Midea COMPACT UR-BC126CM-ST User manual

Service Manual_2021-V1.0
1
Service Manual
COMPACT SERIES
Applicable Models
Model Code
Applicable Models
HS-164LN
UR-BC126CM-ST
22031010004043
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.

Service Manual_2021-V1.0
2
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.

Service Manual_2021-V1.0
3
Contents
1. SIGNIFICANT UPDATE NOTES (NONE)............................................................................................................ 5
2. SAFETY WARNING CODE................................................................................................................................... 6
2.1WARNING FOR OPERATION SAFETY ........................................................................................................................... 6
2.2 SAFETY INSTRUCTION FOR REFRIGERANT................................................................................................................. 8
3. TRANSPORT ......................................................................................................................................................... 9
3.1 HANDLING................................................................................................................................................................... 9
4. INSTALLATION AND COMMISSIONING...........................................................................................................10
4.1 DOOR DISASSEMBLY AND ASSEMBLY ...................................................................................................................... 10
4.2 INSTALLATION LOCATION .......................................................................................................................................... 10
4.3 LEVELING OF THE REFRIGERATOR........................................................................................................................... 10
4.4 LEFT OR RIGHT OPEN DOOR REVERSAL................................................................................................................... 10
4.5 INSTALLATION OF HANDLE（NONE）...................................................................................................................... 11
4.6 INSTALLATION OF DOOR LOCK（NONE）................................................................................................................ 11
5. PRODUCT CONFIGURATION AND DIMENSION.............................................................................................12
5.1 MAIN PARTS AND THEIR NAMES................................................................................................................................ 12
5.2 EXTERNAL DIMENSION ............................................................................................................................................. 12
5.3 LOCATION OF S/N.................................................................................................................................................... 13
6. PRODUCT SPECIFICATION...............................................................................................................................14
6.1 ELECTRICAL PARAMETERS....................................................................................................................................... 14
6.2 COOLING TEMPERATURE SETTING RANGE............................................................................................................... 14
6.3 CIRCUIT DIAGRAM .................................................................................................................................................... 15
7. REFRIGERATING PIPING SYSTEM AND CIRCULATING ROUTE OF COOLING AIR................................16
7.1 REFRIGERATING PIPING SYSTEM ............................................................................................................................. 16
8. DISMANTLING OF PARTS..................................................................................................................................17
8.1 PARTS ON THE DOOR................................................................................................................................................ 17
8.2 PARTS INSIDE THE REFRIGERATOR .......................................................................................................................... 17
8.3 LIGHT SYSTEM.......................................................................................................................................................... 18
8.4 EVAPORATOR AND DEFROST SYSTEM（NONE）.................................................................................................... 18
8.5 COMPRESSOR CASE ................................................................................................................................................ 18
8.6 DISPLAY CONTROL BOARD（NONE）...................................................................................................................... 22
9. TEMPERATURE SENSING SYSTEM.................................................................................................................23
9.1 THERMOSTAT............................................................................................................................................................ 23
10. FUNCTION AND OPERATION..........................................................................................................................24
10.1 OPERATION PANEL................................................................................................................................................. 24
10.2 TEMPERATURE SETTING ........................................................................................................................................ 24

Service Manual_2021-V1.0
4
10.3 OPEN DOOR ALARML (NONE)................................................................................................................................. 24
11. COMPRESSOR...................................................................................................................................................25
11.1 COMPRESSOR ON AND OFF CONTROL SPECIFICATIONS........................................................................................ 25
12. TROUBLESHOOTING METHOD......................................................................................................................26
12.1 NOT COOLING......................................................................................................................................................... 26
12.2 NO WORKING OF COMPRESSOR ............................................................................................................................ 27
12.3 THERMOSTAT MALFUNCTION-UNDERCOOLING...................................................................................................... 27
12.4 INSIDE FROSTING,NO DEFROSTING....................................................................................................................... 28
12.5 INSIDE FROSTING,NO DEFROSTING-MAINTENANCE GUIDELINES.......................................................................... 28
12.6 LIGHT IS NOT ON..................................................................................................................................................... 29
12.7 NOISE..................................................................................................................................................................... 30
13. FIGURES AND DETAILS OF REPAIR PARTS................................................................................................31

Service Manual_2021-V1.0
5
1. Significant update notes (None)

Service Manual_2021-V1.0
6
2. Safety Warning Code
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.

Service Manual_2021-V1.0
7
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.

Service Manual_2021-V1.0
8
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 InAccordance
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.

Service Manual_2021-V1.0
9
3. Transport
3.1 Handling
Handling
1)Protect the refrigerator in moving it,Same as shown as lef
t photo, please move it by handcart with cushion
2)Remove all packing materials and bottom cushion, the m
ove into house for placement
3)After moving it to appropriate location, wait for 2 hours bef
ore power on.

Service Manual_2021-V1.0
10
4. Installation and commissioning
4.1 Door Disassembly and Assembly
The refrigerator door needs to be dismantled if it cannot enter the room in the whole.
4.2 Installation location
Installation location
Location that is easy for ventilation shall be chosen to
facilitate heat dissipation, enhance its performance and
reduce the energy consumption.
4.3 Leveling of the refrigerator
Leveling of the refrigerator
If the refrigerator cannot be placed steadily, adjust the
footing to level it.
4.4 Left or right open door reversal
Door reversal
Door reversal

Service Manual_2021-V1.0
11
Dismantle the upper hinge cover，screws and upper
hinge，and remove the plastic screw hole caps from
the other side.
Dismantle the door and the bottom hinge assembly
and adjustable foot, then assemble the bottom hinge
assembly and adjustable foot on other side.
Put the door on bottom hinge and assemble the
upper hinge, upper hinge cover and plastic screw
hole caps successively.
4.5 Installation of handle（None）
4.6 Installation of door lock（None）

Service Manual_2021-V1.0
12
5. Product configuration and dimension
5.1 Main parts and their names
(The picture is only for reference, and specific appearance and configuration are subject to the real
product)
5.2 External dimension
Description
Code
Size (mm)
Height to Top of Case
A
860
Width
B
495
Depth w/Cabinet
C
470
Depth w/Door
D
540
Depth w/Handle
E
540
Depth (Door open 90 deg. w)
F
994
Width (Door open 180 deg. w)
G
975
Depth (Door open 180 deg. w)
H
675

Service Manual_2021-V1.0
13
(The picture is only for reference)
5.3 Location of S/N
Some products also have S/N on the lower part of the right side of the Cabinet.

Service Manual_2021-V1.0
14
6. Product specification
6.1 Electrical parameters
Applicable Models
HS-164LN
Product Name
UR-BC126CM-ST
Item
Specification
Specification
Refrigerant
R600a
Compressor
DFB30DF
Starter(PTC)
QP2-4R7
Overload protector(OLP)
DRB16N61A1
Integrate PTC+OLP
/
Variable frequency driver board
None
Capacitor
None
Power filter
None
Winding resistance of compressor
wiring terminal
Rmc: 13.04±7%Ω
Rsc: 5.6±7%Ω
Rms=Rmc+Rsc
Winding resistance picture
The input power of compressor
53.3W
Lights inside the refrigerator
Lights inside the refrigerating chamber
LED
Switch of the refrigerator door
YES
6.2 Cooling temperature setting range
Compartment
The highest (oC)
Lowest (oC)
Freezing
/
/
Refrigerating
10
-4

Service Manual_2021-V1.0
15
6.3 Circuit diagram

Service Manual_2021-V1.0
16
7. Refrigerating piping system and circulating route of cooling air
7.1 Refrigerating piping system
❶Compressor❷Condenser❸Dry filter❹Capillary tube❺Evaporator❻Suction tube❶Compressor

Service Manual_2021-V1.0
17
8. Dismantling of parts
8.1 Parts on the door
Door seal
It's more convenient to pull out from the corner.
Take the door seal ①out of door liner;
When reloading, the door must be installed into the tank,
carefully pressed flat, and check whether there is a gap
between the door seal and the box body.
Guardrail
Grab the Guardrail and squeeze it sideways
Pull out and remove from the refrigerator
8.2 Parts inside the refrigerator
Shelf assembly of refrigerator
Used to place vegetables，fruits and other items.
Lift up the division plate with a proper force and pull it out
towards yourself;
Freezer Drawer
None
Freezer Drawer
None

Service Manual_2021-V1.0
18
8.3 Light system
Light
Light of the refrigerating
The light at the right of refrigerator chamber.
1、Remove the light cover
2、Loosen the thermostat knob and fastening screw, and
remove the thermostat box assembly
3、Remove the connector
4、Remove the light
Light of the freezing
Light of the freezing
None
Light switch
There is a light switch on the side wall of the refrigerating
chamber.
Loosen the hook with small normal screwdriver and pull
out the switch until the wire connector reveals.
8.4 Evaporator and Defrost system（None）
8.5 Compressor case
Rear cover and compressor case
None
Compressor and the cooling system pipe

Service Manual_2021-V1.0
19
1）Cut off the power, remove the goods in the refrigerator,
with the tape to make the door fixed firmly and prevent
the door dropping when the refrigerator dumping.
2）Slowly tilt the refrigerator forward, relying on the wall or
a solid enough object, leaving space to facilitate the
operation. For safety, it should be carried by someone to
prevent its falling.
3）Cut off the compressor pipeline.-❶Cut off the process
pipeline.-❷Cut off the low-pressure muffler.-❸Cut off
the high-pressure exhaust pipe.
4-1）Remove the screws(for some models)
-Two screws outside
-One screw inside
4-2）Remove the metal clamp(for some models)
-Disassembly the metal clamp that is fix the electric
appliance shield

Service Manual_2021-V1.0
20
5）Remove the clipping strip
Slowly pull it out
6）Remove the protective cover
-Pry the protective cover slowly from the upper part,
-Pull it out and remove it.
7）Remove the starter and protector
Unplug the starter and protector (you can use a
screwdriver to pry it slowly)
8）Loosen the screw of the compressor bottom plate,
remove the floor together with the compressor from the
box.
9）Use the wrench to remove the bolts by
steps❹❺❻❼, replace the compressor and reverse
process can complete installation.