Temperature nodes should typically reconnect themselves. If that hasn’t occurred, try clicking the button once next to the Hub. If this doesn’t fix it a full re-pairing may be needed. To fully re-pair the first node, hold the Hub’s right button down for 5 seconds and then the temperature node for 12 seconds. For the second node, hold down the Hub’s right button for 12 seconds and the temperature node for 12 seconds. Your app should now display readings to confirm your node has successfully reconnected.