1. First, check and clean the parts connected with the oven door to ensure that there are no impurities and burrs on the surface.

2. Then find the sealing strip, which is installed at the top and bottom of the door.

3. Then place the sealing strip on the door frame, and make sure that it fits completely with the door frame.

4. Then align the oven door with the installation position of the oven to ensure that the door completely fits the sealing strip of the oven.

5. Then adjust the position of the door to ensure that the door completely fits the edge of the oven.

6. Then adjust the position of the door lock to ensure that the door lock completely fits the edge of the oven.

7. Then adjust the position of the door handle to ensure that the door handle completely fits the edge of the oven.

8. Then adjust the gap between the door and the oven to ensure even gap.

9. Finally, push and pull the oven door several times by hand to ensure that the door is locked, not loose and without gaps.