Midea M Series User manual

Service Manual
Washing machine
Automatic washer
M Series Top-load
Note：
Before service the unit, please read this manual first.
Contact with your service center if meet problem

1 PRECAUTION………………….………………..…………………………………………………….
1.1 Safety Precautions
1.2 Servicing Precaution
1.3 CAUTIONS FOR SAFETY
2 Factory Pattern Detection ………………….…………………………………………………….
3 UNPACKING WAYS OF MAIN PARTS…………………………………………………………...
4 MALFUNCTIONS CODES AND EXPLANATIONS …………………………………
5 TROUBLESHOOTING…………………………………………………………………………………
5.1 water inlet process
5.2 Wash process
5.3 Soak process
5.4 Drain process
5.5 Spin process
5.6Adjustment of imbalance
6 CHECK POINT OF CIRCUIT ……………………………………………………………………..
7 SERVICE TOOLS……..……………….....................................................................................
8 APPENDIX……………………………………………………………………………………………….
Contents
2

1 Precaution
When performing troubleshooting and part replacement during
servicing, note the following safety precautions:
§1.1 Safety Precautions
1-1-1. Use Genuine Parts
The components of the washing machine have safety features such as non-
combustibility and voltage withstanding. Therefore, always use the same
part as suggested by the maker. In particular, be sure to use only
designated parts in case of major safety parts identified by the marker.
1-1-2. Grounding
Connect the grounding wire to the shell plate, and bury it under at least
25cm of earth : alternatively, connect the ground wire to the appropriate
pin on a properly grounded power receptacle. Never connect the wire to a
telephone line, lightning rod, or gas pipe.
§1.2 Servicing Precautions
1-2-1. Observe Warnings
Be sure to follow special warning and precautions that are described on
part labels and in the owner's manual.
1-2-2. Parts Assembly and Wiring
Be sure to use insulation material (such as tube and tape). And be sure to
restore all parts and wires to their original position. Take special care to
avoid contact with sharp edges.
1-2-3. Perform Safety Checks after Servicing
After servicing, check to see that the screws, parts, and wiring are restored
to their original positions, and
check the insulation between the external metals and the socket plug. In
addition, place the washing machine
in a level position (less than 1(one) degree) to prevent vibration and noise
during operations.
1-2-4. Insulation Checks
Pull out the plug from the power receptacle, pour water into the spin tub,
and then set the timer. Check to see
that the resistance insulation between the terminals of the plug and the
externally exposed metal is greater than 1M• .
Note :When it is impossible to perform insulation check with a 500V
insulation resistance tester, use other
testers for inspection.
3

1.3 CAUTIONS FOR SAFETY
Symbol
Meaning
WARNING
Indicates possibility of death or serious injury of a repair technician
and a person nearby through the misconducted work, or of a user
by a defect of the
product after the work performed by the technician.
CAUTION
Indicates possibility of injury or physical damages* of a repair
technician and a person nearby through the misconducted work, or
of a user by a defect of the product after the work performed by the
technician.
Graphic Symbol
Meaning
ELECTRIC
SHOCK
• indicates a caution (including a warning).
Specific instruction is followed by a graphic or characters in or near
Symbol left warns an electric shock.
DO NOT
DISASSEMBLE
• indicates prohibition (act must not be conducted).
Specific instruction is followed by a graphic or characters in or near.
Symbol left warns not to disassemble.
UNPLUG
POWER
• indicates forcing (act must be conducted).
Specific instruction is followed by a graphic or characters in or near.
Symbol left warns to unplug the power cord.
•Please observe the following notes for safety.
•The symbols indicate as follows.
4

•Please observe the following notes for safety.
•The symbols indicate as follows.
WARNING
OUT OF CHILD
• Advise the customer to keep children out of the work place.
Children may be injured with a tool or a disassembled part.
UNPLUG POWER
• Unplug power cord for the work such as disassembling which
is not unnecessary to power on . Do not hold the plug by a wet
hand.
Failing to unplug may cause an electric shock.
USE
REPAIR PARTS
• Use the specified repair parts when repairing the product.
Otherwise, a malfunction or a defect may occur.
Also, a short circuit, ignition or other danger to the customer
may occur.
CHECK
INSULATION
RESISTANCE
• After repair, measure insulation resistance between the
charging part (power cord plug) and the non
-
charging metallic
part (ground) with an insulation resistance meter (500V). The
resistance shall be 10M• or more.
Failing to check the insulation resistance may cause a short
circuit, electric
shock or other diseases to the customer.
DO NOT MODIFY
• Do not modify the product.
An electric shock or ignition may occur.
DO NOT
DISASSEMBLE AND
REPAIR
• Only a repair technician can disassemble and repair.
An electric shock, ignition or malfunction may cause injury.
1.3 CAUTIONS FOR SAFETY
5

WARNING
USE EXCLUSIVE
SOCKET
• Use an exclusive A socket for the washing machine.
Otherwise, an electric shock or ignition may cause. Sharing the
same socket
with other instrument causes heating of a branch socket and
result in a fire.
CONNECT
GROUNDING WIRE
• Unplug power cord for the work such as disassembling which
is not unnecessary to power on . Do not hold the plug by a wet
hand.
Failing to unplug may cause an electric shock.
CONNECT
GROUNDING WIRE
• Connect the grounding wire.
Failing to do so may cause an electric shock when a short
circuit occurs.
Consult an electric work shop or a sales shop.
DO NOT USE WET
PLACE
• Do not install in a bath room or a place exposed to wind or
rain.
An electric shock or a short circuit may cause a fire.
DO NOT SPLASH
WATER
• Do not pour or immerse electrical parts into water or liquid
solution.
An electric shock or ignition may occur.
REMOVE DUST
• Wipe off dust adhered to the plug of power cord.
Dust may cause a fire.
6
1.3 CAUTIONS FOR SAFETY

WARNING
AVOID
INFLAMMABLE
• Do not put inflammable into the washing tub.
Do not put cloths stained with kerosene, gasoline, benzene,
thinner, alcohol,
etc. lt may cause a fire or explosion.
CONNECT
GROUNDING WIRE
• Do not touch the laundry before the spin basket stops
completely.
The laundry entangles your hand causing an injury even if the
basket rotates
slowly. Pay special attention to children.
CAUTION
INSTALL
CAREFULLY
• Ask an electric work shop to install the product.
Install the product securely and safely according to the
electrical equipment
technical standard and the wiring standard.
Incorrect work causes an electric shock and a fire.
DO NOT PULL
• Do not pull the power cord when unplugging.
Hold the power plug to unplug.
An electric shock or short circuit may cause a fire.
DANGER HAND
• Do not insert your hand under the washing machine during
operation.
There is a rotary part under the machine which may cause an
injury.
WATER LEAKAGE
• Before starting washing, open the faucet and check water
supply hose joint
which shall not be loosened for no water leaks.
The loose screw or hose joint may cause water leakage
resulting in an
unexpected damage.
7
1.3 CAUTIONS FOR SAFETY

2 Factory Pattern Detection
When the machine work normal,we can check as follow :
Press water level key and power off key ,enter into whole show model
（C1）, all light of, the PCB show ;
Press water level key again, enter into wash model （C2）, Impeller turn;
Press water level key again, enter into spin model, Retractor work,start
drain （C3）, Tub start turn;
Press water level key again, enter into whole show model again;
Such circulate.
3 UNPACKING WAYS OF MAIN PARTS
ITEM PICTURE HOW TO DISASSEMBLE
1.BACK COVER Use cross
screwdriver
①
Unscrew the screws on
the back cover ( Red circle
part) and then take out the
rear cover.
①Unscrew the earth screws
tomake
the earth wire
subassembly and cabinet
separate.
②
Unscrew the capacitor
screws,take
down capacitor
catch.
③
Pull out the air pipe to
make the air pipe and
suspend poles separate
(When you install the air
pipe, you remember to
coat adhesive for
preventing leakage
2. The earth
screws,capacitor
screws,
and then pull out the air
pipe.( make the air pipe
and suspend poles
separate)Use cross
screwdriver

9
ITEM PICTURE
HOW TO DISASSEMBLE
3 Pull the insulating bag
and then remove the
wire connector.
Use vice
①
Put the Nylon cable
ties, pull the insulating
bag
②
Remove the crimp
terminal by pliers .
4 Top cover
Use cross screwdriver
①Unscrew the screws on
the Top
cover（normally
2 sides 2 back. It varies
according to different
designs
）
②
Take down the top
cover, and put it in the
right place ( avoid to
scratch the top cover)
5 Remove the PCB
Use cross screwdriver
①
Unscrew the controller
board screws, pull out the
controller board
terminals(When you plug
wire and connect wires,
you must insert terminals
to
the roots for not easily
pulling.)
②
Take down the
controller board and the
front control panel
separately
3 UNPACKING WAYS OF MAIN PARTS

10
ITEM PICTURE HOW TO DISASSEMBLE
6 Take down the back
control panel, cover
switch, water inlet
valve,water
level sensor,
and internal wire
subassembly
Use cross screwdriver
and vice
①Remove the back control
panel screws, and take out
the back control panel.
②Remove the cover switch
screws.
③Take down the water inlet
valve.
④
Remove the water level
sensor Screws.
⑤Take out the internal wire
Subassembly
.
7 Door Lid
Use cross screwdriver
①
First remove the door
bolt.
②
Take down the lid
③
Take out the spring
8 outer tub cover
Use cross screwdriver
Unscrew the outer tub
cover screws, and take out
the outer tub cover
9 Impeller
Use cross screwdriver
Unscrew the impeller
screws, and take out the
impeller
10 Spin tub
use sleeve
Unscrew the spin tub bolts
and take out the spin tub
cover
3 UNPACKING WAYS OF MAIN PARTS

11
ITEM PICTURE HOW TO DISASSEMBLE
11 Out tub
①
Firstly make suspension
rods and the outer tub
subassembly
separately.（
Remember
the rods
installing order.
）
②
Take out the out tub
12 Parts attached on
the out tub
Use cross
screwdriver and
Sleeve
①Remove the motor screws,
and take out motor.
②
Remove the bracket
screws, and take out
bracket.
③
Remove the clutch body
subassembly screws, and
take out clutch body
subassembly.
④Firstly make retractor and
the clutch body
subassembly separately.,
remove retractor screws,
and take out retractor
13 Base plate
Use cross
screwdriver
①
Remove the base plate
screws, and take out the
base plate.
3 UNPACKING WAYS OF MAIN PARTS

4 MALFUNCTIONS CODES AND EXPLANATIONS
12
DISPLAY CHECK
Washing machine won’t work
• Is the water tap opened?
• Is the washer plugged in?
• Is the power cut off?
• Is there enough water?
E1
--Water is not supplied
• Is the water tap opened?
• Is the water cut off?
• Is the water supply hose or hose
connection clogged?
• Is the water tap frozen?
If the water supply is not finished in
30mins after the water supply has
started, the buzzer rings and “E1” is
displayed on the indicator.
E2
--Alarm for Lid open
• Close the Lid
• Check the safety switch
E3
--Alarm for imbalance
• Is the laundry spread out evenly in the washer?
• In the washer set on a sturdy flat
surface?
• Check the safety switch
E4
--Alarm for not draining
• Is the drain hose down?
• Is the drain hose clogged?
• Check the drain valve
• Check the water level sensor
If the water dose not drain in 6minutes,
a buzzer will sound, and
the remaining time indicator will show

4 MALFUNCTIONS CODES AND EXPLANATIONS
13
DISPLAY CHECK
E5
—overflow alarm
• Check the water level sensor
•
Check the inter valve
• Is the pressure
pipe inflow

14
5 TROUBLESHOOTING
5.1 Alarm for inflow
Is Clothes Put
uniformity
Alarm for inflow
YES
Check SAFETY
DEVICE KIT
YES
Put uniformity
Change SAFETY
DEVICE KIT
NO
NO

15
5 TROUBLESHOOTING
5.1 Alarm for inflow
Check drain
hole
NO
Check drain
system
Check PCB
output voltage
Change drain system
parts
Change WATER LEVEL
SENSOR
Change PCB
YES
NO
NO
YES
YES

16
5 TROUBLESHOOTING
5.2 Alarm for drain
Is DRAIN PIPE
put down
Alarm for drain
YES
Check DRAIN
VALVE
Check WATER
LEVEL SENSOR
NO
Change PCB
Put down
Change DRAIN VALVE
NO
NO
Change WATER LEVEL
SENSOR
Check PCB
output voltage
NO
NO
YES

17
5 TROUBLESHOOTING
5.3 Alarm for Lid open
Is Lid open
Alarm for Lid open
YES
Check SAFETY
DEVICE
Check WIRING
HARNESS
NO
YES
Change PCB
Close lid
Change SAFETY
DEVICE
NO
yes
connect line again
NO

18
5 TROUBLESHOOTING
5.4 Alarm for imbalance
Is Clothes Put
uniformity
Alarm for imbalance
Check SAFETY
DEVICE
Check PCB
output voltage
Change PCB
Put uniformity
Change SAFETY
DEVICE KIT
YES
YES
YES
NO
NO

19
5 TROUBLESHOOTING
5.5 overflow alarm
Check the
water level
sensor
overflow alarm
Check the
inter valve
Is the
pressure pipe
inflow
Change pressure pipe
inflow , connect line
again
Change water level
sensor
Change inter valve
YES
YES
NO
NO
YES

20
5 TROUBLESHOOTING
5.7.1Washer Won't Start (Press the “POWER ”button, not light)
The most common part(s) or condition(s) which contribute to the
symptom Washer won't start are listed below. Check or test each item.
If you are still unable to solve the problem you may need to do additional
research and troubleshooting.
Causes Explanation
Incoming Power Problem
Check the power at the electrical outlet which the
washer is plugged into. Plug a lamp or radio into the
outlet to check it. If the outlet is dead, check the circuit
breakers or fuses for the home.
Power Cord If power supply is OK, the power cord itself might be
defective. This is rare. You can check the power cord
with an Ohm meter for continuity.
Line Fuse If the washer won't start the line fuse might have blown, or the line fuse holder might be damaged and need to
be replaced.
Main Control Board(PCB) If the washer won't start the main control board might
be defective.