Reason:
1. The door was unlocked.
2. Bad contact with lamp tube.
3. Thermostat damaged.
4. Fuse blow.
5. Tube damage.
6. Door switch damaged.
Solution:
1. Instruct users to close the door tightly.
2. The lamp tube is well installed.
3. Change the thermostat damaged.
4. Replace the fuse.
5. Replace the light wave sterilization lamp.
6. Replace the door switch.