveal the control panel.

  2. Locate the Link Button
    On the left-hand side, find the button labeled "Link".

  3. Activate Pairing Mode
    Press and hold the "Link" button until the display shows "LINK".

  4. Pairing Confirmation

    • When pairing is successful, the screen will display "LINK OK".

    • This confirms the thermostat is now paired with your Lightwave app or boiler switch.

🔥 Pairing with the Boiler Switch

To pair your thermostat directly with the Lightwave boiler (heating) switch, follow these steps:

  1. Put the Boiler Switch into Pairing Mode
    Press and hold the pairing button located on the bottom left-hand side of the boiler switch.

    • The switch will begin to flash amber and green, indicating it is ready to pair.

  2. Activate Pairing on the Thermostat

    • Go to your thermostat and pull down the flap.

    • Press and hold the pairing button on the bottom left-hand side of the thermostat.

    • The display will show "LINK".

  3. Confirm Pairing Success

    • If successful, the thermostat will display "LINK OK".

    • The boiler switch will flash green, indicating a successful connection.

⚠️ Important:
You will need to perform this process quickly, so ensure the thermostat and boiler switch are next to each other during pairing.