Reason:
1. Too much oil on filter
2. The air convection in the kitchen is too big or space sealing is too tight
3. Higher installation height
4. Exhaust pipe is too long or too more turns
5. Outdoor wind is too strong
Solution:
1. Clean filter
2. Reduce air convection and open doors and windows moderately
3. Adjust to appropriate height
4. Install according to the manual
5. Non technical faults