1. First check to make sure you are locking the lid into place.The lid turns clockwise and stops; to lock it in place you must push down on it and turn once more clockwise to make it go to the locked position.
  2. If the lid won’t lock check to see if one or more of the wedges that hold the lid down have come off. On DDC canisters built before 2016, the canister ring stop has a repair part, part number 005-670-6192-02. This is available to retro fit into your older style DDC canister.