Midea SO-BD386WE-UT 14 cu ft Top Mount Refrigerator Owner’s Manual

Midea SO-BD386WE-UT 14 cu ft Top Mount Refrigerator

Product Information

Specifications

• Applicable Models: SO-BD386WE-UT UL-BD386WE-SQ UL-BD386WE-FQ
• Model No.: 22031010000120 22031010000112 22031010000107

Important Safety Notice

The Maintenance Manual is only for the use of maintenance personnel with certain experience and background in electrical, electronic, and mechanical fields. Any attempt to repair main devices may lead to personal injury and property loss. Manufacturers or distributors are not responsible for the content of the Manual and interpretation thereof.

Midea Refrigerators

Technical Maintenance Manual Copyright @2016. All rights reserved. Replication of all or part of the Manual in any forms shall not be allowed without written approval by the Overseas Sales Corporation of Midea Refrigerators.

Product Usage Instructions

Installation and Commissioning

The installation and commissioning process should be carried out by qualified personnel. Follow the steps below to install the product:

1. Choose a suitable location for the refrigerator.
2. Ensure the area is well-ventilated and away from direct sunlight or heat sources.
3. Place the refrigerator on a flat and stable surface.
4. Connect the power cord to a grounded electrical outlet.
5. Adjust the temperature settings according to your preference.
6. Allow the refrigerator to cool down for a few hours before placing any food items inside.

Function and Operation

To use the refrigerator effectively, follow these instructions:

1. Open the refrigerator door by pulling the handle.
2. Place food items inside the designated compartments and shelves.
3. Close the door firmly to ensure proper sealing.
4. Adjust the temperature settings as needed.
5. Regularly clean the interior of the refrigerator to maintain hygiene.
6. If any issues or malfunctions occur, refer to the troubleshooting section of the manual.

Troubleshooting Method

If you encounter any problems with the refrigerator, follow these troubleshooting steps:

1. Refer to the troubleshooting section of the manual for common issues and solutions.
2. If the problem persists, contact qualified maintenance personnel for assistance.
3. Provide them with detailed information about the issue, including any error codes or unusual behavior.
4. Follow their instructions for further troubleshooting or repair actions.

Figures and Details of Repair Parts

For detailed information about repair parts, refer to the separate documents provided with the manual.

FAQs

Q: Can I install the refrigerator in a small enclosed space?

A: It is not recommended to install the refrigerator in a small enclosed space as it requires proper ventilation to function efficiently.

Q: How often should I clean the interior of the refrigerator?

A: It is recommended to clean the interior of the refrigerator at least once every month to maintain hygiene and prevent odors.

Q: What should I do if the refrigerator is not cooling properly?

A: Check if the temperature settings are correct and ensure that the door is closing properly. If the issue persists, refer to the troubleshooting section of the manual or contact qualified maintenance personnel.

Service manual, 2016-12

Service Manual

Applicable Models
SO-BD386WE-UT UL-BD386WE-SQ UL-BD386WE-FQ

Model No.
22031010000120 22031010000112 22031010000107

(The picture is only for reference, and specific appearance and configuration are subject to the real product)

Prepared by

R&D:Zheng Qiang

Reviewed by Approved by

QA:Wang Tao SVC:Zhang Kun R&D:Geng Xiuhua SVC:Guang Taoshuai

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Service manual, 2016-12
Important Safety Notice
The Maintenance Manual is only for the use of maintenance personnel with certain experience and background in electrical, electronic and mechanical field.
Any attempt to repair main devices may lead to personal injury and property loss. Manufacturers or distributors are not responsible for the content of the Manual and interpretation thereof.
Midea Refrigerators
Technical Maintenance Manual Copyright @2016
All rights reserved. Replication of all or part of the Manual in any forms shall not be allowed without written approval by the Overseas Sales Corporation of Midea Refrigerators.
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Safety Warning Code

1.1Warning for operation safety

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1.2Safety instruction for refrigerant

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Description for product features

This product is provided with following features:

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(The picture is only for reference, and specific appearance and configuration are subject to the real product)
1 Full air-cooling and frost-free design 2Electronic temperature control system with more accurate temperature control. 3Open delay alarm function
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Installation and commissioning

3.1Handling

1. Protecttherefrigeratorinmovingit Sameasshownasleftphoto,pleasemoveitbyhandcartwi thcushion
2. Removeallpackingmaterialsandbottomcushion,then moveintohouseforplacement
3. Aftermovingittoappropriatelocation,waitfor2hoursbe forepoweron.

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3.2Disassembly (None)
The refrigerator door needs to be dismantled if it cannot enter the room in the whole.
3.3 Installation location
Location that is easy for ventilation shall be chosen to facilitate heat dissipation, enhance its performance and reduce the energy consumption.

3.4 Leveling of the refrigerator
If the refrigerator cannot be placed steadily, adjust the footing to level it.

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3.5Change the door opening direction(None) 3.6 Installation of handle

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3.7 Installation of door lock(None) 3.8 Adjustment to level the door(None) 3.9 Adjustment to shelves(None)
4.Terms
4.1 Definition of model(None) 4.2Location of nameplate

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(The picture is only for reference, and specific appearance and configuration are subject to the real product)
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Product specification

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5.1 typespecification(None)

5.2 Electrical parameters

Name

Product Name Product Code
Item Compressor
Starter

Overload protector

Compressor

Winding resistance of compressor wiring terminal

Type /
PTC
OLP

SO-BD386WE-UT
22031010000120 Specification PE50H1F-4SVL 8EA19C3/QP2-15/ QP2-15 3TM166TF2/DRB 18T61A1

UL-BD386WE-SQ
22031010000112 Specification EE50H1C
QPE2-A4R7MD3
DRB31T61A1

UL-BD386WE-FQ 22031010000107
Specification HYE60Y42
QP2-4R7
DRB33S61A1

Rmc:10-20 Rsc:30-50 Rms=Rmc+Rsc

Rmc:10-20 Rsc:30-50 Rms=Rmc+Rsc

Rmc1020 Rsc3050 Rms=Rmc+Rsc

Motor
Lights inside the
refrigerator

Variable frequency driver board Fan motor of the freezing chamber Ventilation door of the refrigerating chamber Condensation fan Lights inside the freezing chamber Lights inside the refrigerating chamber Switch of the refrigerator door

/
/ /
/ mechanicals
witch

/ DC12V/4W
/ / 240V/40W / sector

/ DC12V/4W
/ / 125V /40W / sector

/ DC12V/4W
125V /40W /
sector

5.3Inside temperature

Temperature tolerance 2 oC
Compartment Freezing
Refrigerating Variable temperature

The highest (oC) -24 / /

Lowest (oC) -26 / /

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5.4Defrosting parts

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Defrosting period
Defrosting sensor Thermal fuse
Defrosting heater in freezing chamber

Initial defrosting period Temperature is lower than 0 oC
NTC Can’t be restored
Steel pipe

Normal defrosting period 6~24 hours B3839 77 230V/180W 115V/180W

5.5Circuit diagram

SO-BD386WE-UT_22031010000120

UL-BD386WE-SQ_22031010000112(UL-BD386WE-FQ_22031010000107)
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Internal view and dimension

6.1Main parts and their names

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(The picture is only for reference, and specific appearance and configuration are subject to the real

product)

Freezing chamber

Refrigerator chamber

1.Air duct front plate

7.Freezer door tray

2.Steel wire storage rackbig

8.Reversible adjustable shelf

3.Air duct assembly of freezer

9.Refrigerator door tray

4.Steel wire storage racksmall

5.Steel wire drawer

6.Leveling feet

6.2External dimension

Front view

Side view

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Down view

Open Door

Maximum open angle of door(135o)
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(The picture is only for reference, and specific appearance and configuration are subject to the real product)
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Service manual, 2016-12 7.Refrigerating piping system and circulating route of cooling air

7.1 Refrigerating piping system

1Compressor2Right condenser3Anti-condensation tube4Left filter6Capillary tube7Evaporator8Suction tube1Compressor

condenser5Dry

(The picture is only for reference, and specific appearance and configuration are subject to the real product)

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7.2Circulating route of cooling air

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(The picture is only for reference, and specific appearance and configuration are subject to the real product)
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Dismantling of parts

8.1 Parts on the door
Door seal Door seal is installed into door liner groove. 1 Open the refrigerator door; 2 Take the door seal out of door liner;

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Door tray Lift up the bottle frame and take it out from the door liner of the refrigerator.

rollover beam
8.2Parts inside the refrigerator
Shelves 1 Pull out the partition plate completely. 2 Lift it up and take it out from the refrigerator.

None

Ice tray Refrigerator tray Drawer
8.3Light system
Light

None None None

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Light of the refrigerating chamber is located upper chamber 1 Remove the lamp cover 2 Remove the bulb
Light switch There is a light switch on the side wall of the refrigerating chamber. 1 Loosen the hook with small normal screwdriver
and pull out the switch until the wire connector reveals.
8.4Air duct and fan motor
Air duct components in freezing chamber All accessories in the freezing chamber should be dismantled before removing the air duct components. 1 Remove 2 screws on the cover plate of the freezing
air duct using a cross screwdriver; 2 Pull out the connector terminal of the fan motor;

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Fan motor

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1. Remove the fixed tape on the surface of motor 2) Hold the corner, and dismantle the motor from one
   side(without plastic clips) 3) Remove the sealing washer by force 4) Separate the fan motor and fin blade(pull by force) 5) Change the motor, the reverse operation is for
   assembly

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Damper assembly

None

8.5Evaporator and temperature sensing system

Evaporator in freezing chamber
1 Remove the air duct components in freezing chamber.
2 Disconnect all connectors. 3 Remove the welding on inlet and outlet tubes. 4 Remove two screws which are used to fix the
evaporator and remove the evaporator.

Components on the evaporator Fuse The fuse is located on top of the evaporator 1 connect the fuse connector. 2 Cut off the band which fixes the fuse. 3 Separate the fuse and the evaporator. *,Don’t break the welding of the evaporator in case that only the fuse needs to be replaced.

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Defrost sensor The defrost sensor is located on top of the evaporator. 1 Disconnect the connector of defrost sensor 2 Cut off the band which fixes the sensor. 3 Separate the sensor and the evaporator. ,Don’t break the welding of the evaporator in case that only the sensor needs to be replaced.
Defrost heater The defrost heater is located at bottom of the evaporator. 1 Disconnect the connector of defrost heater. 2 Cut off the band which fixes the defrost heater. 3 Take off the defrost heater from the evaporator. ,Don’t break the welding of the evaporator in case that only the defrost heater needs to be replaced.

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Ambient temperature sensor Ambient temperature sensor Ambient temperature sensor The ambient temperature sensor is placed in the display panel, it send the signal to the MPU

None None

Freezer sensor Freezer temperature sensor is placed in the upper position of air duct cover

8.6Compressor case
Rear cover and compressor case Condenser fan moto Terminal box of the compressor Standby condenser Piping system in the compressor case

None None None None

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anti-condensation piperight condenseroutlet of anti-condensation pipedry filterSuction pipe assembly Starter and protector of the compressor

transition pipeleft condenseranti-condensation pipedischarge and evaporating pipe

1. Remove the screws 1 Two screws outside 2 One screw inside

2. Remove the clipping strip Slowly pull it out

3. Remove the protective cover 1Pry the protective cover slowly from the upper part, 2Pull it out and remove it.

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4. Remove the starter and protector Unplug the starter and protector (you can use a screwdriver to pry it slowly)
5. The reverse process can complete installation. /
8.7Display and main control panel
Display 1)use slotted screwdriver to prize up the display PCB assembly slightly, to get the display PCB assembly 2)use cross screwdriver to remove the 4 pcs screws, to dismantle the display PCB 3)Unplug the wiring connector, change the display PCB, the reverse operation is for assembly
main control panel

1. Use cross screwdriver to remove the 2 screws, to get the main PCB assembly
2. Use slotted screwdriver to prize up the cover of main PCB box slightly
3. Use cross screwdriver remove the 1 pc screw of main PCB,and dismantle the main PCB
4. Unplug the wiring connector,change the main PCB, the reverse operation is for assembly

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8.8 Bar counter(None)
Disassembly and installation of bar counter Disassembly and installation bar doorseal
8.9 Water dispenser(None)
Disassembly and installation of water valve Disassembly and installation of water tank

None None
None None

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8.10 Ice maker(None)
Disassembly and installation of ice maker Disassembly and installation of water system Disassembly and installation ice machine sensor

None None None

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Function and operation

9.1 Operation panel

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9.2 Button
A Quick Freeze button B. Switch button of Fahrenheit display and Centigrade display C. Cancellation button of alarm D. Lock/Unlock button E. Temperature adjustment button (warmer) F. Temperature adjustment button(Colder)
9.3 Display screen
1. Freezer/Refrigerator temperature display zone 2. Indicated lamp of door open alarm 3. Indicated lamp of high temperature alarm
9.4 Display
·when power on the refrigerator, the display panel lighten for 3 seconds, and the start-up tone rings at same time, if it is the 1st time to power on the refrigerator, the default temperature setting is
-18 ·Normal display Digital display zone: if there is any failure happen, it will display the error code, if no, it displays the setting temperature, ·Display control(normal working mode, inspection mode) If in locked status, the display panel will darken if there is no any operation on control panel for 30 seconds, any operation on control panel will wake up the display panel. If there is failure happen, and there is corresponding error code related to this failure, the error code will
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display for 30 seconds, then darken.

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9.5 Setting of the gear
9.5.1Lock and unlock In unlocked status, press the button(LOCK/UNLOCK) for 3S,to enter into the locked status In locked status, press the button(LOCK/UNLOCK) for 3S,to enter into the unlocked status Note All below operations must be in unlock status 9.5.2Switch between Fahrenheit and Centigrade When it displays Centigrade, press the switch button(/),it will be switched to Fahrenheit display When it displays Fahrenheit, press the switch button(/),it will be switched to Centigrade display 9.5.3Temperature setting and the switch between refrigerator and freezerPress temperature adjustment button(E&F) to set the temperature, during the setting ,the temperature digit will blink, the temperature setting range -14~-22(not change circularly); it will quit setting status and take effect with the setting till the digit blink for 10 seconds.(it also can take effect manually if press the Lock/Unlock(D) button after temperature setting) 9.5.4Quick freeze function 1. Entry condition If the refrigerator works as a freezer, press Quick Freeze button to enter into quick freeze mode, the temperature digit displays -24 or -11 2. working process During working in quick freeze mode, the compressor switch on, the default time is 6 hours 3. Exit condition 1.The quick freeze mode will exit automatically after works for 6 hours or 48 hours 2. Press quick freeze button to exit quick freeze mode 3. when operate the temperature adjustment button, the quick freeze mode will exit If the quick freeze mode exit, the product will work according to last temperature setting

9.6 Control of standby function(None)

9.7 Control of ice maker (None)

9.8 Fault code and solutions

Fault code E2
E5 E6

Fault content Error Code
Freezer temperature E2 sensor fail

Defrosting sensor fail

E5

Ambient temperature

E6

Steps for maintenance methods
Step 1: to check whether the CN4 wiring connector connect well, unplug and plug in again; Step2: to check whether there is foreign object on the wiring connector of sensor, unplug the connector by refering to chapter 8.5, and check the Ohmic value by comparing with the resistance sheet Step3: change the main PCB Step4: Change the wiring harness Step 1: to check whether the CN4 wiring connector connect well, unplug and plug in again; Step2: to check whether there is foreign object on the wiring connector of sensor, unplug the connector by refering to chapter 8.5, and check the Ohmic value by comparing with the resistance sheet Step3: change the main PCB Step4: Change the wiring harness Step1: to check whether the whether the wiring harness connected well
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sensor fail

E9

F room high temp alarm

E9

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Step2:change the main PCB Step3:change the display PCB Check the temperature of F room and check whether the door seal fan motor and compressor of F room operate normally

9.9Defrosting function

1.Defrost the freezing chamber as per the accumulative operation time of the Compressor2.If power failure occurs abruptly to the Compressor and the defrosting sensor in freezing chamber is less than 0 oC after powering on, then first conduct defrosting once. If more than 0 oC, then defrosting is not needed.
3.After that, conduct defrosting according to using condition and ambient temperature in a period
between 6 and 24 hours as per the accumulative operation time of the Compressor.

9.10Test mode

Mandatory Defrost 1) enter into Press the button both””and “”for 3senconds, it will enter into mandatory defrost, the display panel will display figure “3” If the defrosting sensor failure happen, the heater will work 20 minutes, then turn off,. If the defrosting sensor failure happen during the defrosting, the heater only work 3 minutes after that, then turn off 2) Exit exit manually: under the state of mandatory defrost, press both button both “”and “” for 3 seconds, it will exit the mandatory defrost after 3 minutes Exit automatically : defrost for 3 minutes ,then judge the exiting condition for exiting. 3) working state, same as the normal defrosting
9.11Self-diagnosis
Entry condition With 3 seconds after power on, if there is no sensor failure and the actual measured temperature 0, it will enter into self-diagnosis Process of Self-diagnosis 1. Switch on the defrosting heater for 5 seconds, then switch off for 5 seconds 2. Switch on the fan motor for 5 seconds, then switch off for 5 seconds 3. turn on the fan motor and compressor at same time 4.it will exit the self-diagnosis after 20 minutes. If there is sensor failure happen, it will exit the Self-diagnosis immediately

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Circuit description

10.1 Power Supply

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AC input power will be treated by transformer ,and rectified when through D1~D4,then filtered by E1 capacitor .it will output stable DC12V after through there terminal regulator 7812, DC12V is for provide power to relay(control strong electricity), the relay is for control the on-off of compressor, and the defrosting heater. DC12V will be changed into DV5V after through modifier 7805, 5V is for provide power to main PCB , main PCB monitors the status of inside temperature.
10.2Door trip test circuit

Current of strong electricity of lamp will be output onto terminal of weak currnet side by PC817 opto-isolator, then reduced voltage by R10,and rectified by D7 and D8. When door is opened , the circuit of switch is closed, and the PWM wave is detected by the terminal of weak current, and main PCB receive the signal. When door is closed, the circuit of switch is open, no wave is detected, and main PCB judge it as the signal of door closed
10.3Temperature test circuit
It’s conducted by the sensor, making use of the characteristics that resistance value reduces as the temperature increases, and the thermistor that has temperature coefficient of resistance in medium temperature.
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Service manual, 2016-12
The characteristic that resistance value reduces as the temperature increases is deemed to have negative slope or negative temperature coefficient (NTC), and such thermistor is called as NTC thermistor. The resistance value changes sensitively with temperature and typically changes 7% ~ 3% per degree centigrade. Sensor used in the refrigerator is NTC thermistor.
There is following computing formula for the sensor:Sampling voltage / reference voltage = R1 / (RNTC + R1)
AD value / reference AD value = R1 / (RNTC + R1) The reference voltage is 5V, RNTC is the resistance value of the sensor, R1 is R31R32R33 in schematic diagram that is 5.1K
10.4Fan motor circuit of the freezing chamber
The fan in the freezing chamber is running when the compressor is operating. Check 12V and FAN to see if there is a voltage of 12V. When in normal operation, the fan is in low level and the voltage between 12V and FAN is more than 11V. If theres no voltage when the compressor is in operation, fan motor or electric control panel can be replaced.
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10.5Refrigerator fan motor circuit (None) 10.6Condensing fan motor circuit (None) 10.7Damper motor circuit (None) 10.8Resistance value of the sensor (R/T)

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Tx() RK Tx()

-30

33.81

-15

-29

31.85

-14

-28

30.01

-13

-27

28.29

-12

-26

26.68

-11

-25

25.17

-10

-24

23.76

-9

-23

22.43

-8

-22

21.18

-7

-21

20.01

-6

-20

18.9

-5

-19

17.87

-4

-18

16.9

-3

-17

15.98

-2

-16

15.12

-1

RK
14.31 13.55 12.83 12.16 11.52 10.92 10.35 9.82 9.316 8.841 8.392 7.968 7.568 7.19 6.833

Tx()

RK

Tx()

0

6.495

15

1

6.175

16

2

5.873

17

3

5.587

18

4

5.315

19

5

5.06

20

6

4.818

21

7

4.589

22

8

4.372

23

9

4.167

24

10

3.972

25

11

3.788

26

12

3.613

27

13

3.447

28

14

3.29

29

RK Tx() RK

3.141 2.999 2.865 2.737 2.616 2.501 2.391 2.287 2.188 2.094 2.005 1.919 1.838 1.761 1.687

30

1.617

31

1.55

32

1.486

33

1.426

34

1.368

35

1.312

36

1.259

37

1.209

38

1.161

39

1.115

40

1.071

41

1.029

42

0.9885

43

0.9506

44

0.914

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Troubleshooting Method

11.1 No refrigeration

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11.2 Compressor failure

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11.3 Defrosting is not working

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11.4 Fan in the freezing chamber is abnormal

Refer to this method for other fans.

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11.5 Damper is abnormal(None) 11.6 Lights inside the refrigerator don’t light up

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12. Figures and details of repair parts(Documents are provided separately)
12.1 Figure 12.2 List of parts and components
13Appendix:
13.1Electrical Schematic Diagram
(Model:***)
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13.2refrigerator maintenance tooling and equipment and material

Tooling No.

Name

Photo

Main Usage

1

Phillips screwdriver

screw assemble and disassemble

2 slotted screwdriver/scraper

3

Socket spanner 5/16

screw and rivet assemble and disassemble
hinge and compressor screw assemble and disassemble
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4

Sucker

5 Allen wrench2.8~4mm

6

Vise grip pliers

7

Pipe cutter

8

Knife

9

Nipper pliers

10 Capillary tube scissors

Equipment

No.

Name

Photo

Service manual, 2016-12
display panel and air duct cover disassemble
handle assemble and disassemble
sealing process tube

pipe cutting

assistive tool

assistive tool

Shear capillary

Main Usage

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1

Vacuum pump

2

Electronic scale

High pressure nitrogen with

3

piezometer

4

Soldering gun

5

Quick coupling

6

hand leak detector

material

No.

Name

Photo

Service manual, 2016-12
vacuum pumping
weighing refrigerant/gas
pipe and cooling system(condenser, evaporator, etc) impurities clean
heating and welding
connection process pipeline,vacuumorchargerefriger antwillbeused.
welding point leakage detect, if no, use soap-suds Main Usage
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1

Process pipeline

2

Dry filter

3

Copper welding rod

4

Refrigerant/gas

5

Sealing tape

Service manual, 2016-12
Chargetherefrigerant
Involving a system failure to be replaced
tube welding
Add refrigerant to the system
door fixing for reversible door option

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Service manual, 2016-12
Midea Refrigerators
If you need to get detailed technical information from the manufacturer, please contact:
xxx@midea.com
Refrigeration Division Overseas Sales Company Address: No. 176, Jinxiu Avenue, Economic-Technological Development Area, Hefei, Anhui, China
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