Maintenance Method For Common Malfunction - Gree GDN12AJ-K4EBC1A Service Manual

8.3 Maintenance Method for Common Malfunction

1.The Unit Can't Start Up
Possible causes
No power supply, or poor
connection for power plug
Poor connection between wiring
terminals
There is electric leakage in the
unit
Placing position of water tank is
not correct. Water is removed or
the water is full.
2. Poor Dehumidifying Effect
Possible causes
Set humidity is irrational
Filter is blocked
Placing position of water tank is
improper.
Refrigerant is leaking
Malfunction of capillary
Malfunction of fan
Malfunction of compressor
3.Fan Can't Operate
Possible causes
Wrong wire connection, or poor
connection
Needle stand of connection wire
between mainboard and display
board is loosened
Fan capacitor is broken
Power supply voltage is too low
or too high
Fan is broken
14
Discriminating method (dehumidifier status)
After energization, operation indicator isn't bright
and the buzzer can't give out sound
Power indicator is not on after the unit is
energized
Circuit breaker jump off immediately after the unit
is energized
Wall-full indicator flashes.
Discriminating method (dehumidifier status)
Observe the displayed set humidity
Check the filter to see it's blocked
Check whether there're obstacles around the
dehumidifier blocked the air outlet.
Air outlet temperature is lower than normal
temperature during dehumidifying period.
Air outlet temperature is lower than normal
temperature during dehumidifying period. If the
refrigerant isn't leaking, some parts of capillary is
blocked.
Fan can't operate.
Compressor can't operate
Discriminating method (dehumidifier status)
Check the wiring status according to circuit
diagram
Check if the needle stand is loosened
Test the voltage between two ends of fan
capacitor with universal meter and the value is 0
Test the power supply voltage with universal
meter and the value is too high or too low
The above situation is normal but the fan does
not operate
Troubleshooting
Confirm whether it's due to power failure. If yes,
wait for power recovery. If not, check power
supply circuit and make sure the power plug is
connected well.
Check the circuit according to wiring diagram
and connect wire properly; ensure each wiring
terminal contact firmly
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.
Make sure the water tank is placed correctly.
Troubleshooting
Adjust set humidity
Clean the filter
Make sure there're no obstacles around the
dehumidifiers.
Find out the cause of leakage and solve the
problem; charge refrigerant
Replace capillary
Refer to point 3 of maintenance method for
details
Refer to point 4 of maintenance method for
details
Troubleshooting
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly
Reinsert the needle stand firmly
Replace fan capacitor
Apply voltage regulator
Repair or replace the fan
Service Manual
Maintenance