Huawei NetCol5000-A-035 - Page 192

NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm)
6 System Operation and Maintenance
Issue 13 (2019-01-15)
Copyright © Huawei Technologies Co., Ltd.
183
Symptom
Possible Cause
Solution
The superheat degree that is
set with the thermostatic
expansion valve is
inappropriate.
Adjust the thermostatic
expansion valve to an
optimal degree.
The sensing bulb is
disconnected from the
thermostatic expansion
valve.
Check whether the
thermometer bulb is
disconnected from the
thermostatic expansion
valve.
The external excess pressure
is too high, and air
decreases.
Check whether the air duct
is blocked.
The condensing pressure is
too low.
Check the condenser.
Compressor generate
excessive noises.
Liquid returns in a
compressor.
Check whether the oil
temperature and exhaust
temperature are within a
normal range.
The lubricant is insufficient.
Add the lubricant.
The transport sheet metal is
not removed from a
compressor.
Remove the sheet metal.
An indoor fan fails to start.
Either the main circuit
breaker or the indoor fan
circuit breaker is not
switched on.
Check the circuit breaker
status.
An indoor fan contactor has
an abnormal pickup.
Check whether the main
control board sends signals
to the indoor fan contactor
and whether the contactor is
damaged.
An indoor fan is damaged.
Replace the indoor fan.
The heating function is
unavailable.
The electric heater
temperature switch is being
protected.
Check whether the
temperature switch is faulty.
Replace the faulty switch.
The electric heater circuit
breaker is off.
Check the electric heater
circuit breaker status.
An electric heater is burnt
out.
Disconnect the power
supply and check whether
the electric heater is
damaged by checking the
electric heater resistance
properties with an
ohmmeter.