GREE ELECTRIC GDN20AQ-E4EBA1A User manual

Service Manual
GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI
Change for Life
Service Manual
Model:GDN20AQ-E4EBA1A
GDN24AQ-E4EBA1A
(Refrigerant R134a)

Service Manual
Table of Contents
Part Ⅰ: Technical Information............................................................ 1
1.Summary...................................................................................................... 1
2.Specications ........................................................................................... 2
3.Outline Dimension Diagram.............................................................. 3
4.Refrigerant System Diagram ............................................................ 4
5.Electrical Part............................................................................................ 5
5.1 Wiring Diagram ........................................................................................... 5
5.2 PCB Printed Diagram.................................................................................. 6
6.Function and Control............................................................................ 8
6.1 Control Panel Instruction............................................................................. 8
6.2 Introduction of Basic Mode Function......................................................... 10
Part Ⅱ: Maintenance ............................................................................ 11
7.Notes Maintenance .............................................................................. 11
8.Maintenance............................................................................................. 13
8.1 Error Code................................................................................................. 13
8.2 Malfunction Detection Flowchart............................................................... 14
8.3 Maintenance Method for Common Malfunction ........................................ 16
9.Exploded View and Parts List ........................................................ 18
10.Removal Procedure........................................................................... 20
Appendix:...................................................................................................... 27
Appendix 1: Reference Sheet of Celsius and Fahrenheit ............................... 27
Appendix 2: Resistance Table of Ambient Temperature Sensor ..................... 28
Appendix 3: Resistance Value Table of Humidity Sensor ............................... 33
Table of Contents

1
Technical Information
Service Manual
1.Summary
Part Ⅰ: Technical Information

2Technical Information
Service Manual
2.Specications
The above data is subject to change without notice; please refer to the nameplate of the unit.
Model GDN20AQ-E4EBA1A GDN24AQ-E4EBA1A
Product Code CK051021100 CK051021200
Power Supply
Rated Voltage V~ 220-240 220-240
Rated Frequency Hz 50 50
Phases 1 1
Rated Dehumidication Capacity L/h 0.48 0.52
Power Input W 260 280
Current Input A 1.3 1.3
Set Humidity Range % 35~80 35~80
Air Flow Volume(H/M/L) m3/h 185/165/145 185/165/145
Fan Motor Speed(H/M/L) r/min 1150/1050/980 1150/1050/980
Fan Motor Power Output W 8 8
Fan Motor RLA A 0.14 0.14
Fan Motor Capacitor μF 1.5 1.5
Fan Type Centrifugal Centrifugal
Fan Diameter Length(DXL) mm Φ180X62.5 Φ180X62.5
Throttling Method Capillary Capillary
Fuse Current A 3.15 3.15
Sound Pressure Level(H/M/L) dB (A) 48/46/44 48/46/44
Sound Power Level(H/M/L) dB (A) 58/56/54 58/56/54
Climate Type T1 T1
Isolation I I
Moisture Protection IPX0 IPX0
Permissible Excessive Operating Pressure for the
Discharge Side MPa 1.7 1.7
Permissible Excessive Operating Pressure for the
Suction Side MPa 0.6 0.6
Dimension (WXHXD) mm 351X492X260 351X492X260
Dimension of Carton Box(LXWXH) mm 404X326X515 404X326X515
Dimension of Package(LXWXH) mm 407X329X530 407X329X530
Application Area m228 34
Net Weight kg 15 15
Gross Weight kg 17 17
Refrigerant R134a R134a
Refrigerant Charge kg 0.13 0.2
Bucket Capacity L 3.6/4.2 3.6/4.2
Control Type Electronic Electronic
Evaporator
Evaporator Form Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Evaporator Pipe Diameter mm Φ7 Φ7
Evaporator Row-n Gap mm 2-1.4 2-1.4
Evaporator Coil Length (LXDXW) mm 245X25.4X190.5 245X25.4X190.5
Condenser
Condenser Form Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ5 Φ5
Condenser Rows-n Gap mm 2-1.4 3-1.4
Condenser Coil Length (LXDXW) mm 245X22.8X190.5 245X34.2X190.5
Compressor
Compressor Manufacturer RECHI PRECISION CO.,LTD. RECHI PRECISION CO.,LTD.
Compressor Model 39E0G3HR&F^YA 39E073HR&F^YA
Compressor Type Rotary Rotary
Compressor Power Input W 265 300
Compressor Overload Protector UP3-016 UP3-017
Compressor LRA. A 5.5 5.5
Compressor RLA A 1.2 1.4

3
Technical Information
Service Manual
3.Outline Dimension Diagram
unit:mm
492 521
260
351

4Technical Information
Service Manual
4.Refrigerant System Diagram
air in
evaporator
capillary
condenser
fan motor
air out
compressor
Dehumidifying principle of dehumidier:
When temperature is decreased to the temperature point of dew, water vapor in humid air will condensate. Dehumidier is
dehumidifying the air by using this principle.
During operation of the system, air will pass through evaporator and condenser in turn and then be discharged due to centrifugal
blade. When the air is passing through evaporator, refrigerant will absorb the heat in air to let its temperature decrease to the
temperature point of dew, water vapor in air will condensate. Condensate water comes into water tank through water tray, or is
discharged directly through drainage hose. The saturated low-temperature air passed through the evaporator will absorb the heat
when owing along the condenser, and then become the dry air. Under normal condition, the nearby air will become warm during
operation of dehumidier.

5
Technical Information
Service Manual
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green COMP Compressor
YE Yellow BN Brown Grounding wire
RD Red BU Blue / /
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
5.Electrical Part
5.1 Wiring Diagram
●Instruction
These circuit diagrames are subject to change without notice ,please refer to the one supplied with the unit.
AC-L
YEGN
0
TUBE
TEMP.SENSOR
SENSOR
C1
C
RD
YEGN
BU
BN
CN1
HUMIDITY
TUBE
AP2
CN4
CN1
FAN
AP1
L
N
COMP.
M1
LIQUID LEVEL SWITCH
N1
PE
RT1
POWER
FAN
MOTOR
PE
YEGN
COMP.
PE
COMP-L
SA
COM
N0
BU
BN
CN2
CN2
AP3
CN2
C2
YE
BU
BU
R(M)
S
PE
PE
YEGN

6Technical Information
Service Manual
Silk Screen on Main Board
5.2 PCB Printed Diagram
● Top view
● Bottom view
No. Name No. Name
1 Interface of water level switch of watertank 4 Interface of fan motor
2 Interface of display board 5 Interface of neutral wire
3 Fuse 6 Compressor relay
1 2
3
4
5
6

7
Technical Information
Service Manual
Silk Screen on Display Board1
● Top view
● Bottom view
1 Buzzer 2 Needle stand of pipe temperature sensor 3Dual-8 digital display tube
4Connection wire of breathing
light board 5 Connection wire of board6
Needle stand of humidity and
ambient temperature sensor
7 Power supply indicator 8 On/off button 9Continuous button
10 Mode button 11 "+" button 12 "-" button
13 Fan speed button 14 Timer button 15 Filter button
1
234567
891011121415 13

8Technical Information
Service Manual
6.Function and Control
6.1 Control Panel Instruction
74 3 82561
clean the lter
indicator light
Bucket full light
indicates bucket
needs to be emptied
or it is not in the
proper place
sleeping
space
mode on
indicator
light
timer on
indicator
light
lock on
indicator
light
high, mid
and low fan
indicator light
living space
mode on
indicator
light
power on
indicator
light
continuous operation
on indicator light
basement
mode on
indicator
light
Notes:
● Water bucket must be correctly installed for the dehumidier to operate.
● Do not remove the bucket while unit is in operation.
● If you want to use drain hose to drain water away, please install the hose according to section "Drainage method".
● Each time pressing the effective button on the control panel will give out a "beep" sound.
● When power is connected, power indicator on the control panel will be on and dehumidier gives out a "beep" sound simultaneously.
Basic Functions of the Buttons
1POWER Button
Press this button to turn on/off dehumidier.
1
+/- Button
Under free drying mode press these buttons to adjust set humidity. Invalid under other modes.
● Pressing + button will increase humidity while pressing - button will decrease humidity. The display range of humidity is 35%~80%.
Each pressing will increase/decrease humidity by 5%.
● When setting Timer On or Timer Off, press these buttons to adjust time. For specific details, please refer to Timer Button
description below.
● When unit is in operation, holding + and - button simultaneously for 3s can lock buttons. If this function is turned on, Button Locked
Indicator will be on and display window shows LC, which will blink for 3 times. Then ambi ent humidity is displayed again. To turn off
this function, hold + and - button simultaneously for 3s and the indicator will be off.
2
Pressing this button can set fan speed circularly as: High, Medium, Low. Corresponding indicator will be on for each fan speed.
FAN SPEED Button
3
Press this button to set Timer On or Timer Off (Timing range 0.5~24h).
● Set Timer Off:
When unit is on, press this button and the Timer Indicator will be on while display window will show the timing gure. Pressing + or
- button each time will increase or decrease the time by 0.5h or 1h (When gure varies within10h, pressing +/- button will increase/
decrease the time by 0.5h; when gure varies from 10h to 24h, pressing +/- button will increase/decrease the time by 1h). When time
is set, wait for 5s or press this button to turn this function on. Timing Indicator will be on.
● Cancel Timer Off:
Under the condition that this function is turned on, press this button to cancel it. Timing Indicator will be off.
TIMER Button
4

9
Technical Information
Service Manual
Other Instructions
● Set Timer On:
When unit is off, press this button and the Timer Indicator will be on while display window will show the timing gure. Pressing + or
- button each time will increase or decrease the time by 0.5h or 1h (When gure varies within 10h, pressing +/- button will increase/
decrease the time by 0.5h; when gure varies from 10h to 24h, pressing +/- button will increase/decrease the time by 1h). When time
is set, wait for 5s or press this button to turn this function on. Timing Indicator will be on.
● Cancel Timer On:
Under the condition that this function is turned on, press this button to cancel it. Timing Indicator will be off.
● Timing range: 0.5~24 hours.
Press this button to select different kinds of working mode. After each pres-
sing of this button, mode will switch among free drying, sleeping space, living space, basement and continuous drying modes, and
the corresponding mode indicator will ON. When free drying, all mode indicators are OFF.
MODE Button
5
Press this button to turn off Filter Cleaning Indicator. (When dehumidier has
been operating for 250 hours, Filter Cleaning Indicator will be lit up to remind
user of lter cleaning.)
Press this button to set continuous dehumidify.
Note: When selecting CO mode, drain hose has to be installed. Otherwise, unit will stop when water bucket is full.
Continuous button
FILTER Button
6
7
1. Alarm Warning
If bucket is full or not locked into place for over 3min, buzzer will go off for 10s to remind you to empty bucket or put it back into the
correct place.
2. Auto Stop
When bucket is full, removed or not placed correctly or the humidity is 5%lower than the set humidity, unit will automatically stop.
3. Memory Function
If power is lost, all of the control settings are remembered. So when power is restored, the unit will start back up in the settings it was
in when power was lost.
4. Bucket full light
This indicates that bucket is full or removed or not placed correctly.
5. Clean the Filter On indicator light
When dehumidier has been operating for 250 hours, Filter Cleaning Indicator will be lit up to remind user of lter cleaning.

10 Technical Information
Service Manual
6.2 Introduction of Basic Mode Function
1. Basic Function
(1) Free drying
a. When set humidity ≤ ambient humidity -5%, compressor starts working and fan motor works at set fan speed.
b. When set humidity ≥ ambient humidity +5%, compressor stops and fan motor stops in 3 min’s delay at set fan speed.
c. When ambient humidity -5% < set humidity < ambient humidity +5%, if compressor is working, it works according to condition a; if
compressor is stopped, it works according to condition b; if unit is in condition c when started up, compressor will not work and fan
motor will stop in 3 min’s delay.
(2) Continuous mode
This mode is not related to set humidity. Compressor starts to work and fan motor works at high speed. User may set the fan speed
during operation.
(3) Basement mode
Set humidity is 45% and fan motor runs at high speed. Unit starts drying. User may set the fan speed during operation. The working
status of compressor and fan motor is the same as described in condition a, b, c of free mode.
(4) Living Room mode
Set humidity is 50% and fan motor runs at medium speed. Unit starts drying. User may set the fan speed during operation. The working
status of compressor and fan motor is the same as described in condition a, b, c of free mode.
(5) Bedroom mode
Set humidity is 55% and fan motor runs at low speed. Unit starts drying. User may set the fan speed during operation. The working
status of compressor and fan motor is the same as described in condition a, b, c of free mode.
2. Protection Function
(1) Working temperature range
a. Detect the unit after energized, when 2oC ≤ Tamb. ≤45oC, the unit is running normally; when Tamb. < 2oCor Tamb. > 45oC, the
compressor stops, and fan will run with the detected temperature humidity;
b. During operation, when Tamb. < 2oC or Tamb. > 45oC, the compressor stops, and fan will run with the detected temperature
humidity; when 2oC ≤ Tamb. ≤ 45oC, the compressor will be started up.
(2) Compressor Protection
a. After energization, under any situation and after compressor stops, it will restart 3min delay at least.
b. Under operation state except temperature sensor malfunction, on/off button, water-blow protection, after compressor starts up, it will
stop after it runs for 3min at least.
(3) Detection for temperature sensor malfunction (Temperature sensor malfunction is AD value≤5 or 250≤AD value)
a. When the unit is energized, it is detected that the ambient temperature sensor is open or short circuit for 5s, compressor and fan
stops, LED indicator is off, buttons are invalid, and nixie tube displays “F1”.
b. It is detected that the pipe temperature sensor is open or short circuit for 5s, compressor and fan stops, LED indicator is off, buttons
are invalid, and nixie tube displays “F2”.
c. If humidity sensor short circuit is detected for continuously 5 seconds, compressor and fan motor will stop and LED lights go off.
Buttons will be null and dual-8 displays L1.
d. If there are multiple malfunctions, malfunction codes will be displayed in turn.
(4) Water blow protection (off switch)
a. The water blow protection will be occurred when the water level of water tank is exceeded. After water blow protection, compressor
stops and fan stops after 3mins. If water blow protection occurred for 3min, the buzzer will stop after it gives out a beep for 10s,
indicator of water blow will blinks and all the buttons are invalid. When the water level or assembly of water tank resume to normal,
signal of water blow protection will cancelled, indicator is off, buzzer stops to give out a beep and resume to normal operation state.
b. When the unit is off, water blow protection is occurred, water blow indicator blinks, compressor and fan stops, all the buttons are
invalid except on/off buttons. When the unit is on, water blow indicator blinks, buzzer will not give out a beep, compressor and fan
stops.
3. Other Functions
(1) Power-off memory
Upon power failure, the unit after power recovery will automatically start to run according to memory content.
(2) Nixie tube display
When the unit is running, it will display current humidity, preset temperature will be adjusted by “+” or “-”, it will resume current humidity
after the set is nished for 5s.
(3) Filter alarm function
a. After fan runs for 250s totally, lter lamp is on to remind customer clean lter.
b. When the unit is off, the lter lamp is off; the lter time can not be clearance when the unit is off.

11
Maintenance
Service Manual
7.Notes Maintenance
Electrical Safety Precautions:
Safety Precautions:
Important!
Please read the safety precautions carefully
before maintenance：
The following contents are very important for installation
and maintenance.
Please follow the instructions below.
●The maintenance must accord with the instructions.
●Comply with all national electrical codes and local
electrical codes.
●Pay attention to the warnings and cautions in this
manual.
●Be caution during maintenance. Prohibit incorrect
operation to prevent electric shock and other accidents.
1. Cut off the power supply before maintenance.
2. Specialized circuit must be applied; prohibit sharing the
same circuit with other electric appliances; protection switch
must be installed.
3.Have the unit adequately grounded. The grounding wire can’t
be used for other purposes.
4. The live wire, neutral wire and grounding wire of power sup-
ply must be corresponding to the live wire, neutral wire and
grounding wire of the dehumidier.
5. The power cord can’t be pressed by hard objects.
6. If the power cord or connection wire is not long enough,
please get the specialized power cord or connection wire from
the manufacture or distributor. Prohibit prolong the wire by
yourself.
7. Replace the fuse with a new one of the same specication if
it is burnt down; don’t replace it with a cooper wire or conduct-
ing wire.
8. Use the power supply with same voltage and frequency as
shown in rating label.
9. Do not pull out the power plug when the unit is operating to
avoid damaging the circuit.
10. Do not place anything at the top of dehumidier; ensure the
air outlet or air inlet is not blocked; do not use the unit near
wall and curtain.
11. Do not use heating equipment around the unit.
1. Avoid contact between refrigerant and re as it generates
poisonous gas. Recycle the refrigerant inside the unit
completely before welding pipes.
2. Apply specified refrigerant only. Never have it mixed
with any other refrigerant. Never have air remain in the
refrigerant line as it may lead to rupture or other hazards.
3.If refrigerant is leaking seriously, it may cause suffocation
or explosion. When using the combustible refrigerant,
please put the unit at ventilated place.
4. Never touch the refrigerant piping or compressor without
wearing glove to avoid scald or frostbite.
Warnings
Refrigerant Safety Precautions:
Improper installation may lead to re hazard explosion,
electric shock or injury.
Part Ⅱ: Maintenance

12 Maintenance
Service Manual
1. Nip the groove at both sides of bucket and pull the bucket out by the arrow shown direction.(As shown in Fig.a)
2.Take out accessory box. (There are 4 castors,As shown in Fig.b)
3.Ret the bucket by the arrow shown direction, then the unit is ready to be electried and turned on. (As shown in Fig.c)
4.Take out 4 castors from accessory box.
5.Tilt the dehumidier no more than 45°. Aim the shaft of castor at the installation hole on chassis, and then forcibly push the
castor upward to let the locating ring on the shaft of castor stick together with the side face of installation hole. (refer to Fig.d)
6.Install the 4 caster wheels on the dehumidier.
NOTE:
1. Keep the dehumidier balance during installation incase the dehumidier falls.
2. Four caster wheels must be installed well before operating the unit.
Installation of caster whell
Fig.a Fig.b
Fig.d
Fig.c
Bucket
accessory box
locating ring on
the shaft of castor
a ≤ 45°

13
Maintenance
Service Manual
No. Malfunction
Name Nixie tube display Unit status Possible Causes
1
Malfunction of
ambient temp.
sensor
F1
The compressor and fan
stop; buttons are invalid
1. The wiring terminal between ambient temperature
sensor and main board is loosened or poorly
contacted;
2. There’s short circuit due to trip-over of the parts on
controller;
3. Ambient temperature sensor is damaged (Please
check it by referring to the resistance table for
temperature sensor);
4. Main board is broken.
2
Malfunction
of tube temp.
sensor
F2
1. The wiring terminal between evaporator temperature
sensor and main board is loosened or poorly
contacted;
2. There’s short circuit due to the trip-over of the parts
on controller;
3. Evaporator temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor);
4. Main board is broken.
3
Malfunction
of humidity
sensor
L1
1. Humidity sensor is short-circuit;
2. Humidity sensor is broken;
3. Display board is broken.
4
Freon-lacking
protection
F0
1. Refrigerant is leaking;
2. System is blocked.
5
High
temperature
overload
protection
H3
1. Ambient operation condition is bad;
2. The evaporator with lth;
3. The system is abnormal.
8.Maintenance
8.1 Error Code

14 Maintenance
Service Manual
Start
Insert the temperature
sensor tightly
yes
M alfunction is
eliminated.
Make the parts upright
yes
Malfunction is
eliminated.
Replace the controller with
one of the same model
End
no
no
no
no
yes
yes
Malfunction is
removed.
no
yes
yes
no
Is the wiring
terminal between temperature
sensor and the controller loosened or
poor ly contacted?
Is there short circuit due to trip over
of the par ts?
Is the temperature
sensor normal according to the
Resistance Table?
Replace it with a
temperature sensor
of the same model
9.3.1 F1/F2 Malfunction
1. Malfunction of temperature sensor F1, F2
8.2 Malfunction Detection Flowchart

15
Maintenance
Service Manual
2.Malfunction of humidity sensor L1
Trouble shooting for malfunction
of humidity sensor
Humidity sensor is not
connected well with mainboard yes
yes
yes
yes
yes
yes
no
no
no
no
no
no
End
check the connection
Is malfunction
eliminated?
Is malfunction
Is malfunction
eliminated?
eliminated?
Replace the display board
with the same model
Replace the humidity
sensor board
Is the humidity
sensor normal according to the
Resistance Table?
Eliminate short
circuit phenomenon
The foot of humidity sensor
is short-circuit or the display board
is short circuit

16 Maintenance
Service Manual
8.3 Maintenance Method for Common Malfunction
1.The Unit Can’t Start Up
Possible causes Discriminating method (dehumidier status) Troubleshooting
No power supply, or poor
connection for power plug
After energization, operation indicator isn’t bright
and the buzzer can't give out sound
Conrm 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.
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
terminal contact rmly
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.
Wall-full indicator ashes. Make sure the water tank is placed correctly.
2. Poor Dehumidifying Effect
Possible causes Discriminating method (dehumidier status) Troubleshooting
Set humidity is irrational Observe the displayed set humidity Adjust set humidity
Filter is blocked Check the lter to see it's blocked Clean the lter
Placing position of water tank is
improper.
Check whether there’re obstacles around the
dehumidier blocked the air outlet.
Make sure there’re no obstacles around the
dehumidiers.
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 Compressor can't operate Refer to point 4 of maintenance method for
details
3.Fan Can’t Operate
Possible causes Discriminating method (dehumidier status) 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
rmly
Needle stand of connection wire
between mainboard and display
board is loosened
Check if the needle stand is loosened Reinsert the needle stand rmly
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

17
Maintenance
Service Manual
6. Abnormal Sounds and Vibration
Possible causes Discriminating method (dehumidier status) Troubleshooting
There is abnormal sound in some
parts when just turning on or
turning off the unit
There's the sound of "PAPA" Normal phenomenon. Abnormal sound will
disappear after a few minutes.
There is abnormal sound of
refrigerant owing when just
turning on or turning off the unit
Water-running sound can be heard Normal phenomenon. Abnormal sound will
disappear after a few minutes.
There is touching sound of foreign
objects or parts inside the unit The unit gives out abnormal sound
Take out the foreign objects; adjust the
position of each part inside the unit; tighten the
connection screws; apply some damping gum
on the touching parts
Abnormal shake of compressor Outdoor unit gives out abnormal sound Adjust the support foot mat of compressor,
tighten the bolts
Abnormal sound inside the
compressor Abnormal sound inside the compressor
If add too much refrigerant during maintenance,
please reduce refrigerant properly. Replace
compressor for other circumstances.
5. Water Leakage
Possible causes Discriminating method (dehumidier status) Troubleshooting
Drainage pipe hasn’t been
installed correctly. Water is coming out from indoors. Eliminate the blocking objects inside the drainage channel.
Possible causes Discriminating method (dehumidier status) 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
rmly
Compressor relay on the
mainboard is broken or the
compressor needle stand is
loosened
Check if the relay is sucked in cooling mode Replace the mainboard with the same model
Capacity of compressor is
damaged
After tuning on the unit, the unit can’t dehumidify.
Use universal meter to measure the resistance
value of two contact points of capacitor. If the
resistance value is too big or o, the capacitor is
damaged.
Replace the compressor
Power voltage is a little low or
high
After turning on the unit, dehumidifying effect is
poor or compressor is turned on or off frequently.
Use universal meter to measure the power supply
voltage directly
The uctuation of voltage is 10% rated power.
If the power is too low or too high, you are
suggested to equip wit voltage regulator.
Coil of compressor is burnt out
There is no dehumidifying effect after turning on
the unit; test the resistance of the wiring poles of
compressor with universal meter; if the resistance
is innite or zero, it means it is broken
Repair or replace compressor
Cylinder of compressor is blocked
The dehumidifying effect is poor after turning on
the unit; the noise of compressor is big and the
compressor is hot
Repair or replace compressor
4. Compressor Can't Operate

18 Maintenance
Service Manual
9.Exploded View and Parts List