1. Water leakage
(1) overflow of drip tray: the drain port or drain pipe is blocked and dredged by suction, ventilation, blowing and flushing; If water cannot be discharged or the drainage is not smooth, increase the slope or diameter of the drainage pipe
(2) Inclined drain pan: adjust the drain pan to make the drain outlet lowest
(3) The vent valve is not closed: it is closed
(4) each pipe joint is not tightly connected: the connection is tight and tight 2. A foreign body blows out
(1) filter screen is damaged: replace it
(2) Too much dust accumulated in fan coil units or air ducts: clean
(3) Rust on the blade surface of fan coil unit: replace the fan
(4) Oxidation of fan coil fins: replace the coil
(5) Damage of insulation materials in fan coil units or air ducts: repair or replace

3. Condensation of fan coil unit shell
(1) the thermal insulation material pasted inside the fan coil unit is damaged or separated from the inner wall: repair or paste it well
(2) Damage and air leakage of fan coil casing: repair 4. Poor discharge of condensed water
(1) the horizontal slope of the external pipeline is too small: the adjusted slope is ≥0.8%
(2) External pipeline blockage: dredge

5. Dew on drain pan
The insulation layer at the bottom of the drain pan is damaged or separated from the bottom of the pan: repair or paste it well