Fault
Type
Possible Cause
Solution
The fan does not
rotate.
The fan is
rotating
slowly.
Fan blade friction/
collision
Clear foreign matters or dirt in the fan if
necessary.
The active
temperature
management
function is enabled
(when the motor or
electronic system is
overheated).
Check whether the air circulation is normal.
Clear foreign matters if necessary.
The fan blade is blocked or polluted.
Check the air inlet temperature.
Check the installation space (wind speed on
the heat sink).
Excessivel
y small
airflow
volume
The fan is rotating
slowly.
Check the fan speed.
The air channel is
blocked.
Check whether the airflow is smooth (air
intake/exhaust valve and air filter).
The fan blade is blocked or polluted.
The pressure loss is
different from the
designed value.
Check the selected fan.
Vibration
Imbalance
Check whether the fan blades are
damaged, polluted, or frozen.
Abnormal
noise
Bearing damage or
wear
Replace the bearing.
Fan blade friction/
collision
Clear the foreign matters or dirt from the
fan.
The fan is operating
in the stall zone
(applicable to an
axial fan)
Check whether the airflow is smooth (air
intake/exhaust valve, and air filter).
The concentricity of
the air intake ring is
incorrect (applicable
to a centrifugal fan).
Observe the installation precautions.
Dangers Caused by Current
●
Electrical components can only be operated by professional electricians or
persons familiar with electricity, or under the supervision of an electrician.
●
Comply with five electrical safety regulations.
NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
6 System Operation and Maintenance
Issue 06 (2020-08-19)
Copyright © Huawei Technologies Co., Ltd.
128
