Please check if the CO₂ cylinder has been correctly inserted following the steps in our How do I insert the CO₂ cylinder? article. Be sure to turn the cylinder as far as possible to ensure the insertion is complete.
If you are using a third party CO₂ cylinder please see our What CO₂ cylinders does Mitte Home support? article to confirm your cylinder is supported.
If these suggestions do not resolve your issue please contact Mitte Customer Success via our online request form for further assistance.