4.

TROUBLESHOOTING

4-1. Check-List before Trouble-Shooting

4-1-1. Test Function (Forced Operation / Forced Defrost)

4-1-1-1. How to Enter the TEST MODE

4-1-1-1-1. For Models with Electronic Displays

1. If the Freezer button and the Fridge button on the Panel PCB are pressed simultaneously for six seconds
or longer, the Panel Display will turn ON/OFF all displays for about four seconds with an interval of 0.5
seconds.
Here, if you take your finger off the Freezer button and the Fridge button and press the Fridge button, the
product will enter the Test Mode.
2. During the Test Mode, if you press any button from among the buttons on the Panel, it will work as a test
button.
3. If you press the Test button, it will change in the following order: Forced Operation 1, Forced Operation 2
(A-Valve/Fan OFF), Forced Operation 3 (F-Valve/Fan OFF), Forced R Defrosting, Forced F/R Defrosting,
Cancellation (normal operation), and Forced Operation 1.
4. If you want to cancel the Test mode in the middle, please turn OFF the power and turn it ON again.

1) Test Mode Entering Process

② ① ② ①

① Press the Freezer button and the Fridge button simultaneously for six seconds.
② When the Display starts blinking, press the Freezer button once.

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TROUBLESHOOTING

4-1-1-1-2. Models with ROTARY S/W (Fridge Room)

1. If repeating 3 times switch of 'Coldest' Choices as Rotary Switch and "Dead Zone" over a second choice, a Test key will be
recognized as a one circuit. However, the choice of "Coldest" and "Dead zone" exceed 5 seconds.
3 time Count is initialized.
2. If you press the Test button in the normal operation status, the test function will change in the following order: Forced
Operation 1, Forced Operation 2 (R-Valve/Fan OFF), Forced Operation 3
(F-Valve/Fan OFF), Forced R Defrosting, Forced F/R Defrosting, Cancellation
(normal operation), and Forced Operation 1.
3. If you press the Test button once in the normal mode, the product will enter
the Forced Operation 1 function.
3-1) Here, the Buzzer will perform alarm with a beep sound.
3-2) When forced operation is selected, the Comp. will immediately work without
the 15-minute delay in any operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and
forced operation will be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be careful.)
3-3) When forced operation is selected, the Comp. and the F-Fan continues to operate for 24 hours, and the R
Compartment will work by the set temperature.
3-4) During forced operation, the alarm will sound until the forced operation will be ended, and you can cancel forced
operation by repressing the Test button.
4. If you press the Test button again in the Forced Operation 1 status, the product will enter the Forced Operation 2 mode.
4-1) Here, the Buzzer will perform alarm with a beep sound.
4-2) When forced operation is selected, the Comp. will immediately work without the 15-minute delay in any operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and forced operation will be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be careful.)
4-3) When forced operation is selected, the Comp. and the F-Fan will continuously work for 24 hours, the R-Valve will be
closed, and the R-Fan will be OFF.
4-4) During the forced operation, the alarm will sound until the forced operation will be ended, and if you repress the Test
button, the Forced Operation 2 mode will be canceled.
5. If you press the Test button again in the Forced Operation 2 status, the product will enter the Forced Operation 3 mode.
5-1) Here, the Buzzer will perform alarm with a beep sound.
5-2) When forced operation is selected, the Comp. will immediately work without the 15-minute delay in any operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and forced operation will be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be careful.)
5-3) When forced operation is selected, the Comp. and the R-Fan will continuously work for 24 hours, the F-Valve will be
closed, and the F-Fan will be OFF.
5-7) During forced operation, the alarm will sound until the forced operation will be ended, and you can cancel the Forced
Operation 3 by repressing the Test button in the Forced Operation 3 status.
6. In the Forced Operation 3 status, if you press the Test button again, the Forced Operation 3 will be immediately canceled,
and the product will enter the Forced R Defrosting mode.
6-1) Here, a beep alarm sound will be made for three seconds from when you enter the mode, and continue to be made by
being ON for 0.1 seconds and being OFF for 0.9 seconds in the Forced R Defrosting mode.
7. If you press the Test button again in the Forced R Defrosting status, the Forced R Defrosting will be immediately canceled,
and the product will enter the Forced FR Defrosting mode.
7-1) Here, a beep alarm sound will be made for three seconds from when you enter the mode, and continue to be made by
being ON for 0.5 seconds and being OFF for 0.5 seconds in the Forced FR Defrosting mode.

[Reference]
Dead zone : If do not set a specific Notch, set between Notch, It is recognized as not the middle value but abnormal
range. This is called Dead zone.

※REFERENCE : TEST OPERATION BLOCK DIAGRAM (TEST MODE)

NORMAL Forced Forced Forced Forced R Forced F/R

OPERATION Operation 1 Operation 2 Operation 3 Defrosting Defrosting

TEST KEY
INPUT

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TROUBLESHOOTING

4-1-1-2. TEST MODE Description

4-1-1-2-1. Forced Operation 1 mode

1-1) If you press any button once in the Test Mode, the product will enter the Forced Operation 1 mode.
When the product enters the Forced Operation 1 mode, the Panel Display will display the LEDs from
Weak, Weak Middle, Middle, and Middle Strong to Strong of the F/R Compartments.
Here, the Buzzer will perform alarm with a beep sound.
1-2) When forced operation is selected, the Comp. will immediately work without the 15-minute delay in any
operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and forced operation will
be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be
careful.)
1-3) When forced operation is selected, the Comp. and the F-Fan continues to operate for 24 hours, and the
R Compartment will work by the set temperature.
1-4) When forced operation is selected, the set temperature will be automatically selected to be -23℃ for
the Freezer and 1℃ for the Fridge.
1-5) During forced operation, the Power Freeze and Power Cool functions will not work.
(All the buttons function normally)
If the function is selected, the Power mode icon will be automatically turned OFF in about 10 seconds.
1-6) If you select the forced defrosting or the test cancellation when one minute has not passed after you
have selected forced operation, the set temperature will be changed into the previous set temperature.
1-7) During forced operation, the alarm sound will not stop until the forced operation is finished.

[Note] Models with the Rotary Switch operate the same as the above with the Forced Operation Mode on.

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TROUBLESHOOTING

4-1-1-2-2. Forced Operation 2

2-1) If you press any button twice in the Test mode, the product will enter the Forced Operation 2 mode.
When the product enters the Forced Operation 2 mode, the Panel Display will display the LEDs from
Weak and Weak Middle to Middle of the F/R Compartments.
Here, the Buzzer will perform alarm with a beep sound.
2-2) When forced operation is selected, the Comp. will immediately work without the 15-minute delay in any
operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and forced operation will
be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be
careful.)
2-3) When forced operation is selected, the Comp. and the F-Fan will continuously work for 24 hours, the
R-Valve will be closed, and the R-Fan will be OFF.
2-4) When forced operation is selected, the set temperature will be automatically selected to be -23℃ for
the Freezer and 1℃ for the Fridge.
2-5) During forced operation, the Power Freeze and Power Cool functions will not work.
(All the buttons function normally)
If the function is selected, the Power mode icon will be automatically turned OFF in about 10 seconds.
2-6) If you select the forced defrosting or the test cancellation when one minute has not passed after you
have selected forced operation, the set temperature will be changed into the previous set temperature.
2-7) During forced operation, the alarm sound will not stop until the forced operation is finished.

[Note] Models with the Rotary Switch operate the same as the above with the Forced Operation Mode on.

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TROUBLESHOOTING

4-1-1-2-3. Forced Operation 3 mode

3-1) If you press any button three times in the Test mode, the product will enter the Forced Operation 3
mode.
When the product enters the Forced Operation 3 mode, the Panel Display will display the LEDs of Weak
and Weak Middle of the F/R Compartments.
Here, the Buzzer will perform alarm with a beep sound.
3-2) When forced operation is selected, the Comp. will immediately work without the 15-minute delay in any
operation mode.
Here, if the product is defrosting, the defrosting will be immediately stopped, and forced operation will
be performed.
(If forced operation is performed immediately when the Comp. is OFF, overload may occur, so be
careful.)
3-3) When forced operation is selected, the Comp. and the R-Fan will continuously work for 24 hours, the
F-Valve will be closed, and the F-Fan will be OFF.
3-4) When forced operation is selected, the set temperature will be automatically selected to be -23℃ for
the Freezer and 1℃ for the Fridge.
3-5) During forced operation, the Power Freeze and Power Cool functions will not work.
(All the buttons function normally)
If the function is selected, the Power mode icon will be automatically turned OFF in about 10 seconds.
3-6) If you select the forced defrosting or the test cancellation when one minute has not passed after you
have selected forced operation, the set temperature will be changed into the previous set temperature.
3-7) During forced operation, the alarm sound will not stop until the forced operation is finished.

[Note] Models with the Rotary Switch operate the same as the above with the Forced Operation Mode on.

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TROUBLESHOOTING

4-1-1-2-4. Forced R Defrosting mode

4-1) In the Forced Operation 3 status of Test Mode, if you press any button once more, the Forced Operation
3 will be immediately canceled, and the product will enter the Forced R Defrosting mode.
When the product enters the Forced R Defrosting mode, the Panel Display will display the LEDs of Weak
Middle and Middle of the F/R Compartments.
4-2) Here, a beep alarm sound will be made for three seconds from when you enter the mode, and continue
to be made by being ON for 0.1 seconds and being OFF for 0.9 seconds in the Forced R Defrosting
mode.

[Note] Models with the Rotary Switch operate the same as the above with the Forced Operation Mode on.

4-1-1-2-5. Forced FR Defrosting mode

5-1) In the Forced R Defrosting status of Test Mode, if you press any button once more, the Forced R
Defrosting will be immediately canceled, and the product will enter the Forced FR Defrosting mode.
When the product enters the Forced FR Defrosting mode, the Panel Display will display the LED of
Middle of the F/R Compartments.
5-2) Here, a beep alarm sound will be made for three seconds from when you enter the mode, and continue
to be made by being ON for 0.5 seconds and being OFF for 0.5 seconds in the Forced FR Defrosting
mode.

[Note] Models with the Rotary Switch operate the same as the above with the Forced Operation Mode on.

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TROUBLESHOOTING

4-1-2. Self-Diagnosis Function

4-1-2-1. For Models with Electronic Displays

1) Self-Diagnosis mode (when it's turned on initially)

1-1) When the power is initially applied to the Refrigerator, the Micom determines whether the Temperature
Sensor is out of order or not within a few seconds.
1-2) If a defective sensor is discovered as a result of the self-diagnosis, all the pertinent display LEDs will
flicker with the interval of 0.5 seconds.
Here, no beep sound will be made. (Refer to the Check List for Self-Diagnosis)
1-3) When a defective sensor is discovered and the error found by self-diagnosis is displayed, only the
self-diagnosis button will be recognized and normal display will not work. However, the temperature will
be controlled by emergency operation.
1-4) To cancel the error code, fix the failure of the defective sensor or cancel the Initial Self-Diagnosis
Function by pressing the Freezer KEY and the Fridge KEY buttons for 13 seconds.

2) Self-Diagnosis in Normal Operation

2-1) If you press the Freezer + Fridge button simultaneously for 13 seconds or longer in the normal operation
mode, a buzzer sound ("Ding-dong") will be made, and the Self-Diagnosis mode will be selected.
2-2) When the product enters the Self-Diagnosis mode, all LEDS will be OFF, and if there is an error, the
error display will last for 60 seconds, and after that, the product will return to the normal status.
(A buzzer sound "Ding-Dong" will be made.) (Refer to the Check List below for Self-Diagnosis)
2-3) Input by button is not accepted when the Self-Diagnosis mode is on.

HOLD 13 SEC HOLD 13 SEC

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TROUBLESHOOTING

①E
 RROR DISPLAY
(Refer to Self-Diagnosis
Check List below)

※ Self-Diagnosis Check List

NO Item Display Description Image

"-23℃" LED When defrosting is ended

1 F-DEF
Lamp by time

"-21℃" LED
2 EXT-SENSOR Open/Short error
Lamp

"-19℃" LED
3 F-SENSOR Open/Short error
Lamp

"-17℃" LED
4 R-SENSOR Open/Short error
Lamp

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TROUBLESHOOTING

NO Item Display Description Image

"-15℃" LED
5 R-DEF SENSOR Open/Short error
Lamp

6 F-FAN ERROR "1℃" LED Lamp F-FAN constraint error

ICE Off Ice Making Sensor Error

Ice Maker Function Error
7 ICE Maker Error
Ice Maker Water Supply
( ) LED Pipe Heater Error

Comp start failure error

Comp IPM Fault Error

Comp location detection error

8 Comp Error "3℃" LED Lamp
Comp motor constraint error

Comp low voltage error

Comp over voltage error

Vacation
9 R-DEF SENSOR Open/Short error
( ) LED

Power Freeze
10 R-FAN ERROR R-FAN constraint error
( ) LED

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TROUBLESHOOTING

Self-Diagnosis Error Description

NO Error Code Item Description Trouble Shooting Image

The voltage between MAIN PCB

1 F-SENSOR CN30-"3(GRN) ↔ 1(WHT)" should
be within 4.5V~0.5V.

The voltage between MAIN PCB

2 R-SENSOR CN30-"5(BLU) ↔ 1(WHT)" should be
within 4.5V~0.5V.

Separation of sensor
housing part, contact error,
disconnection, short circuit.
The voltage between MAIN PCB
F - DEF - The failure by temperature
3 CN30-"4(YEL) ↔ 1(WHT)" should be
SENSOR is displayed when the
within 4.5V~0.5V.
temperature sensed by the
sensor is +65℃ or higher or
-50℃ or lower.

The voltage between MAIN PCB

R - DEF -
4 CN30-"6(RED) ↔ 1(WHT)" should be
SENSOR
within 4.5V~0.5V.

The voltage between MAIN PCB

EXT -
5 CN30-"2(WHT) ↔ 1(WHT)" should
SENSOR
be within 4.5V~0.5V.

The voltage between MAIN PCB

F-FAN
6 CN75-"4(YEL) ↔ 1(GRY)" should be
ERROR
within 7V~12V.
When the related Fan Motor
operates, it occurs if the
contact of the Feed Back
Signal Wire is defective, the
Motor Wire is slipped out or
the Motor is defective.
The voltage between MAIN PCB
R-FAN
7 CN75-"3(ORG) ↔ 1(GRY)" should be
ERROR
within 7V~12V.

36
TROUBLESHOOTING

NO Error Code Item Description Trouble Shooting Image

It occurs when the failure
is about the separation of
the Housing related to the
F Compartment Defrosting
Heater, contact error,
disconnection, short circuit, The voltage between MAIN PCB
F-DEF
8 or the failure of Temperature CN30-"4(YEL) ↔ 1(WHT)" should be
ERROR
Fuse. within 4.5V~0.5V.
The failure is displayed
when defrosting of the F
Compartment does not end
even after nonstop heating for
150 minutes or longer.

WATER
The voltage between MAIN PCB
PIPE Separation of sensor
9 CN30-"3(GRN) ↔ 1(WHT)" should
HEATER housing part, contact error, be within 4.5V~0.5V.
ERROR disconnection, short circuit.
The failure by temperature
is displayed when the
temperature sensed by the
sensor is +65℃ or higher or
-50℃ or lower.
ICE MAKER **Applies only to the models The voltage between MAIN PCB
10 SENSOR with Ice Maker CN30-"3(GRN) ↔ 1(WHT)" should
ERROR be within 4.5V~0.5V.

ICE MAKER SENSOR ERROR

ICE MAKER
ICE MAKER FUNCTION ERROR After replacing the Ice Maker, plug
11 Function
**Applies only to the models in the unit and check its operation.
ERROR
with Ice Maker

37
TROUBLESHOOTING

NO Error Code Item Description Trouble Shooting Image

COMP The error code is displayedCheck the soldering status of the
12 Run failure when the compressor has inverter PCB.
ERROR failed to start. (Check if any parts have short-
circuited).
COMP IPM The error code is displayed Check if the DC 16V output is less
13 FAULT when the compressor IPM fault than 1 3.5V.
ERROR error has occurred. Check the Comp and Cycle.

Check the compressor wire

Comp
connections.
Abnormal The error code is displayed Check the soldering status of the
14 Current when the compressor location inverter PCB.
Detection detection failed. (Check if any parts have short-
circuited).
Error
Check the Comp and Cycle.
Check if the compressor and the
Comp Cycle is normal. Check the input
motor The error code is displayed voltage.
15 when the compressor motor is Check the soldering of the inverter
constraint constrained. PCB.
error (Check if any parts have short-
circuited.)
COMP Low The error code is displayed Check the input voltage. (This error
16 Voltage when the AC Input Voltage is occurs when the input voltage is AC
ERROR too low. 106 V or lower.)

COMP Over The error code is displayed Check the input voltage.
17 Voltage when the AC Input Voltage is (This error occurs when the input
ERROR too high. voltage is AC 310V or higher.)

38
TROUBLESHOOTING

4-1-2-2. Models with ROTARY S/W

1. When the unit is plugged in, it will diagnose all its components to check if there are any defect parts.
And when there is any defect part, the ERROR MODE DISPLAY LED LAMP will blink according to the LED
Blinking Frequency in the below table. And, at the end of each blinking cycle, there is a two-second
interval (Downtime).
2. When the unit is plugged in, it will also diagnose if there are any multiple parts or loads failures. If so, the
ERROR MODE DISPLAY LED LAMP will blink according to the LED Blinking Frequency in the below table.
And, at the end of each blinking cycle, there is a two-second interval (Downtime).

(552502'(',63/
$</('/$03

LED
No Blinking Item Trouble Shooting
Frequency
1 1 Times F-Sensor Open/Short error

2 Twice F-DEF SENSOR Open/Short error

3 3 times EXT-SENSOR Open/Short error

4 4 times F-Rotary Open/Short error

5 5 times F-DEF When defrosting is ended by time

6 6 times R-SENSOR Open/Short error

7 7 times R-DEF SENSOR Open/Short error

8 8 times R-Rotary Open/Short error

Comp start failure error

Comp IPM Fault Error

Comp location detection error

9 10 times Comp Error
Comp motor constraint error

Comp low voltage error

Comp over voltage error

10 11 times F-FAN ERROR F-FAN constraint error

11 12 times R-FAN ERROR R-FAN constraint error

39
TROUBLESHOOTING

Self-Diagnosis Error Description

LED
NO Blinking Item Description Trouble Shooting
Frequency
Connector Slipped-Out or Open-Contact,
The voltage between MAIN PCB CN30-
Wire Cut or Short-Circuited, Abnormal
1 1 Times F-Sensor "4(RED) ↔ 7(Gray)" should be within
Sensing Temp (higher than +65℃ or lower
4.5V~0.5V.
than -50℃)
Connector Slipped-Out or Open-Contact,
The voltage between MAIN PCB CN30-
Wire Cut or Short-Circuited, Abnormal
2 Twice F-DEF -SENSOR "4(RED) ↔ 7(Gray)" should be within
Sensing Temp (higher than +65℃ or lower
4.5V~0.5V.
than -50℃)
Connector Slipped-Out or Open-Contact,
The voltage between MAIN PCB CN31-
Wire Cut or Short-Circuited, Abnormal
3 3 Times EXT-SENSOR "1(WHT) ↔ 2(WHT)" should be within
Sensing Temp (higher than +65℃ or lower
4.5V~0.5V.
than -50℃)
PBA-Rotary Switch Slipped-Out or Open- The voltage between MAIN PCB CN30-
4 4 Times F-Rotary ERROR Contact, Wire Cut or Short-Circuited,Switch "3(BRN)↔ 7(Gray)" should be within
Part Defect 4.5V~0.5V.
[ Freezer Defrost Heater ] Remove the MAIN PCB CN70 and CN77
Connector Slipped-Out or Open-Contact, connectors from the MAIN PCB and read the
Wire Cut or Short-Circuited, Defective continuity between BROWN ↔ ORG wires. (It
5 5 Times F-DEF-ERROR Thermistor differs according to the energy consumption.)
Freezer Defrost When the defrosting does When it reads 0 Ohm, check the Heater
not complete even after it does defrosting for short and when it reads ∞ Ohm, check if the
more than 120 minutes. Wire/Thermal Fuse or the Bimetal is Open.
Connector Slipped-Out or Open-Contact,
The voltage between MAIN PCB CN30-
Wire Cut or Short-Circuited, Abnormal
6 6 Times R-SENSOR "5(ORG) ↔ 7(Gray)" should be within
Sensing Temp (higher than +65℃ or lower
4.5V~0.5V.
than -50℃)
Connector Slipped-Out or Open-Contact,
R-DEF SENSOR Wire Cut or Short-Circuited, Abnormal The voltage between MAIN PCB CN30-
7 7 Times "5(ORG) ↔ 7(Gray)" should be within
ERROR Sensing Temp (higher than +65℃ or lower
4.5V~0.5V.
than -50℃)
PBA-Rotary Switch Slipped-Out or Open- The voltage between MAIN PCB CN30-
8 9 Times R-Rotary Error Contact, Wire Cut or Short-Circuited,Switch "3(BRN)↔ 7(Gray)" should be within
Part Defect 4.5V~0.5V.
Comp start failure The error code is displayed when the Check the soldering status of the inverter
error compressor has failed to start. PCB. (Check if any parts have short-
Compressor IPM The error code is displayed when the circuited). Check if the DC 16V output is less
Fault Error compressor IPM fault error has occurred. than 13.5V. Check the Comp and Cycle.
Check the compressor wire connections. Check the
Comp location The error code is displayed when the soldering status of the inverter PCB. (Check if any
detection error compressor location detection failed. parts have short-circuite d). Check the Comp and
9 10 Times Cycle.
Check if the compressor and the Cycle is
Comp motor The error code is displayed when the normal. Check the input voltage.
constraint error compressor motor is constrained. Check the soldering of the inverter PCB.
(Check if any parts have short-circuited.)
Comp low voltage The error code is displayed when the AC Check the input voltage. (This error occurs
error Input Voltage is too low. when the input voltage is AC 106 V or lower.)
Comp over The error code is displayed when the AC Check the input voltage. (This error occurs
voltage error Input Voltage is too high. when the input voltage is AC 310V or higher.)
When the related Fan Motor operates, it
occurs if the contact of the Feed Back Signal The voltage between MAIN PCB CN72-
10 11 Times F-FAN ERROR
Wire is defective, the Motor Wire is slipped "9(PNK) ↔ 10(GRY)" should be within 7V~12V
out or the Motor is defective.
When the related Fan Motor operates, it
occurs if the contact of the Feed Back Signal The voltage between MAIN PCB CN72-
11 12 Times R-FAN ERROR
Wire is defective, the Motor Wire is slipped "9(PNK) ↔ 10(GRY)" should be within 7V~12V
out or the Motor is defective.

40
TROUBLESHOOTING

4-1-3. Load Status Display Function

1) If the Freezer + Fridge buttons are pressed simultaneously for about seven seconds during normal
operation mode, the Panel Display will turn ON/OFF the LEDs of Weak Middle, Middle, and Middle Strong
for about four seconds.
2) Here, if you take your fingers off the buttons and press the Fridge button (a "Ding-Dong" sound will be
made and), the mode will be converted into the Load Status Display Function.
3) The Load Status Display function lets you know what the load for the current output of the Micom signal is.
However, it just means that the Micom signal is outputted, and does not confirm whether the load is
actually working or not.
That is, even if it displays that the load is working, the load may not be working because of a disorder of
the actual load or a faulty Relay on the PCB.
(You need to check.)
4) The Load Status Display Function lasts only for 30 seconds, and the product will automatically return to the
normal status after that.
5) The display of each load status is as follows:

① ② ① ②

① Press the Freezer + Fridge buttons simultaneously for six seconds.

② When the Display (Weak Middle, Middle, and Middle Strong) starts blinking, press the Fridge button once.

41
※ Load Mode Check List
NO Item Display Description

1 COMP When the Comp works

2 F-DEF Heater When the F-DEF Heater works

3 Water Pipe Heater When the Water Pipe Heater works

4 Overload When the ambient temperature is 34℃

5 Low temperature When the ambient temperature is 23℃

6 Exhibition mode In Exhibition mode

7 F-Fan High F-Fan High

8 F-Fan Low F-Fan Low

9 F-Valve In case the F-Valve is open, the pertinent LED blinks.

10 R-Valve In case the R-Valve is open, the pertinent LED blinks.

11 R-Fan High R-Fan High

12 R-Fan Low R-Fan Low

13 Ice Full Full-ice level reached.

14 Normal When the ambient temperature is between 24-33℃

TROUBLESHOOTING

4-1-4. Operation Status Recovery Function in Case of Blackout

1) When the Panel Display is initialized in case of a temporal blackout, a non-sense call by consumers may
occur.
In order to prevent this, the product senses the temperature inside the Refrigerator at the point when the
power is applied and initializes or recovers the existing operation status.
2) When the power is initially ON, the product senses the temperature inside the Freezer, Fridge, Freezer
Defrosting Sensor, and of the Fridge Defrosting Sensor. If at least one from among the four temperatures
is less than about +12℃, the product regards this as a temporal blackout during operation, and recovers
the functions related to the Panel Display (Power Freeze, Power Cool, Fridge, Freezer, Door Alarm, Lock
function, etc.).
3) When the power is initially ON, the product senses the temperature inside the Freezer, Fridge, Freezer
Defrosting Sensor, and of the Fridge Defrosting Sensor. If all the four temperatures are about +12℃ or
higher, the product regards this as a blackout for a long time, and initializes the Panel Display.
(The temperature of the Freezer is -19℃. The temperature of the Fridge is 3℃. The Door Alarm ON is
automatically set.)

4-1-5. Exhibition Mode Setting Function

1) If the Freezer + Fridge buttons are pressed simultaneously for about seven seconds during normal
operation mode, the Panel Display will turn ON/OFF the LEDs of Weak Middle, Middle, and Middle Strong
for about four seconds.
2) Here, if you take your fingers off the buttons and press the Freezer button, (a "Ding-Dong" sound will be
made and) the product will be converted into the Exhibition mode.
3) When the Exhibition Mode is set, the Display and all functions will normally work, and only the Compressor
won't start.
4) The Exhibition Mode will be canceled if you press the Exhibition Mode button again or turn OFF the power.
5) During the Exhibition Mode, when the temperature of the Freezer or the Fridge increases to be 65 ℃ or
higher, the Exhibition Mode will be canceled, and the product will enter the cooling operation condition.

② ① ② ①

① Press the Freezer + Fridge buttons simultaneously for seven seconds.

② When the Display starts blinking, press the Freezer button once.

43
TROUBLESHOOTING

4-1-6. Option Setting Function

1) During the Normal Operation, press the Freezer + Fridge buttons for 4 seconds.
Then, the entire Display Panel will blink at the interval of 0.5 seconds for 3 seconds.
2) At this time, release the Freezer + Fridgel buttons and press the Power Cool button (it sends out "Ding
Dong" sound.) Then, it shifts to the Option Setting Mode.
● When there is no button press for 20 seconds at the Option Setting Mode, it will go back to the normal
display mode.

① ② ① ②

① Press the Freezer + Fridge buttons for 4 seconds at the same time.
Then, the Display LEDs will blink for 3 seconds. At this time, release the buttons
② and, press the Fridge button once.

44
TROUBLESHOOTING

Option Mode & Button Control Description

④ ③
④ ③

② ① ② ①

①  isplay the selected Option Set Value

D
② Display the selected Option #
③ OPTION SET VALUE INCREASE BY DEGREE (Rotation Type)
④ OPTION # INCREASE BY ONE (Rotation Type)

● The Bar Type Display Panel shows the numbers as shown in the following tables (Binary Type)
Value
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
F R
-23℃ 1℃                
-21℃ 2℃                
-19℃ 3℃                
-17℃ 5℃                
-15℃ 7℃                

Value
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
F R
-23℃ 1℃                
-21℃ 2℃                
-19℃ 3℃                
-17℃ 5℃                
-15℃ 7℃                

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TROUBLESHOOTING

● When the Display Panel converts to the Option Setting mode, the entire Display except the Freezer and
the Fridge Temperature LEDs as shown below Temp LED goes off.

Freezer Temp Setting Fridge Temp Setting

1) For example, if you want to shift the standard temp of the Freezer compartment by -2℃, follow the steps
below. This function is to change the default temperature and when the default temperature of the Freezer
compartment is -21℃ and the default setting is lowered by -2℃ with the Option function, the default
temperature will be controlled at -23℃. That is, when changing temperature options, the Freezer
compartment will operate at -23℃ internally even if it shows -21℃ on the display panel. Therefore, the
temperature will be controlled by -2℃ lower than the set temperature on the display panel.

Note Basically, when units being shipped out, all the data in the Option function are cleared. That is, the
Default settings are “0”. However, for the purpose of quality improvement during mass production, the
Default values may change. Therefore, be sure to check quality information, such as SVC bulletins.

2) After changing into the Option mode,“0" on both of the Fridge and Freezer compartments lights up on the
display panel. (when units being shipped out, the unit will be shipped out with "0"s set on both of the
Fridge and Freezer compartments. However, for the purpose of quality improvement during mass
production, the Default values may change.)

- When the Fridge Display set to the status of the Option #0, it will be set to the Freezer Temperature
Option and the current Freezer Temperature Set Value will be shown on the Freezer Temperature Display
(Refer to the Freezer Temp Shifting Image).
3) When "4" is set as shown in the Freezer Option Table below after setting the Fridge Option # to "0", the
Freezer default temperature will decrease by -2℃. (Refer to the Freezer Temp Shift Figure)
:In 20 seconds after completing the adjustment, MICOM is to store the setting value in EEPROM and it
goes back to the normal display mode, deactivating the Option Setting mode.
5) The Fridge temperature can be adjusted with the same method.
6) Make sure not to change the factory-set default values excluding exceptional circumstances.
Also, the Option Setting will be completed when it goes back to the normal display mode in 20 seconds.
So, do not turn off the unit before it goes back to the normal display mode.

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TROUBLESHOOTING

4-1-7. Option Table

Note There are other option setting functions. But, it's got to do with the performance of the unit, not for
repair purposes. So, they are not handled in this manual.
(Except those described in this manual, do not change other values.)

1) Freezer Temp Shift Table

Setting Item Freezer Temp Shift

Location : Fridge Temp LED
Option Item
0

Setting Value
Freezer Temp Display Option Value
Panel Set Value
0 0
1 -0.5℃
2 -1.0℃
3 -1.5℃
4 -2.0℃
5 -2.5℃
6 -3.0℃
7 -3.5℃
8 +0.5℃
9 +1.0℃
10 +1.5℃
11 +2.0℃
12 +2.5℃
13 +3.0℃
14 +3.5℃
15 +4.0℃

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TROUBLESHOOTING

2) Fridge Temp Shift Table

Setting Item Fridge Temp Shift

Location : Fridge Temp Display
Option Item
1

Setting Value
Freezer Temp Display Option Value
Panel Set Value
0 0
1 -0.5℃
2 -1.0℃
3 -1.5℃
4 -2.0℃
5 -2.5℃
6 -3.0℃
7 -3.5℃
8 +0.5℃
9 +1.0℃
10 +1.5℃
11 +2.0℃
12 +2.5℃
Ex) When shifting the Fridge default temp by +2.0℃
13 +3.0℃
14 +3.5℃
15 +4.0℃

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TROUBLESHOOTING

3) Display ON/OFF Control Table

Setting Item Display On/Off Control

Location : Fridge Temp Display
Option Item
16

Setting Value
Freezer Temp Option Value
Display Panel
Set Value
0 Display OFF
1 Always Display On
2 Always Display On

Ex) When canceling the Display OFF mode

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TROUBLESHOOTING

3) Temp Shift (F-Convert [F-Fridge/F-OFF] mode) Table

Setting Item F Convert Room Shift

Location : Fridge Temp Display
Option Item
20

Setting Value
Freezer Temp Display Option Value
Panel Set Value
0 0
1 -0.5℃
2 -1.0℃
3 -1.5℃
4 +0.5℃
5 +1.0℃
6 +1.5℃
7 +2.0℃

Ex) W
 hen lowering the default temperature by 0.5℃ in
F-Convert mode

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TROUBLESHOOTING

5) Change in Water Supply Table (Ice Maker)

Setting Item Change in Water Supply for the Ice Maker

Location : Fridge Temp Display
Option Item
2

Setting Value
Freezer Temp Option Value
Display Panel
Set Value
0 5.9 seconds

1 6.4 seconds

Ex) When increasing the water supply for the Ice Maker
(Time spent: 5.9 Sec. -> 6.4 Sec.)

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TROUBLESHOOTING

6) Waiting Time Table for Separating Ice in Ice Maker

Changing Waiting Time for Separating Ice in

Setting Item
Ice Maker
Location : Fridge Temp Display
Option Item
3

Setting Value
Freezer Temp Display Option Value
Panel Set Value
0 90
1 91
2 92
3 93
4 94
5 95
6 96
7 97
8 98
9 99
10 100
11 89
12 88
Ex) When extending the waiting time by five minutes
13 87
14 86
15 85

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TROUBLESHOOTING

7) Temperature Setting Table for Separating Ice in Ice Maker

Setting Temperature for Separating Ice in

Setting Item
Ice Maker
Location : Fridge Temp Display
Option Item
4

Setting Value
Freezer Temp Display Option Value
Panel Set Value
0 -15.0℃
1 -14.0℃
2 -13.0℃
3 -12.0℃
4 -11.0℃
5 -16.0℃
6 -17.0℃
7 -18.0℃

Ex) W
 hen lowering the separating temperature by
3.0℃ against the default value

53
TROUBLESHOOTING

4-2. Troubleshooting Flow-Chart by Symptoms

DATA1.Temp Table
Conversion Table - Temperature/MICOM PORT Voltage/Resistance
SENSOR CHIP : PX41C

℃ ℉ Voltage Ω ℃ ℉ Voltage Ω ℃ ℉ Voltage Ω

-50 -58 4.694 153319 -5 23 3.107 16419 40 104 1.153 2997
-49 -56.2 4.677 144794 -4 24.8 3.057 15731 41 105.8 1.124 2899
-48 -54.4 4.659 136798 -3 26.6 3.006 15076 42 107.6 1.095 2805
-47 -52.6 4.641 129294 -2 28.4 2.955 14452 43 109.4 1.068 2714
-46 -50.8 4.622 122248 -1 30.2 2.904 13857 44 111.2 1.040 2627
-45 -49 4.602 115631 0 32 2.853 13290 45 113 1.014 2543
-44 -47.2 4.581 109413 1 33.8 2.802 12749 46 114.8 0.988 2462
-43 -45.4 4.560 103569 2 35.6 2.751 12233 47 116.6 0.963 2384
-42 -43.6 4.537 98073 3 37.4 2.700 11741 48 118.4 0.938 2309
-41 -41.8 4.514 92903 4 39.2 2.649 11271 49 120.2 0.914 2237
-40 -40 4.490 88037 5 41 2.599 10823 50 122 0.891 2167
-39 -38.2 4.465 83456 6 42.8 2.548 10395 51 123.8 0.868 2100
-38 -36.4 4.439 79142 7 44.6 2.498 9986 52 125.6 0.846 2036
-37 -34.6 4.412 75077 8 46.4 2.449 9596 53 127.4 0.824 1973
-36 -32.8 4.385 71246 9 48.2 2.399 9223 54 129.2 0.803 1913
-35 -31 4.356 67634 10 50 2.350 8867 55 131 0.783 1855
-34 -29.2 4.326 64227 11 51.8 2.301 8526 56 132.8 0.762 1799
-33 -27.4 4.296 61012 12 53.6 2.253 8200 57 134.6 0.743 1745
-32 -25.6 4.264 57977 13 55.4 2.205 7888 58 136.4 0.724 1693
-31 -23.8 4.232 55112 14 57.2 2.158 7590 59 138.2 0.706 1642
-30 -22 4.199 52406 15 59 2.111 7305 60 140 0.688 1594
-29 -20.2 4.165 49848 16 60.8 2.064 7032 61 141.8 0.670 1547
-28 -18.4 4.129 47431 17 62.6 2.019 6771 62 143.6 0.653 1502
-27 -16.6 4.093 45146 18 64.4 1.974 6521 63 145.4 0.636 1458
-26 -14.8 4.056 42984 19 66.2 1.929 6281 64 147.2 0.620 1416
-25 -13 4.018 40938 20 68 1.885 6052 65 149 0.604 1375
-24 -11.2 3.980 39002 21 69.8 1.842 5832 66 150.8 0.589 1335
-23 -9.4 3.940 37169 22 71.6 1.799 5621 67 152.6 0.574 1297
-22 -7.6 3.899 35433 23 73.4 1.757 5419 68 154.4 0.560 1260
-21 -5.8 3.858 33788 24 75.2 1.716 5225 69 156.2 0.546 1225
-20 -4 3.816 32230 25 77 1.675 5039 70 158 0.532 1190
-19 -2.2 3.773 30752 26 78.8 1.636 4861 71 159.8 0.519 1157
-18 -0.4 3.729 29350 27 80.6 1.596 4690 72 161.6 0.506 1125
-17 1.4 3.685 28021 28 82.4 1.558 4526 73 163.4 0.493 1093
-16 3.2 3.640 26760 29 84.2 1.520 4369 74 165.2 0.481 1063
-15 5 3.594 25562 30 86 1.483 4218 75 167 0.469 1034
-14 6.8 3.548 24425 31 87.8 1.447 4072 76 168.8 0.457 1006
-13 8.6 3.501 23345 32 89.6 1.412 3933 77 170.6 0.446 978
-12 10.4 3.453 22320 33 91.4 1.377 3799 78 172.4 0.435 952
-11 12.2 3.405 21345 34 93.2 1.343 3670 79 174.2 0.424 926
-10 14 3.356 20418 35 95 1.309 3547 80 176 0.414 902
-9 15.8 3.307 19537 36 96.8 1.277 3428 81 177.8 0.404 877
-8 17.6 3.258 18698 37 98.6 1.253 3344 82 179.6 0.394 854
-7 19.4 3.208 17901 38 100.4 1.213 3204 83 181.4 0.384 832
-6 21.2 3.158 17142 39 102.2 1.183 3098 84 183.2 0.375 810

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TROUBLESHOOTING

4-2-1. When Self-Diagnosis Error occurs

-T  he Display Panel shows the Sensor Error and, when the unit is plugged in and there are sensor errors,
the unit does not operate and Display bar related to the defective sensors keep blinking.
- When sensor defects occur during the operation, the unit keeps working. But, it shifts to the Emergency
Operation and it may not work properly. So, please check the unit according to the Self Diagnosis function.

1) When the R-Sensor is defective

ERROR CODE

Start

MAIN PCB Connector No

CN30 is inserted properly?

Yes Connector contact defect /

Reconnect

R Sensor is No
DATA1. Temp Table normal?

Yes
** Sensor Resistance Reading Location ** Replace Temp Sensor
R : R:Between CN31 #7 and #8
** 0Ω : Short / ∞Ω : Open Voltage between NO(Value < 0.6V or Value > 4.6V)
MAIN PCB Connector CN31 #7 and
CN31 #8?
Refer to Circuit Diagram
Yes Check the wire connection
Sensor MICOM/Connector #
Input Voltage at IC10 No
R R:Between CN31 #7 and #8 MICOM PIN #54 is normal?

Yes Check Soldering Defect & Short

Voltage : Between 4.6V ~ 0.6V
PCB and Temp Sensor are normal.
Voltage at IC10 MICOM #54 Check the connector contact.
is the same as the value
between CN31 #7 and
CN31 #8

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TROUBLESHOOTING

2) When the R-DEF-sensor is defective

ERROR CODE

Start

MAIN PCB CN31 Connector No

is inserted properly?

Yes Connector contact defect /

Reconnect

No
DATA1. Temp Table R-DEF-Sensor is normal?

Yes Replace Temp Sensor

**Sensor Resistance Reading Location**
**R-DEF : Between CN31 #3 and #4
**Located in the PCB Box
**0Ω : Short / ∞Ω : Open Voltage between Main PCB connector NO(Value < 0.6V or Value > 4.6V)
CN31-”3” and CN31-”4”?
Refer to Circuit Diagram
Yes Check the wire connection
Sensor MICOM/Connector #
Between Connector Input voltage at IC10 Micom No
R-DEF CN31 –”3” Pin #50 is normal?
and CN31-”4”
Yes Check Soldering Defect & Short
Voltage : Between 4.6V ~ 0.6V
PCB and Temp Sensor are normal.
Voltage at IC10 #50 is the Check Connector contact.
same as the value between
CN31-”3” and CN31-”4” on
Main PBA

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TROUBLESHOOTING

3) When the EXT-Sensor is defective

ERROR CODE

Start

MAIN PCB Connector No

CN31 is inserted properly?

Yes Connector contact defect / Reconnect

DATA1. Temp Table
EXT Sensor is No
normal?
** Sensor Resistance Reading Location **
EXT : Between CN32 #1 and #2. Yes Replace Temp Sensor
** Located in the PCB Box
** 0Ω : Short / ∞Ω : Open
Voltage between
No NO(Value < 0.6V or Value > 4.6V)
Main PCB Connector CN32 – “1” and CN32-2 of
CN32 on Main PBA
Refer to Circuit Diagram
Yes Check the wire connection
Sensor MICOM/Connector #
Between Connector CN32- Input Voltage at IC10 No
EXT "1"(YEL) and CN32- MICOM Pin #55 is normal?
"2"(YEL)
Yes Check Soldering Defect & Short
Voltage : Between 4.6V ~ 0.6V
PCB and Temp Sensor are normal.
Voltage at IC10 MICOM #55 Check the connector contact.
is the same as the value
Between CN32 – “1” and
CN32-2 of CN32 on Main
PBA

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TROUBLESHOOTING

4) When the F-sensor is defective

ERROR CODE

Start

MAIN PCB Connector No

CN31 is inserted properly?

Yes Connector contact defect / Reconnect

DATA1. Temp Table
No
R-DEF-Sensor is normal?
**Sensor Resistance Reading Location**
**R-DEF : Between CN30 #7 and #8
Yes
**Located in the PCB Box Replace Temp Sensor
**0Ω : Short / ∞Ω : Open

Voltage between Main PCB connector No NO(Value < 0.6V or Value > 4.6V)
CN30-”7” and CN30-”8”?
Refer to Circuit Diagram
Yes Check the wire connection
Sensor MICOM/Connector #
Between Connector Input voltage at IC10 Micom No
R-DEF
CN30 –”7” and CN30-”8” Pin #52 is normal?
Voltage : Between 4.6V ~ 0.6V Yes Check Soldering Defect & Short

PCB and Temp Sensor are normal.

Check the connector contact.
Voltage at IC10 #50 is the
same as the value between
CN30-”7” and CN30-”8” on
Main PBA

58
TROUBLESHOOTING

5) When the DEF-Sensor is defective

ERROR CODE

Start

MAIN PCB Connector

No
CN30 is inserted
properly?
Yes Connector contact defect /
Reconnect

F-DEF Sensor is No
DATA1. Temp Table normal?

Yes
**Sensor Resistance Reading Location** Replace Temp Sensor
**F-DEF : Between CN30 #5 and #6
**Located in the PCB Box
**0Ω : Short / ∞Ω : Open Voltage between Main PBA Connector NO(Value < 0.6V or Value > 4.6V)
CN30-”5” and CN30-”6”
Refer to Circuit Diagram
Yes Check the wire connection
Sensor MICOM/Connector #
F Between Connector CN30- Input Voltage at IC10 MICOM No
DEF ”5” And CN30-”6” pin #51 is normal?
Voltage : Between 4.6V ~ 0.6V Yes Check Soldering Defect & Short

PCB and Temp Sensor are normal.

Voltage at IC10 MICOM Check the connector contact.
#51 is same as the value
between CN30-”5” and
CN30-”6”

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TROUBLESHOOTING

4-2-2. When the Freezer Fan does not operate (BLDC Motor)

-T his refrigerator uses the BLDC Fan Motor.

The BLDC Motor operates with DC 7~12V.
- The F-Fan motor generally runs together with the compressor.

☞ When checking with the Self Diagnosis

F FAN ERROR

Start

Yes
The Compressor is Off.

No Run Forced Operation

It reads DC7~12
Yes
between MAIN PCB
GND and CN30 #10
No
No FAN operates.
Upon the initial power on, the compressor
and the F-Fan operate. Apply power in 7 minutes after
turning the motor off. (To prevent the
And, when the Fridge temp is lower than compressor from being overloaded)
12℃, it will be regarded as an instant
power failure, starting in 7 minutes. Yes
Does it repeat DC 7~12V (between
Main PCB GND and CN30 #10) and No
lower than DC 2V (between Main PCB
GND and CN30 #9 ?
Yes Replace MAIN PCB

◆ Possible Causes
① Defective FAN-MOTOR
② Contact problem at the terminal (MAIN PCB CONNECTOR-
TERMINAL (CN 30 #9, #10, #11), Contact problem at Freezer
Fan Motor Connector, Defective Motor Wire)
③ Check the motor rotating pulse input upon Fan Motor
operation. (Refer to Fan-Motor Circuit in this manual)

60
TROUBLESHOOTING

4-2-3. When the Fridge Fan does not operate

- This refrigerator uses the BLDC Fan Motor.

The BLDC Motor operates with DC 7~12V.
- The F-Fan motor generally runs together with the compressor.

☞ When checking with the Self Diagnosis

F FAN ERROR

Start

Yes
The Compressor is Off.

No Run Forced Operation

It reads DC7~12
Yes
between MAIN PCB
GND and CN31 #9
No
No FAN operates.
Upon the initial power on, the compressor
and the R-Fan operate. Apply power in 7 minutes after
turning the motor off. (To prevent the
And, when the Fridge temp is lower than compressor from being overloaded)
12℃, it will be regarded as an instant
power failure, starting in 7 minutes. Yes
Does it repeat DC 7~12V (between
Main PCB GND and CN31 #9) and lower No
than DC 2V (between Main PCB GND
and CN31 #8 ?
Yes Replace MAIN PCB

◆ Possible Causes
① Defective FAN-MOTOR
② Contact problem at the terminal (MAIN PCB CONNECTOR-
TERMINAL (CN 31 #8, #9, #10), Contact problem at Freezer
Fan Motor Connector, Defective Motor Wire)
③ Check the motor rotating pulse input upon Fan Motor
operation. (Refer to Fan-Motor Circuit in this manual)

61
 TROUBLESHOOTING
4-2-4. When Defrost does not work (F DEF Heater)

-W
 hen there is a trouble in defrosting, select the Self-Diagnosis function before turning off the unit. And,
check if there is any defect in the Defrost Heater. If not, plug out the unit and do the Trouble-Shooting. (Refer
to the Self-Diagnosis function and check the details)
☞ When checking with the
F DEF. ERROR Self Diagnosis

Start
** Heater Resistance Reading Location **
F-DEF : Resistance between CN72 #5 ↔
CN73 #1 should be ohm ± 10%.
** 0Ω : Short / ∞Ω : Open
(Bimetal / Thermal Fuse / Heater Defect) All Defrost Heaters No
are normal?
** Sensor Resistance Reading Location **
F-DEF : Between CN30 #7 ↔ CN30#8
Yes
** 0Ω : Short / ∞Ω : Open
Check Bimetal, Heater
Temp vs. Resistance Table Continuity or Wire Connection
Defrost Sensor is No
30℃ 4.22㏀ normal? (Check it
20℃ 6.05㏀ For more with Self-Diagnosis)
10℃ 8.87㏀ detail data, Replace the Sensor
0℃ 13.29㏀ refer to Yes
-10℃ 20.42㏀ DATA1. Temp
-20℃ 32.23㏀ Table
-30℃ 52.41㏀ The Sensor No
Temperature Value
** Sensor Voltage Reading Location ** is lower than 12℃.
F-DEF : Between PCB COMMON Ground Forced Operation for a while
and CN30 #5 (or SEN_2) Yes
** 0V : Short / 5V : Open

After pressing the Power Cool and Do Forced Defrost

the Fridge buttons simultaneously for
6 seconds, push the Fridge button to
enter the Test Mode.
And then, when any one of the buttons
is pressed twice, the Forced Defrost will Power is applied to
start and "3℃, 5℃ and 7℃" LEDs will F-Defrost Heater. No
light up on the display panel.
Yes

Check the related sensors No After heating up for a while, it

if they are defective. goes back to Cooling Operation

Note When the temperature of the F DEF Sensor Yes

goes over 12℃ with the Defrost Heater heating up, it
stops heating and it goes back to Cooling Operation. Normal

SEG Voltage Watt OHM

RT29/ 230 130 406.9
RT32 120 130 110.8 MAIN PCB No
RT35/ 230 160 330.6 Connection is normal?
RT38 120 160 90.0
RT22/ 230 120 440.8 Yes Repair Connector
RT25 120 120 120.0
Check Bimetal, Heater Wire
Cut or Wire Contact

Repair Defective Relay or

replace PCB Assy

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TROUBLESHOOTING

4-2-5. When there is no Power in MAIN PCB

4-2-5-1. Area that is Rated input voltage 220~240V.

Caution
There is AC220~240V or - When checking the MAIN PCB, refer
DC310~340V at the MAIN PCB Start to the Operation descriptions and
Power Circuit. So, be cautious the "Reference" section.
when repairing the unit or
measuring values. No
The unit is plugged in? Plug in the unit

Yes
No
220~240V is applied
at MAIN PCB Check the wire connections
CN71 terminals?
Yes
Yes
1) Replace Fuse (AC 250V 2.0A)
MAIN PCB Fuse is blown?
2) Replace PCB ASS'Y

No
No
DC310~340V is applied Replace PCB ASS'Y
at BD101 terminals?

Yes
No
DC 6.2V is applied at Replace PCB ASS'Y
TOP S/W 3-12(BETTER)

Yes
No
12V is applied at
Replace PCB ASS'Y
CE101 terminals?

Yes
No
5V is applied at
Replace PCB ASS'Y
CE105 terminals?

Yes
No
Panel PCB operates 1) Check the wire connections
normally? 2) Replace Panel PCB

Yes
No
Loads such as Relay 1) Check Lead Wire connections
operate normally? 2) Replace Relay or PCB ASS'Y

Yes
Yes
Is there PCB Short 1) Do Re-soldering
or breakage? 2) Replace PCB MAIN
- Check the connection of Door Panel
PCB No
Normal (Check again)

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TROUBLESHOOTING

4-2-5-2. Area that is Rated input voltage 110~127V.

Caution
There is AC 110~127V or DC - When checking the MAIN PCB, refer
156~180V at the MAIN PCB Start to the Operation descriptions and
Power Circuit. So, be cautious the "Reference" section.
when repairing the unit or
measuring values. No
The unit is plugged in? Plug in the unit

Yes
No
110~127V is applied
at MAIN PCB Check the wire connections
CN71 terminals?
Yes
Yes
1) Replace Fuse (AC 250V 2.0A)
MAIN PCB Fuse is blown?
2) Replace PCB ASS'Y

No
No
DC 156~180V is applied Replace PCB ASS'Y
at BD101 terminals?

Yes
No
DC 6.2V is applied at
TOP S/W 3-12(BETTER) Replace PCB ASS'Y
2-8(GOOD)?
Yes
No
12V is applied at
Replace PCB ASS'Y
CE102 terminals?

Yes
No
5V is applied at
Replace PCB ASS'Y
CE105 terminals?

Yes
No
Panel PCB operates 1) Check the wire connections
normally? 2) Replace Panel PCB

Yes
No
Loads such as Relay 1) Check Lead Wire connections
operate normally? 2) Replace Relay or PCB ASS'Y

Yes
Yes
Is there PCB Short 1) Do Re-soldering
or breakage? 2) Replace PCB MAIN
- Check the connection of Door Panel
PCB No
Normal (Check again)

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4-2-6. When the Compressor is not working (INVERTER PBA)

When the inverter PBA LED

is ON, it indicates that the
compressor does operate
normally Start

10 minutes have No
passed since COMP
was off
Yes
Check in 10 minutes

No
Refer to Test Function in this When Forced Operation
manual mode is activated, COMP operates
No
Yes
Temperature Sensor is normal?
Forced Operation signal Yes
sound should be checked
Yes
0~800Hz 50% Duty Signal Replace the Sensor
Output
No
Temperature sensing
part of MAIN PBA is Good
No COMP operation
Signal(CN201 ①↔③) is
Repair the sensing
High(about DC 2-2.5V Yes
or AC 0~5.0V) part or Replace MAIN PBA

Check the wire harness Yes

Replace the MAIN PBA Replace MAIN PBA or
No Repair the connection
Is DC 16V applied to
ZD501?

Replace INVERTER PBA Yes

No
CN101/CN102 Connector is Good

Check the COMP wire

Yes Check the Compressor
Check AC Power wire
No
COMP ASS'Y is Good

☞ SMPS Primary Voltage checking(+16V) : REG1(+5V) Yes Replace COMP ASS'Y

Terminal(Input and GND) : DC16V±1.6V
Terminal(Output and GND) : DC5V±0.2V
NORMAL(Recheck)

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4-2-7. When the unit keeps alarming (Buzzer Sound)

[Note]
1. Fridge / Freezer Door Open Alarm : It sends out an alarm sound when it passes over 2 minutes after the door is open. And,
when the door remains open, it will keeps alarming every minute.
2. When the door is not closed properly, MICOM recognizes it as Door Open and sends out an alarm sound. When it passes
over 10 minutes after it recognizes the Door Open, the room lamps will be off. At this time, when the Door is completely
open, the Lamp will not be on right away, but after a while.

① When there is "Ding Dong" sound not stopping

Start

Gap exists
Door stays open?

Closed Check if there is any obstacle

pushing the Door open.

Water penetrates into Yes

Door S/W?
No Replace Door S/W
Door & MICOM State
Door MICOM #8 MICOM #8 Voltage
No
changes when the Door
Close 0V is open/close?
Open 5V Yes Repair Wire Cut / Door S/W

Connector (CN31) is No
inserted properly?
Yes Insert the Connector
Remove and measure the continuity of
Door S/W by pressing it (On/Off). Door S/W is in good No
Check if the value changes between condition?
0Ω and ∞Ω.
Yes Replace Door S/W
Check MAIN PCB and
Door S/W

② When it keeps 'Beeping'

Start

The unit is not in Forced

Yes
Operation or Forced
Defrost mode.
No Cancel Forced Operation/Defrost
When the unit is
No
plugged out and in
again, it keeps beeping?
Yes MAIN PCB is normal
Check if there is any foreign
substance at Test Jumper of MAIN
PCB or any part shorted out
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TROUBLESHOOTING

③ No Buzzer Sound

This model has a buzzer affixed on the MAIN PCB.

If there is no buzzer sound upon button press, Forced Operation or Door Open, disconnect MAIN PCB and
check if the buzzer is damaged or there is any defective soldering.
(If it is not a soldering problem, it is recommended replacing MAIN PCB due to difficulties in repairing)
※ It may not be able to check when it is a closed built-in environment and there is lots of noise around.

Start

"DingDong" sound goes No

off when a button on
the display panel is pressed.
Check & Replace MAIN PCB
Yes BUZZER

Door Alarm goes

off when any one of Fridge & Freezer Yes
doors remains being open over 2
minutes.
Normal
No

Any breakage or kink Yes

in MAIN PCB BUZZER

BUZZER Breakage ---- Replacement

No

Solder lead comes off the Yes

BUZZER vibration plate.

No Replace MAIN PCB

Check the button pressing force and

structural design (Door Sensing)

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4-2-8. When PANEL PCB operates abnormally

① When PANEL PCB does not light up or partially does

Start
Refer to Wiring Diagram
attached in this manual The connector on the No
and check the Electrical Fridge Top Table is
Diagrams attached on the inserted properly.
back of the unit. Re-insert Connector,
Yes Correct the defective contact

MAIN PCB Connector No

CN51 & CN52 is inserted
properly
Yes Re-insert MAIN PCB Connector

DOOR PANEL PCB No

Connector is inserted
properly
Re-insert Connector,
Yes Correct the defective contact
Room Lamp lights up No
when you open a door
When PANEL KEY is
Press the Power Cool Key for 3 seconds.
not selected Yes And then, check display.

It lights up when
Yes
PANEL-PCB is being
replaced
No
Defective PANEL PCB
① Check Fridge Door Wiring - Short or Open Wire
② Check CABI Upper Wiring - Short or Open Wire
③ Check Short/Open at MAIN PCB Panel Lamp Circuit

② When Panel PCB buttons are not working

※ When the trouble is being remained after the above,

There are no buttons

Being Pressed
being pressed
continuously.
Yes Re-assemble PCB ASS'Y, Correct
any restrictions on the buttons
The trouble continues When being separated, it works
with PCB being
removed
Yes Re-assemble PCB ASS'Y, Correct
any restrictions on the buttons
When PANEL-PCB is Yes
being replaced, it
works normal.
No Defective PANEL PCB

① Check Fridge Door Wire - Short or Open Wire

② Check CABI Upper Wiring - Short or Open Wire
③ Check Short/Open at MAIN PCB Panel Communication/Power-Supply Circuit
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TROUBLESHOOTING

4-2-9. When the Room Lamp (LED) does not light up

Door & MICOM State

Start
MICOM #8
DOOR S/W
Fridge
Close 0V DOOR S/W works No
normal (Open/Close)
Open 5V
Yes Check & Replace DOOR S/W
MICOM State
R IC10 MICOM #43 Output No
Door (Fridge) Voltage is normal
#8
Close 0V Yes Replace / Repair PCB
Open 5V
Voltage Output at Pin
No
Q711(R), Q713(F) CN75 #1,#3 is
normal
Micom CN75 #1,#3
Yes Replace PCB
0V(Low) 0V(Low)
5V(High) 10~12V(High) Voltage Output at the
No
MAIN PCB Connector
(CN75) is normal (10~12V)
Yes Check Connector Terminal /
Replace PCB
The LED Lamp is No
connected properly
Yes Check Connector Terminal

No
The LED Lamp is ok

Yes Replace LED LAMP

Normal

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 TROUBLESHOOTING

4-2-10. When Ice Maker does not operate (Model with Ice Maker)

1. Water supplies to the Ice Maker automatically and ice is to be twisted out depending on its temperature and
the timing.
2. Power is always applied to the Ice Maker. So, refer to the disassembly section to remove it.
3. To check the operation of the Ice Maker, press the Ice Maker Test Switch before disassembling it.
It is not possible to check its operation after disconnecting its power.

ERROR CODE

Start

Upon the initial power on, No

does it check its position?

Yes 1) Check the Wire Connection

2) Check and Replace ICE MAKER KIT
When pressing the Ice
No
Maker Test Switch does it
rotate?
Yes Check and Replace ICE MAKER KIT
MICOM(IC10) Operation Status

#20 Standby On Voltage at IC10 MICOM No

(Test Switch) #20 is normal?
5V 0V
Yes 1) Check after connecting the Wire Harness
Micom(IC10) Operation Status
2) Check and Replace ICE MAKER KIT
Standby Rotating
Full Rotating
Standby 3) Replace MAIN PCB
Rotated Back
#16 5V 0V 5V 0V 5V Water supplies after a No
while?

Yes 1) Check and replace Water pump

* Refer to Water pump operating conditions

ICE Maker Sensor itself is in No

good condition?

Yes 1) Check and replace Ice Maker

* Refer when Ice Maker Sensor is defective
PCB and other parts are normal
Check again the Connector contact

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LED blinking frequency depending on protecting functions(Inverter PBA)

* Self-Diagnosis Error Description

- When the Failure Condition occurs, the Compressor will immediately stop if the Compressor is running
and there will be a 5 minute standby. During the 5 minute standby, RPM signals will be ignored. That is,
even though the Inverter PBA receives the RPM signals, the Compressor does not work. It blinks every
second and there is 2 second off at the end of each cycle.

Protecting
LED Blinking Frequency Remark
Functions

Normal
N/A
Operation

Starting
Failure 1. Short between COMP U,V, and W phase (CN102)
2. Short among IC3 Pins (No. #1~24)
3. Drop the IPM operating Voltage under DC 13.5V
4. Other cases, check the COMP, cycle, etc.
IPM Fault

1. Open the COMP wire (CN102)

Motor Position 2. Bad condition of resistor R1(ex. Bad soldering)
Error 3. Other cases, check the COMP, cycle, etc.
4. Short or Open resistor R515, R516, R517
1. Operating the locked rotor COMP within 5 second.
2. O
 perating the COMP under 1000 RPM more than
Motor Position 5 seconds.
Error 3. O
 ccur the huge change of input voltage in a
moment.
4. Other cases, check the COMP, cycle, etc.

1. D
 rop the input voltage under AC106V. Short
Low Voltage
resistor R514 (DC link resistor)

1. Increase the input voltage over AC 310V

Over Voltage 2. S
 hort resistor among R511, R512 and R513 (DC
Link resistor)

LED blinking frequency depending on protecting functions If the same blinking, After 5 minutes, Follow the
Remarks

71