Haier RMD52HLCS0 User manual

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MODEL: RMD52HLCS0
SERVICE MANUAL
Refrigerator
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It
dose not contain warnings and cautions to advice non-technical individuals of potential dangers in attempting to service a product.
Product powered by electricity should by serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
WARNING

Contents
Chapter 1 General Information .............................................................................................................................. 3
1-1. General Guidelines ......................................................................................................................................... 3
1-2. Insurance test.................................................................................................................................................. 3
1-3. How to read this Service Manual.................................................................................................................... 4
Chapter 2 Product Feature...................................................................................................................................... 5
2-1. Specifications.................................................................................................................................................. 5
2-2. Main Functions............................................................................................................................................... 5
2-3. External views ................................................................................................................................................ 6
Chapter3 Disassembly and Installation.................................................................................................................. 7
3-1. Display panel Disassembly............................................................................................................................. 7
3-2. Main Control Board and Power Cable Disassembly ...................................................................................... 7
3-3 .Removing Shelf to Clean................................................................................................................................ 8
3-4.Adjust Bottle and clean.................................................................................................................................... 8
3-5. Freezer air duct cover assembly and disassembly .......................................................................................... 8
3-5. Refrigerator air duct cover assembly and disassembly................................................................................... 9
Chapter 4 Control and display system ................................................................................................................. 10
4-1.Control panel ................................................................................................................................................. 10
4-2.Lock/Unlock setting....................................................................................................................................... 10
4-3.Intelligence/Holiday function settings........................................................................................................... 10
4-4.Quick-cooling function setting ...................................................................................................................... 11
4-5.Quick-freezing function setting..................................................................................................................... 11
4-6.Temperature setting and adjustment.............................................................................................................. 11
4-7.Door alarm..................................................................................................................................................... 12
4-8.Power-off memory......................................................................................................................................... 12
Chapter 5 Control principal and related test functions......................................................................................... 13
5-1.Refrigerator`s temperature control introduction............................................................................................ 13
5-2. Defrost control.............................................................................................................................................. 13
5-3. Sensor`s position and control principle ........................................................................................................ 14
5-4. Operating description of combination key.................................................................................................... 15
Chapter 6 System flow principle.......................................................................................................................... 17
6-1.System flow scenograph................................................................................................................................ 17
6-2.System flow chart.......................................................................................................................................... 17
Chapter 7 Circuit diagram.................................................................................................................................... 18
7-1. Main control PCB diagram........................................................................................................................... 18
7-2. Brief principle diagram................................................................................................................................. 19
Chapter 8 Trouble shooting and fault detecting................................................................................................... 20
8-1. Frequent problem.......................................................................................................................................... 20
8-2. Fault diagnosis and display method.............................................................................................................. 22

Chapter 1 General Information
1-1. General Guidelines
When servicing, observe the original lead dress. If a short circuit is found, replace all parts which
have been overheated or damaged by the short circuit. After servicing, see to it that all the
protective devices such as insulation barriers, insulation papers shields are properly installed.
After servicing, make the following leakage current checks to prevent the customer from being
exposed to shock hazards.
1) Leakage Current Cold Check
2) Leakage Current Hot Check
3) Prevention of Electro Static Discharge (ESD) to Electrostatic Sensitive
1-2. Insurance test
1. Check if there is any leak of current.
2. Cut out the power supply before the repair to avoid an electrical shock hazard.
3. In the case of a live-line test, insulating gloves should be worn to avoid potential electrical
shock.
4. Confirm the rated current, voltage and capacity before testing with any kinds of instruments.
5. Watch if the upper door is open when you check something at a lower position.
6. Take out every part in the cabinet before moving the machine, especially things like panels
(e.g. glass shelf).
7. Please wear intact cotton gloves when repair any parts of the evaporator, so that scratches by
the sharp fins can be avoided.
8. If there is a breakdown with the refrigeration system, please surrender the machine to the
service center, else the leaked refrigerant may pollute the atmosphere.
9. The refrigerator use AC of 220V with a frequency of 50Hz.
10. A big fluctuation of voltage (exceed the range 187～242V) may cause a start failure of the
refrigerator, a burn-out of the control panel and compressor, or an abnormal sound from the
compressor in operation. In this condition an automatic voltage regulator over 60W should be
added.
11. Take care not to damage the supply line. Don’t yank at the line; pull the plug out gently from
the receptacle. Don’t press the line under the cabinet or step on it. Take care not to roll on or
damage the supply line when moves the machine from the wall.
12. In the case of leakage of inflammable gases like carbon monoxide, open the door and
windows. Don’t pull out or insert the plugs of the appliance.
13. Don’t touch the refrigeration surface of the freezing compartment when the refrigerator is in
operation, especially when your hand is wet, else you may be glued to the surface.
14. Pull out the plug of power supply during clearance or power outage. Wait at least five minutes
to resume the power supply in order to prevent damage to the compressor caused by
continuous restart.

Photo used in this manual
The illustration and photos used in this Manual may not base on the final design of products, which
may differ from your products in some way.
1-3. How to read this Service Manual
The meaning of each icon is described in the table below:
Note:
A “note” provides information that is not indispensable.
Caution:
A “caution” is used when there is danger, through incorrect manipulation, may damage equipment,
loose data, get an unexpected result or has to restart (part of) a procedure.
Warning:
A “warning” is used when there is danger of personal injury.
Reference:
A “reference” guides to find additional information on a specific topic.

Chapter 2 Product Feature
2-1. Specifications
Model RMD52HLCS0
1. Product identification
Description of appliance Side By Side
Type of appliance(FS = free standing, BI = built-in) FS
Supplier own brand MABE
2. Basic features
Climate class
(SN=10~32°C, N=16~32°C, ST=18~38°C, T=18~43°C) N.
Gross capacity l 521
capacity refrigerator compartment l 328
et capacity freezer compartment (total) l 190
Freezing capacity kg/24 h 10
Max storage time by power failure（Freezer）h 5
Refrigerant R600a/80g
3. Control panel
External control display LED
Temperature range (from>to) °C (Fridge)1~9°C/
(freezer)-24~-14°C
Super Cooling (Fridge) YES
Super Freezing (Freezer) YES
Stand-by function (Holidays) YES
4. Basics dates
Voltage / frequency 220/50
Input power / mains fuse (intensity) W /A 200/1.8
Length of cable/incl. plug cm 349
5. Packing dimensions
Unit dimensions without handle ( H / W / D) mm 1790*908*655
Net weight kg 98
Packing dimensions (H / W / D) mm 1890*980*730
Gross weight kg 112
2-2. Main Functions
1.Single cooling system with air-cooled computer control, there is a freezer evaporator in
freezing room, fridge room temperature is controlled by ON/OFF of electronic air damper.
2. Super bright LED& energy-saving, brighter& better reliability.
3. Fault code automatically hiding function.

2-3. External views

Chapter3 Disassembly and Installation
Note: Unplug the power cord from the outlet when demount the refrigerator.
3-1. Display panel Disassembly
You can aspirate the display panel by using vacuum suction nozzle.
Note: you need to use vacuum suction nozzle in the red zone.
3-2. Main Control Board and Power Cable Disassembly
Non professionals do not remove the main control board (including open the control box)
1 Check the power supply cable and ensure power off to disassemble.
2 open the main control box by using a plum screwdriver, then you can see all the refrigerator
control board.
3 pull cable plug off on the refrigerator main control board.
4 replace the damaged main control board.
5 cover the main control box, then fixed well with screw.
1. Remove the control board and power cable like picture

(Note: when you pull off the cable plug on the main control panel, you should press on the
plug buckle)
3-3 .Removing Shelf to Clean
Lift the front of shelf according to the direction of ①, then pull out the shelf according to the
direction of ②，and at the same time rotate the shelf to get it out completely according to the
direction of ③.
3-4.Adjust Bottle and clean
1 Lift up the bottle according to the direction of ①, then seize bottle`s both sides to pull out
according to the direction of ②
2 You can install bottle according to the reserve operation after cleaning, or you can adjust the
bottle`s height according to the position of food.
3-5. Freezer air duct cover assembly and disassembly
1. First remove the screw cap on the freezer air duct cover (in the red zone),
then take out screw by using cross screwdriver.

2. Seize the freezer air duct cover plate with your hands (in the red zone),
then take out the top air duct cover.
3. Take out the freezer bottom air duct cover on the interface of top and
bottom air duct cover (in the red zone).
3-5. Refrigerator air duct cover assembly and disassembly
Take out the screw (in the red zone)by using cross screwdriver, then seize the
air duct cover plate to pull out.

Chapter 4 Control and display system
4-1.Control panel
A.Refrigerating temperature display area
B.Freezing temperature display area
C.Holiday icon
D.Intelligent icon
E.Quick-cooling icon
F.Quick-freezing icon
G.Lock icon
H.Refrigerating temperature adjustment button
I.Freezing temperature adjustment button
J.Intelligent function adjustment button
K.Quick-cooling adjustment button
L.Quick-freezing adjustment button
M.Unlock/lock button
4-2.Lock/Unlock setting
In unlocked state, a buzz will be heard and "Lock icon" G will be illuminated after
“Unlock/lock button” M is pressed down for 3 consecutive seconds. Lock function will be
enabled. In locked state, "Lock icon" will turn off after "Unlock/Lock button" M is pressed
down for 3 consecutive seconds, then lock is removed.
In locked state, it's not allowed to regulate the refrigerating temperature, freezing
temperature, quick-cooling function, quick-freezing function and intelligent function, etc.
Caution
The following 3-6 functions should be all operated under unlocked state, and it's advised to
quit locked state if it's locked state if you intend to make such operations.
4-3.Intelligence/Holiday function settings
In unlocked state, "Intelligent icon" D will be illuminated upon a press on "Intelligent
function adjustment button" J, and the refrigerator will enter intelligent state; in intelligent
state, "Intelligent icon" D will turn off upon a press on "Intelligent function adjustment
button" J, and the refrigerator will quit intelligent state; in intelligent state, the refrigerator
regulates the temperature in the chamber automatically in accordance with the changes in
ambient temperature and internal temperature; in intelligent state, the default temperature
in the refrigerating chamber is 4℃, and it’s -18℃in the freezing chamber.
In unlocked state, “Holiday icon” C will be illuminated after "Intelligent function adjustment
button" J is pressed down for 3 consecutive seconds, and the refrigerator will enter
Holiday state; in Holiday state, “Holiday icon” will turn off after a press on "Intelligent
function adjustment button" J, and the refrigerator will quit Holiday state.
In Holiday state, the freezing chamber works normally and the temperature in the
refrigerating chamber is set as 17℃automatically. Such function helps avoid possible
odors in the refrigerating chamber and save energy.

4-4.Quick-cooling function setting
In unlocked state, “Quick-cooling icon” E will be illuminated upon a press on
“Quick-cooling adjustment button” K, and the refrigerator will enter quick-cooling state;
after reaching the set temperature, the refrigerator will shut down quick cooling function
automatically; if you intend to quit quick-cooling function manually, please press
“Quick-cooling adjustment button” K in quick-cooling state, “Quick-cooling icon” E will go
off and the refrigerator will quit quick-cooling function.
When a lot of food is placed in the refrigerating chamber, quick-cooling function may help
food reach the set temperature rapidly, and it’s favorable for long-time preservation of food.
It’s advised to use this function if you intend to put much food in the refrigerator at one
time.
Caution
In intelligent state, intelligent or holiday state will quit automatically when quick-cooling
function is enabled.
4-5.Quick-freezing function setting
In unlocked sate, “Quick-freezing icon” F will be illuminated upon a press on
“Quick-freezing adjustment button” L and the refrigerator will enter quick-freezing state;
when reaching the set temperature, the refrigerator will shut down quick-freezing function
automatically; if you intend to quit quick-freezing function manually, please press
“Quick-freezing adjustment button” L in quick-freezing state, the “Quick-freezing icon” F
will go off and the refrigerator will quit quick-freezing function.
Quick-freezing function is designed to keep the nutrition of food in the freezing chamber. It
can freeze the food in the shortest possible time. If you intend to freeze a lot of food at a
time, it’s advised to set the freezing function 12h in advance, and don’t put the food in
until the temperature turns lower in the freezing chamber. At this moment, the
freezing speed is accelerated in the freezing chamber and the food can be frozen
rapidly to secure the nutrition and facilitate preservation.
Caution
In intelligent state, the intelligent or holiday state will quit automatically when quick-freezing
function is enabled.
4-6.Temperature setting and adjustment
①Refrigerating temperature adjustment
In unlocked state, the value in “Refrigerating temperature display area” A will blink and
decrease 1℃upon each press on “Refrigerating temperature adjustment button” H. When
the blink stops, the actual refrigerating temperature will show in “Refrigerating
temperature display area” A. When the setting temperature reaches 9℃, it will return to
the minimum setting temperature1℃in the refrigerating chamber if “Refrigerating
temperature adjustment button” H is pressed again. Namely, the setting temperature of
the refrigerating chamber will be displayed in an order “04→03→02→01→09→08
→07→06→05→04”.
Caution
In quick-freezing, intelligent or locked state, it’s not allowed to adjust the setting temperature in
the refrigerating chamber. If you make the said adjustment in such state, the quick-cooling
function, intelligent or lock icon will blink, and a warning tone will be given to indicate that the
setting temperature in the refrigerating chamber cannot be adjusted.

②Freezing temperature adjustment
In unlocked sate, the setting value in “Freezing temperature display area” B reduces 1℃
and blinks upon each press on “Freezing temperature adjustment button” I, and the actual
temperature in the chamber will show in “Freezing temperature display area” B after the
blink stops. When the setting temperature reaches -24℃, it will turn to the maximum
setting temperature -14℃when “Freezing temperature adjustment button” I is pressed
again. Namely, the setting temperature is displayed in an order
“-18→-19→-20→-21→-22→-23→-24→-14→-15→-16→-17→-18”.
Caution
In quick-freezing, intelligent or locked state, it’s not allowed to adjust the setting temperature in
the freezing chamber. If you intend to make adjustment in such state, the quick-freezing,
intelligent or lock icon will blink, and a warning tone will be given to indicate that the setting
temperature in the freezing temperature cannot be adjusted in the current state.
4-7.Door alarm
When the door is open or not closed properly for a long while, the refrigerator will give an
alarm at intervals to remind you to close the door tightly.
4-8.Power-off memory
Upon power-off, the working state will be memorized instantaneous, and the refrigerator
will work in the set state before power-off when it’s powered on again.
Caution
Locking function will not be memorized, and the refrigerator will be in unlocked sate when it’s
powered on again.

Chapter 5 Control principal and related test
functions
5-1.Refrigerator`s temperature control introduction
Switch point of fridge setting temperature is based on fridge sensor SNR temperature;
When the fridge SNR temperature is greater than the starting point, fridge`s large wind door
will open;
When the fridge SNR temperature is less than shutdown point, fridge`s large wind door will
close;
When the refrigeratorSNRF temperature is greater than switch point,freezer fan motor will start,
or fan motor will stop.
Variable temperature position regulate by setting variable room`s key-press panel, the initial
setting state is in the fresh food section, once press set key, temperature position shift from
right to leftby recycling.
When the variable room SNRD SNR temperature is greater than the starting point，fridge`s
small wind door will open, or will close.
5-2. Defrost control
First power on to defrost & under fault state，compressor accumulatively work 5Hr, enter
the state of defrosting, fridge and freezer defrosting frozen at a time;
And do statistic and judgment according to the running time of compressor and
refrigeration，frozen door switch`s opening time, then defrosting fridge and freezer
separately or simultaneously.
Under normal working condition:
Defrosting cycle can change by defrosting control, change defrosting cycle and the door
opening and closing times and time, inner temperature is related to environmental
temperature.
Freezer defrosting:
When freezer door open more frequently, according to the different frequency,
compressor defrost one time every working 7~12 hours;
When freezer door open less times, according to the different frequency, compressor
defrost one time every working 12~24 hours;
The longest time for defrosting is refrigeratorrunning 72 hours;
Fridge defrosting:
When fridge door open more frequently, according to the different frequency, compressor
defrost one time every working 3~6 hours;
When fridge door open less times, according to the different frequency, compressor
defrost one time every working 6~12 hours;
The longest time for defrosting is refrigeratorrunning 72 hours;

5-3. Sensor`s position and control principle
Name Mark Position
Freezer sensor F SNR Center of freezer air duct assembly
Refrigerator sensor R SNR Center of refrigerator air duct assembly
Freezer defrosting sensor RD SNR On the freezer evaporator
Environment temperature
sensor RT SNR Under the refrigerator hinge box
Notes: The parameters of refrigerator sensor and environment temperature sensor are the same,
and can be general.

The parameters of freezer sensor, refrigerator defrosting sensor and freezer defrosting sensor
are the same and general.
5-4. Operating description of combination key
No. function state Enter operation Exit operation Time Remarks
1 Exhibition
function Lock
Press “Refrigerator” Fo
r
long time & continue
click
“Smart” for five times
The same with
enter operation
within
3s
Not memor
y
after power
off
2 Fault code Lock
Press “Refrigerator” Fo
r
long time & continue
click
“Freezer” for five times
The same with
enter operation;
No fault, exit
after 3 seconds;
Fault , exit
automatically
after 1 minutes
within
3s
Not memor
y
after power
off
3 Clear
EEPROM Lock
Press “Refrigerator”
For a long time
& continue to click
“Lock” for five times
Exit
automatically
within
3s
Not memor
y
after power
off
4 T mode Lock
Press “Freezer”
For a long time
& continue to click
“Smart” for five times
In T4 mode, click
“unlock” once,
exit after 3 secon
d
within
3s
Not memor
y
after power
off
5 Fine tuning Lock
Press “Freezer” For a
long time & continue to
click “Refrigerator” for
five times
The same with
enter operation
within
3s
Not memor
y
after power
off
6 Quick-coolin
g
Unlock Press “Refrigerator”
For a long time
The same with
enter operation
Long
by 3s
Memory
after power
off
7 Quick-freezin
g
Unlock Press “Freezer”
For a long time
The same with
enter operation
Long
by 3s
Memory
after power
off
8 Smart Unlock Press once The same with
enter operation
Long
by 3s
Memory
after power
off
9 Lock Unlock
Press “Lock/lock”
For a long time
The same with
enter operation
Long
by 3s
Not memor
y
after power
off
10 Smart, quick-cooling and quick-freezing have no priority.
Quick-cooling and quick-freezing can work at the same time.
Smart state can`t work together with quick-cooling and quick-freezing state.
11 Under smart state, invalid operation by pressing “Refrigerator” or “Freezer” once.

Under quick-cooling state, invalid operation by pressing “Refrigerator” once.
Under quick-freezing state, invalid operation by pressing “Freezer” once.
12 Under lock state, Any single operation is invalid.
13 Main control panel :0061800283A
Mechanical key SW1 is “TEST” key, which can directly enter T mode.
Click once to enter T1; click twice to enter T2; enter T1 to T4 by recycle.
Mechanical key SW2 is “shorten time” key. Click and buzzer ring once, shorten
minutes;
Press once for 3s and buzzer ring once, shorten 30 minutes.

Chapter 6 System flow principle
6-1.System flow scenograph
6-2.System flow chart

Low Voltage
Connecting Cable
Instruction
Strong Current
Connecting Cable
M
Light
Sensor
Fuse
Motor
Strong Current
Connecting Terminal
Low Voltage
Connecting Terminal
Switch
Assembled Components
Heater
MM
Ref Damper12V
M
Motor
Heater
Strip +12V
M
Cooling Fan
DC 13V/1.8W
Frozen Fan
DC 13V/3.6W
Ref LED
DC 12V 1.5W
Frz LED
DC 12V 1.5W
Defrost Heater
220V,187W
Network Interface
Power Plug
AC 220V/50Hz
Main Control Panel
0061800283* 220VAC 12/16VDC
Display
Panel +5V
Frz sensor +5V
Defrost Sensor +5V
Fuse 2
5-DFHAT
4-COMP
3-L
2-N
1-N
11-GND
10-FDOOR
9-GND
8-DFSNR
7-GND
6-FSNR
5-FFANV
4-FFANG
3-FFANF
2-FLED
1-+12V
10-TX 9-RX 8-+5V 7-GND 6-RBUE 5-RWTE 4-RYOW 3-RRED 2-RHAT 1-+12V 9-+12V 8-RLED 7-GND 6-RTSNR 5-RSNR 4-GND 3-RDOOR 2-GND 1-BDOOR 3-CFANV 2-CFANG 1-CFANF
Frz Door Switch +5V
Ref
Sensor+5V
Ambient
Sensor
+5V
Ref Door
Switch
+5V
Rapid Detection Interface
CN1
CN2
CN3
CN4
CN5
CN6
CN8
CN10
CN11
CN12
CN13
Fuse 1
Compressor
Red&White
Brown
Null
Blue&White
Blue
Pink Yellow Brown Blue Blue White Yellow Red Black Black
Gray White Black Black White Gray Orange Orange Null Red Black Purple
Orange
Orange
Blue
Blue
Black
Black
Red
Black
Purple
Gray
White
4-UVFAN 3-+12V 2-UVLED 1-+12V
Brown
Blue
None
4-+5V
3-GND
2-TX
1-RX
4-RX 3-TX 2-GND 1-+5V
Inverter
Panel

7-2. Brief principle diagram

Chapter 8Trouble shootingand fault detecting
8-1. Frequent problem
Nu
m
fault
phenomenon Detection method Maintenance
measures Use tools
1 Do not powe
r
on
1、Detect whether main control panel, display panel
and frequency conversion panel is matching ;
2、detect whether frequency conversion panel and
main control panel is connected properly;
3、Detect whether Connecting line between
frequency conversion panel and compressor is
normal;
4、Detect whether main control panel outpu
t
frequency signal
5、Enter the mandatory start to detect whethe
r
compressor is working;
Replace
correct
Component
Screwdriver
、multimete
r
2
Door body is
uneven
Side by side series:
1、Minor unevenness can adjust bottom foot;
2、Large height difference can increase the gasket
in the lower hinge parts;
3、
A
djustable hinge door body can adjust hinge to be
even;
Adjust & Repair
Screwdriver、
multimeter 、
poke rod
3
Fridge is in
deep freeze
cooling
1、Closing the fridge air outlet, detect air outlet
position and assembly whether cold air blowing
around, if that is not tightly sealed;
2、Take fridge electric air outlet apart, repeatedly
switching freezer, detect whether air door can freely
switch on/off, and close closely;
3、If the Department does not move, you can test
damper wiring terminal position and the main control
panel ,and check every line`s conducting state
according to the color;
4、If line is normal but throttle can`t act, that means
main control panel or throttle fault; use the normal
throttle or main control panel for testing to confirm
final faulted piece;
5、The above detection without problems, test
whether parameters of fridge sensor 1 are normal.
1、If throttle is not
tightly sealed,
seal lax part with
Sponge article;
2、If padlock is
not tightly closed,
generally throttle
is bad;
3、maintain line
section；
4、Replace the
defective part；
5、Replace
sensor.
Screwdriver、
multimeter
4
Sometimes
panel shows
fault code, or
displays
1、Check connector between freezer sensor and the
box body, and the internal terminal backing out,
ensure contact well;
2、Test parameter of freezer sensor;
If terminal take
off, adjust and
repair internal
terminal
Screwdriver