1. Too Dirty
2. Deformed or misaligned contact springs.
3. Bent cell plates
4. Voltage is too low
Most of the fume filtration are electrostatic precipitator, which use high-voltage static electricity in the filter cell to form an electrostatic field to ionize and adsorb oil fume particles. If the external voltage is too low, a high-voltage electrostatic field cannot be formed at the electric field, so the oil fume cannot be purified, and the purification has almost no effect. If this happens, you may need to:
1: Check the insulators on door and filter cells. Replace the cracked one or broken one.
2: Check the power pack output voltage and adjust it to right one.