Maintenance
Service Manual
8.3 Maintenance method for common malfunction
1.The unit can not start up
Possible causes
Discriminating method
Troubleshooting
No power supply, or poor
connection for power plug
After energization, operation indicator isn’t bright
wait for power recovery. If not, check power
supply circuit and make sure the power plug is
connected well.
Poor connection between wiring
terminals
Power indicator is not on after the unit is
energized
Check the circuit according to wiring diagram
and connect wire properly; ensure each wiring
There is electric leakage in the
unit
Circuit breaker jump off immediately after the unit
is energized
Make sure the unit is properly grounded;
Make sure the wiring is correct;
Check if the insulating layer of wires inside the
unit and power cord is in good condition; if the
layer is broken, please replace it.
Placing position of water tank is
not correct. Water is removed or
the water is full.
\
Make sure the water tank is placed correctly.
2. Poor dehumidifying effect
Possible causes
Discriminating method
Troubleshooting
Set humidity is irrational
Observe the displayed set humidity
Adjust set humidity
Filter is blocked
& &
Placing position of water tank is
improper.
Check whether there’re obstacles around the
&
Make sure there’re no obstacles around the
Refrigerant is leaking
Air outlet temperature is lower than normal
temperature during dehumidifying period.
Find out the cause of leakage and solve the
problem; charge refrigerant
Malfunction of capillary
Air outlet temperature is lower than normal
temperature during dehumidifying period. If the
refrigerant isn’t leaking, some parts of capillary is
blocked.
Replace capillary
Malfunction of fan
Fan can’t operate.
Refer to point 3 of maintenance method for
details
Malfunction of compressor
Refer to point 4 of maintenance method for
details
3.Fan can’t operate
Possible causes
Discriminating method
Troubleshooting
Wrong wire connection, or poor
connection
Check the wiring status according to circuit
diagram
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
Needle stand of connection wire
between mainboard and display
board is loosened
Check if the needle stand is loosened
Fan capacitor is broken
Test the voltage between two ends of fan
capacitor with universal meter and the value is 0
Replace fan capacitor
Power supply voltage is too low
or too high
Test the power supply voltage with universal
meter and the value is too high or too low
Apply voltage regulator
Fan is broken
The above situation is normal but the fan does
not operate
Repair or replace the fan
