Midea HQ-827WEN User manual

Service Manual_2022-V2.0
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Service Manual
French-Door Series
Applicable Models
Product Models
Applicable Models
HQ-827WEN
UR-BCD636WE-ST
22031040001341
The picture in this service manual is only for reference, and specific appearance
and configuration are subject to the real product.
This manual mainly teaches the method, the specific work skill needs engineer
to accumulate through the daily work.

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WARNING
Important Safety Notice
There are special components used in this equipment which are important for safety. These parts are
marked by in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement
Parts List. It is essential that these critical parts should be replaced with manufacturer’s specified parts to
prevent shock, fire or other hazards. Do not modify the original design without permission of
manufacturer.
WARNING
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 @2017
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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Contents
1. SIGNIFICANT UPDATE NOTES (NONE)........................................................................................................ 5
2. SAFETY WARNING............................................................................................................................................... 6
2.1WARNING FOR OPERATION SAFETY ........................................................................................................................... 6
2.2 SAFETY INSTRUCTION FOR REFRIGERANT................................................................................................................. 8
3. INSTALLATION AND COMMISSIONING............................................................................................................ 9
3.1 HANDLING................................................................................................................................................................... 9
3.2 DOOR DISASSEMBLY ANDASSEMBLY ........................................................................................................................ 9
3.3 INSTALLATION LOCATION .......................................................................................................................................... 11
3.4 LEVELING OF THE REFRIGERATOR........................................................................................................................... 12
3.5 INSTALLATION OF HANDLE........................................................................................................................................ 12
3.6ADJUSTMENT TO LEVEL THE DOOR .......................................................................................................................... 13
4. MAIN PARTS AND EXTERNAL DIMENSION....................................................................................................15
4.1 MAIN PARTS.............................................................................................................................................................. 15
4.2 EXTERNAL DIMENSION ............................................................................................................................................. 16
4.3 MIDEA PRODUCT SERIAL NUMBER AND LOCATION ................................................................................................... 17
5. ELECTRIC CONTROL SYSTEM.........................................................................................................................18
5.1 ELECTRICAL PARTS PARAMETERS............................................................................................................................ 18
5.2CIRCUIT DIAGRAM .................................................................................................................................................... 20
5.3 MAIN PCB TERMINAL CONNECTION DIAGRAM......................................................................................................... 21
5.4 INVERTER BOARD TERMINAL CONNECTION DIAGRAM（OPTION）.......................................................................... 22
6. REFRIGERATION SYSTEM................................................................................................................................23
6.1 REFRIGERATION SYSTEM WORKING PRINCIPLE....................................................................................................... 23
6.2 COOLING PIPELINE AND DRAIN PIPE INSIDE THE CABINET........................................................................................ 23
6.3 CIRCULATING ROUTE OF COOLING AIR..................................................................................................................... 24
6.4WELDING POINTS IN CHAMBERS OR FOAM LAYER.................................................................................................... 24
6.5WELDING POINT IN THE COMPRESSOR CASE........................................................................................................... 25
7. DISMANTLING OF PARTS..................................................................................................................................26
7.1 PARTS ON THE DOOR................................................................................................................................................ 26
7.2 PARTS INSIDE THE REFRIGERATOR .......................................................................................................................... 29
7.3 LIGHT SYSTEM.......................................................................................................................................................... 30
7.4AIR DUCT COMPONENTS REFRIGERATING CHAMBERAND FAN MOTOR.................................................................... 32
7.5 ICE MAKER................................................................................................................................................................ 33
7.6AIR DUCT COMPONENTS IN FREEZING CHAMBERAND FAN MOTOR.......................................................................... 34
7.7 EVAPORATOR AND DEFROST SYSTEM...................................................................................................................... 35
7.8 COMPRESSOR CASE ................................................................................................................................................ 36
7.11 DISPLAY CONTROL BOARD ..................................................................................................................................... 41
7.10 MAIN CONTROL BOARD .......................................................................................................................................... 42

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7.11WATERWAY SYSTEM............................................................................................................................................... 43
8. TEMPERATURE SENSING SYSTEM.................................................................................................................44
8.1 POSITION OF SENSORS............................................................................................................................................ 44
8.2 REPLACEMENT OF SENSORS ................................................................................................................................... 44
8.3 SENSOR WITHOUT TERMINAL REPLACEMENT .......................................................................................................... 45
8.4 SENSOR R/TTABLE.................................................................................................................................................. 46
9. FUNCTION AND OPERATION............................................................................................................................48
9.1 DISPLAY OPERATION PANEL ..................................................................................................................................... 48
9.2 TEMPERATURE CONTROL......................................................................................................................................... 48
9.3 MODE SETTING......................................................................................................................................................... 48
9.4 DEFROSTING FUNCTION........................................................................................................................................... 48
9.5 OPEN DOORALARM.................................................................................................................................................. 49
9.6 FAULT CODE AND SOLUTIONS................................................................................................................................... 49
9.7 TEST MODE............................................................................................................................................................... 51
9.8 EYE-ICE MAKER TEST.............................................................................................................................................. 51
9.9 DEMO MODE............................................................................................................................................................. 51
9.10 BACKUP DATA FOR POWER FAIL ............................................................................................................................. 52
10. COMPRESSOR ..................................................................................................................................................53
10.1 COMPRESSOR ON AND OFF CONTROL SPECIFICATIONS........................................................................................ 53
10.2 INVERTER DRIVER BOARD FAULTANALYSIS............................................................................................................ 53
11. TROUBLESHOOTING METHOD......................................................................................................................54
11.1 NO COOLING (AIR COOLING-ELECTRONIC)............................................................................................................ 54
11.2 NO WORKING OF COMPRESSOR............................................................................................................................. 55
11.3 INSIDE FROSTING,NO DEFROSTING....................................................................................................................... 55
11.4 INSIDE FROSTING,NO DEFROSTING-MAINTENANCE GUIDELINES.......................................................................... 56
11.5 LIGHT IS NOT ON..................................................................................................................................................... 57
11.6 FAN FAILURE........................................................................................................................................................... 57
11.7 DEFECTIVE DEFROST CIRCUIT ............................................................................................................................... 58
11.8 NOISE..................................................................................................................................................................... 58
11.9AIR DUCT NOT OPERATED (ELECTRONICALLY)....................................................................................................... 59
11.10 ICE MAKER NOT MAKE ICE .................................................................................................................................... 59
11.11 NO ICE OR CRUSHED ICE FALLING OFF THE DISTRIBUTOR (NONE)...................................................................... 59
12. PRODUCT EXPLODED VIEW AND SPARE PARTS LIST.............................................................................60

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1. Significant update notes (None)

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2. Safety Warning
2.1 Warning for operation safety
Important Safety Instructions
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol indicates that dangerous voltage
constituting a risk of electric shock is present
within your freezer.
This symbol indicates that there are important
operating and maintenance instructions in the
literature accompanying your freezer.
WARNING
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this appliance near water.
6) Clean only with a damp cloth.
7) Do not block any ventilation openings.
8) Install in accordance with the manufacturer’s instructions.
9) Do not install near any heat sources, such as radiators, heat registers, stoves, or
other apparatus that produce heat.
10) Do not defeat the safety purpose of the polarized or grounding-type plug.A
polarized plug has two blades with one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the third prong are provided for your
safety. If the provided plug does not fit into your outlet, consult an electrician for replacement
of the obsolete outlet.
11) Protect the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles, and the point where they exit from the appliance.
12) Do not attempt to modify or extend the power cord of this appliance.
13) Unplug this appliance during lightning storms or when it will not be used for long
periods of time.
14) Make sure that the available AC power matches the voltage requirements of this
appliance.

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CONNECTING ELECTRICITY
Electrical Shock Hazard.
Plug into a grounded 3-prong outlet.
Do not remove the ground prong.
Do not use an adapter.
Failure to follow these instructions can
result in death, fire, or electrical shock.
WARNING
Electric Shock Hazard
Failure to follow these instructions can result in electric shock, fire, or
death.
1) WARNING–Keep ventilation openings, in both the freezer and the built-in structure,
clear of obstruction.
2) WARNING–Do not touch the interior of the freezer with wet hands. This could result
in frost bite.
3) WARNING–Do not use mechanical devices or other means to accelerate the
defrosting process, other than those recommended by the manufacturer.
4) WARNING–Do not damage the refrigerant circuit.
5) WARNING–Do not damage the refrigerant tubing when handling, moving, or using
the freezer.
6) WARNING–DANGER–Never allow children to play with, operate, or crawl inside the
freezer. Risk of child entrapment. Before you throw away your old freezer:
6-1) Take off the doors
6-2) Leave the shelves in place so that children may not easily climb inside
7) Unplug the freezer before carrying out user maintenance on it.
8) This freezer can be used by children age eight years and older and persons with
reduced physical or mental capabilities or lack of experience and knowledge if they are
given supervision or instruction concerning the use of the freezer in a safe way and
understand the hazards involved. Children should not play with the freezer. Cleaning and
maintenance should not be performed by children without supervision.
9) If a component part is damaged, it must be replaced by the manufacturer, its service
agent, or similar qualified persons in order to avoid a hazard.
10) Please dispose of the freezer according to local regulations as the freezer contains
flammable gas and refrigerant.
11) Follow local regulations regarding disposal of the freezer due to flammable
refrigerant and gas. All refrigeration products contain refrigerants, which under the
guidelines of federal law must be removed before disposal. It is the consumer's
responsibility to comply with federal and local regulations when disposing of this product.
12) This freezer is intended to be used in household and similar environments.

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13) Do not store or use gasoline or any flammable liquids inside or in the vicinity of this
freezer.
14) Do not use extension cords or ungrounded (two-prong) adapters with this freezer. If
the power cord is too short, have a qualified electrician install an outlet near the freezer. Use
of an extension cord can negatively affect the freezer’s performance.
Grounding requirement
This freezer must be grounded. This freezer is equipped with a cord having a grounding
wire with a grounding plug. The plug must be inserted into an outlet that is properly installed
and grounded.
Improper use of the grounding plug can result in a risk of electric shock. Consult a
qualified electrician or service person if the grounding instructions are not completely
understood, or if doubt exists as to whether the freezer is properly grounded.
2.2 Safety instruction for refrigerant
Explosion Hazard.
Keep flammable materials and vapors, such as gasoline, away from freezer. Failure to do so
can result in fire, explosion, or death.
Safety instruction for refrigerant
DANGER–Risk of Fire or Explosion. Flammable Refrigerant Used. To Be Repaired Only By
Trained Service Personnel. Do Not Use Mechanical Devices. Do Not Puncture Refrigerant
Tubing. CAUTION–Risk of Fire or Explosion. Flammable Refrigerant Used. Consult Repair
Manual/Owner’s Guide Before Attempting To Service This Product. All Safety Precautions
Must be Followed. CAUTION–Risk of Fire or Explosion. Dispose of Properly In Accordance
With Federal Or Local Regulations. Flammable Refrigerant Used. CAUTION–Risk of Fire or
Explosion Due To Puncture Of Refrigerant Tubing; Follow Handling Instructions Carefully.
Flammable Refrigerant Used.

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3. Installation and commissioning
3.1 Handling
Handling
1) Protect the refrigerator in moving it,Same as shown
as left photo, please move it by handcart with cushion
2) Remove all packing materials and bottom cushion,
the move into house for placement
3) After moving it to appropriate location, wait for 2 hou
rs before power on.
3.2 Door Disassembly and Assembly
When the whole refrigerator cannot enter the room, the door can be disassembled, then
assembled after entering separately.
Door assembly
1）In the state of refrigerator door closure, use
screwdriver to remove the 4 fixed screws, and then
removes the left and right hinge cover.
2）During left (right) door disassembly, unplug the
harness plug at the left (right) side, remove the fixed
screw at left (right) side of the hinge.

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3）Take down the left (right) hinge.
4）Uplift the right/left cooler door and take it down from
the left (right) middle hinge;
Disassembly and assembly of freezer door and annex
1）open the refrigerator doors, and pull the freezer drawer
outwards to the end, then incline the inside drawer liner
at an angle and take it out;
2）With the assistive tooling, press down left and right
button of bracket;
3）Continue to pull drawer outwards so as to separate the
metal guide rail;

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4）Place the upper freezer drawer on ground as the way
shown in the right picture;
5）Separate the metal connection lever by pull the guide
rail to the opposite direction;
6）Push the gear slantingly as shown in right picture, and
separate the gear from the guide rail.
7) Reverse operation to complete installation
3.3 Installation location
Installation location
Please select a ventilated place to place the refrigerator,
and reserve space according to the recommended size
in the picture, which is beneficial for heat dissipation,
cooling performance improvement and power
consumption reduction.

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When the refrigerator is placed in the cabinet
(Counter-depth), you can reserve space according
to the recommended size shown in the picture, but
there should be a large enough vent at the top and
bottom of the cabinet to allow air flow. It is
recommended to install an exhaust fan.
3.4 Leveling of the refrigerator
Leveling of the refrigerator
If the refrigerator cannot be placed steadily, adjust the
footing to level it. Turn the feet clockwise to raise the
refrigerator; turn the feet counterclockwise to lower the
refrigerator.
3.5 Installation of handle
Installation of handle
Installation of handle

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1）Take out the bolts for fixing the handle from the
package bag of the user manual and then fasten it on the
door body with a cross screwdriver
2）Take out the door handle from the refrigerating
chamber, and place it in the two handle fixed bolts in the
direction as shown in the attached diagram
3）Use the allen wrench to fasten the screws in two holes
of each handle with the handle fixing bolts
4）The installation of freezer handle is same, the
placement of freezer handle is shown in the picture.
Please make sure the screw hole towards the ground in
installation.
3.6 Adjustment to level the door
Adjustment to level the door (Up and down)
Stuff the adjusting gasket in the hinge under the door to
be adjusted, so that the height of the left and right doors
can be consistent.

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Adjustment to in homogenous aperture the door (Up and down)
1) Use screwdriver to remove the 2 pcs screws, and
then remove the upper hinge cover.
2) Use screwdriver to loosen the 2 pcs screws, right
and left adjust the upper hinge to make door
aperture be homogeneity.
3) Put the hinge cover on suitable position, and then
use the screwdriver to fix the 2 pcs screws.
Adjustment to plane the door (left and right)
1) Use screwdriver to remove the 2 pcs screws, and
then remove the upper hinge cover.
2) Use screwdriver to loosen the 2 pcs screws, front
and back adjust the upper hinge to make door
aperture be homogeneity.
3) Put the hinge cover on suitable position, and then
use the screwdriver to fix the 2 pcs screws.

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4. Main parts and external dimension
4.1 Main parts
(The picture is only for reference, and specific appearance and configuration are subject to the real
product)
Refrigerator chamber
Freezer chamber

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4.2 External dimension
Description
Code
Size (mm)
Size (in)
Height to Top of Case
A
1775
69.88
Width
B
914
35.98
Depth w / No handle
C
737
29.02
Depth w / Handle
C1
795
31.30
Depth w / No door
C2
625
24.61
Depth (Door open 90 deg. w)
D
1097
43.19
Width (Door open 90 deg. w) No handle
E
1032
40.63
Width (Door open 90 deg. w) Handle
E1
1144
45.04
Depth (Door open 135 deg. w)
F
1047
41.22
Width (Door open 135 deg. w) No handle
G
1600
63
Width (Door open 135 deg. w) Handle
G1
1647
64.84
(The picture is only for reference)

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4.3 Midea product serial number and location
1）Product Serial Number —Including order number, production date and other information.When the
product occur problem, it needs to be recorded or photographed and provided to us.
2）Paste location
Some products also have S/N on the lower part of the right side of the Cabinet.

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5. Electric control system
5.1 Electrical parts parameters
Applicable Model
HQ-827WEN
Product Model
UR-BCD636WE-ST
Rated Voltage
115V 、60Hz
Item
Specification
Refrigerant
R600a
Compressor
TRA100E23DAH
(Part code : 11101020001442)
Starting device type
DC Inverter
The COP of compressor
2.00 (W/W)
The max cooling capacity of compressor
255 W
Winding resistance of compressor wiring
terminal (20℃)
U-W: 12.4Ω±5%
U-V: 12.4Ω±5%
W-V: 12.4Ω±5%
Winding resistance picture
Starter(PTC)
None
Overload protector(OLP)
MRA99991-9304
Integrate PTC+OLP
None
Inverter driver board
Have
(Part code : 17131000005321)
Capacitor
None
Motor
Fan motor of the freezing chamber
DC12V、3.0 W、1800r/min
Fan motor of the refrigerating chamber
None
Condensation fan motor in compressor case
DC12V、2.5 W、1300r/min
Electric damper and heater
DC12V、1W
Ice maker in freezer
DC12V、0.6W
Lights
Lights inside the freezing chamber
DC12V、0.6W
Lights inside the top of refrigerating chamber
DC12V、1.6W
Lights inside both sides of refrigerating
chamber
DC12V、1W
Chiller chamber light
None
Switch type of the lights
■Mechanical switch
□Magnetism control switch
Other electrical parts

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Water valve
220-240V 20W
Electric exchange valve
None
Power filter (EMI)
250V、4A
Power reactor (EU EMC)
115/230V、3A
Defrosting and heating parts
Defrosting sensor
NTC B3839 ( B5/25=3839K±2% )
Fuse in freezing chamber
AC250V/10A、77(0,-4) ℃
Defrost heater in freezing chamber
AC230V、190W
Flipping beam heating wire
AC220V、11W
Heating wire for freezing inlet water pipe
（Option）
DC12V、2.5W

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5.2 Circuit diagram
F: Freezer R: Refrigerator Def: Defrost T-H: Temperature and humidity RM: Refrigerator fan motor FM: Freezer fan motor