Elevator malfunctions include: 

1. The elevator cannot start: This may be caused by power failure, control system failure, motor failure, and other reasons. 

2. The elevator cannot stop: This may be caused by speed limiter failure, safety gear failure, emergency brake failure, and other reasons. 

3. The elevator door cannot be closed: This may be due to a malfunction in the door lock safety device, door operating system, or other reasons. 

4. The elevator door cannot be opened: This may be due to a malfunction in the door operating system, electrical failure, or other reasons. 

5. The elevator suddenly stops: This may be caused by power failure, control system failure, motor failure, and other reasons. 

6. Abnormal elevator running speed: This may be caused by speed limiter failure, safety clamp failure, motor failure, and other reasons. 

7. High noise during elevator operation: This may be caused by motor failure, wheel set failure, wire rope or chain wear, and other reasons. 

If the elevator malfunctions, it should be immediately stopped and the elevator maintenance personnel should be notified for repair. Before the maintenance personnel arrive, warning signs should be set up at the elevator entrance to remind others not to use the elevator. 

In short, elevators are important vertical transportation equipment that require regular maintenance and inspection to ensure their safety and reliability. At the same time, elevator users also need to comply with relevant safety regulations to ensure their own safety.