--- title: CONNECT SERIES - How do I clear the memory of the room thermostat (LW921)? description: Below is a video on how to clear the device memory of the room thermostat. This can be done when the memory is full and you experience an problem when trying to pair to electric/boiler switches.     --- [Skip to content](https://support.lightwaverf.com/knowledge/how-do-i-clear-the-memory-of-the-room-thermostat#main-content) Open main navigation Close main navigation - [WhatsApp: +44 7480 784990](https://wa.me/+447480784990) [WhatsApp: +44 7480 784990](https://wa.me/+447480784990) How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://support.lightwaverf.com/knowledge?hsLang=en) 2. [Connect Series Support Archive](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en) 3. [Heating](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#heating) # CONNECT SERIES - How do I clear the memory of the room thermostat (LW921)? This process resets the thermostat so it can be paired again with a boiler switch or heating device. --- #### 🔧 What You’ll Need - Your **Lightwave LW921 Room Thermostat** - Access to the **paired switch or receiver** (if applicable) --- #### 🔁 Step-by-Step Instructions ### 1. Access the Thermostat Controls Start by waking up the thermostat screen if it’s idle. --- ### 2. Enter Reset / Pairing Mode - Press and hold the **pair/reset button** (usually located on the device or under a flap). - Keep holding until the display changes or indicates it’s in pairing/reset mode. 👉 This step prepares the thermostat to forget its previous connection. --- ### 3. Clear the Stored Memory - Continue holding the button until the thermostat confirms the reset. - This may show as: - A flashing icon - A reset message - Or the device returning to default settings Once complete, the thermostat has **cleared its previous pairing memory**. --- ### 4. Re-pair the Thermostat Now the device is reset, you can pair it again: - Put your **boiler switch / receiver** into pairing mode. - Trigger pairing from the thermostat (usually a button press). - Wait for confirmation (LED flash or on-screen message). --- #### ✅ What This Fixes - Thermostat not connecting to a switch - Pairing stuck or incorrect - Device previously paired to another system --- #### ⚠️ Tips - Stay close to the receiver when pairing - Make sure only one device is in pairing mode at a time - If pairing fails, repeat the reset process once more     - [What do I need? & System Setup](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#main-content) - [Getting started on the Lightwave App](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#getting-started-on-the-lightwave-app) - [Lighting](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#lighting) - [Heating](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#heating) - [Automations](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#automations) - [Third Party Integrations](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#third-party-integrations) - [FAQ's](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#faqs) - [Advanced Features](https://support.lightwaverf.com/knowledge/what-do-i-need-system-setup?hsLang=en#advanced-features) - [App Guidance & Automations](https://support.lightwaverf.com/knowledge/app-guidance-automations?hsLang=en#main-content) - [My Account](https://support.lightwaverf.com/knowledge/app-guidance-automations?hsLang=en#my-account) - [App Guidance](https://support.lightwaverf.com/knowledge/app-guidance-automations?hsLang=en#app-guidance) - [Automations](https://support.lightwaverf.com/knowledge/app-guidance-automations?hsLang=en#automations) - [Troubleshooting](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#main-content) - [General](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#general) - [Lighting](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#lighting) - [Heating](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#heating) - [Power](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#power) - [Automations & Hub](https://support.lightwaverf.com/knowledge/troubleshooting?hsLang=en#automations-hub) - [Installation Guides](https://support.lightwaverf.com/knowledge/installation-guides?hsLang=en#main-content) - [Link Plus Hub](https://support.lightwaverf.com/knowledge/installation-guides?hsLang=en#link-plus-hub) - [Lighting](https://support.lightwaverf.com/knowledge/installation-guides?hsLang=en#lighting) - [Power](https://support.lightwaverf.com/knowledge/installation-guides?hsLang=en#power) - [Relays](https://support.lightwaverf.com/knowledge/installation-guides?hsLang=en#relays) - [Connect Series Support Archive](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#main-content) - [General](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#general) - [Lighting](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#lighting) - [Heating](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#heating) - [Power](https://support.lightwaverf.com/knowledge/connect-series-support-archive?hsLang=en#power) - [Contact Us](https://support.lightwaverf.com/knowledge/contact-us?hsLang=en#main-content) - [Product Returns](https://support.lightwaverf.com/knowledge/contact-us?hsLang=en#product-returns) - [Contact Us](https://support.lightwaverf.com/knowledge/contact-us?hsLang=en#contact-us) [![Chill listening crop-3](https://support.lightwaverf.com/hs-fs/hubfs/Lightwave%20Logo%20Green%20Small%20(320%20x%20132)-1.png?width=58&height=24&name=Lightwave%20Logo%20Green%20Small%20(320%20x%20132)-1.png "Chill listening crop-3")](http://lightwaverf.com) [mailto:email@email.com](mailto:email@email.com) Copyright © 2025, Lightwave