1）Gauze filter is blocked up
2）Air aisle is blocked up.
3）Alarm threshold setting is not correct
1）Check the gauze filter is blocked up or not, clean or change the gauze filter according to the situation.
2） Check the air aisle is blocked up or not, clean the air aisle according to the situation.
3）Check the air aisle air flow resistance, check the air blower has running fault or not.
4）Check the alarm threshold setting is correct or not.