This means that your Air Cooker or Airfryer is not connected to your home Wi-Fi anymore. You might have changed your home Wi-Fi network and need to set up your appliance again.
Air Cooker:
Start the Wi-Fi set-up process by entering Tools → Settings → Wi-Fi Setup on your appliance and follow the on-screen instructions.
Airfryer:
Make sure that your Airfryer is a connected model: HD9255, HD9280, HD9285, HD9880.
To start the pairing process, start the setup directly from the settings in the HomeID app or follow the steps as described below to start pairing with your Airfryer:
HD9255, HD9280, HD9285: long-press the temperature down button and follow the instructions in the app.
HD9880: go to Settings → Wi-Fi Settings → Wi-Fi Setup mode, then follow the instructions in the app.