DOWNLOAD LG GR-B-L207EC-ER Service Manual ↓ Size: 5.21 MB | Pages: 127 in PDF or view online for FREE

1. Function of trouble diagnosis is to make the repair  service easy when the refrigerator is out of order during service.

2. The function control button does not work but the recognition sound is heard when the refrigerator is out of order.

3. It returns to normal conditions when trouble code led is off. (reset)

4. Trouble code is indicated by the freezing temperature indicator led in the refrigerator display. All leds except trouble code

are off.

- 28 -

Max

Min

1

3

5

TROUBLE

CODE INDEX

A

B

C

D

Trouble Code Indicator

Operation conditions during Trouble

No.

Trouble

Troubles

Freezer

Defrost

Step motor

F4      F3     F2     F1

Compressor

Fan

Heater

Damper

1

Abnormal Freezer 

l

l l 

Freezer sensor short 

15 min. on/ Standard

ˇ 

ˇ 

sensor. 

15 min. off

RPM

Abnormal Refrigerator 

2

sensor 1 (R1)

l l  l

Refrigerator sensor 1 short circuit

ˇ 

Standard

ˇ 

Note 2)

(Upper part in the

RPM

refrigerator compartment)

Abnormal Refrigerator

3

sensor 2 (lower part 

Note 1)

Refrigerator sensor 2  short circuit

ˇ 

Standard

ˇ 

ˇ 

in the refrigerator 

RPM

compartment)

4

Abnormal Defrost 

l  l l

Defrost sensor short circuit

ˇ 

Standard

No 

ˇ 

sensor 

RPM

defrosting

Failed defrosting

Defrost Heater, Temperature Fuse 

5

   

short circuit. 

ˇ 

Standard

ˇ 

ˇ 

Unplugged Connector

RPM

(Indicated 4 hour later after trouble)

Abnormal Open Air 

Open air temperature detecting sensor 

6

Temperature 

Note 1)

short circuit

ˇ 

ˇ 

ˇ 

Detecting sensor

7

Abnormal

Note 1)

Defrost sensor short circuit.

ˇ 

ˇ 

ˇ 

ˇ 

ice making sensor

Abnormal

Faulty Ice Maker Unit Motor or

8

ice maker unit

Note 1)

Hall IC, L/Wire short circuit.

ˇ 

Standard

ˇ 

ˇ 

Faulty motor driving circuit.

RPM

   

: On

l 

: Off

ˇ  

: Normal

Note 1) When open  air temperature detecting  sensor, refrigerator sensor 2, ice maker unit, ice  making sensor are

abnormal, it is not indicated in the trouble code. But it  is   indicated while checking LED (press freezer and
refrigerator temperature control buttons  for more than 1 second  at the same time).

Room Temperature 

Normal :

LED On.

Detection Sensor

Abnormal : 

LED Off.

Refrigerator Sensor 2 

Normal :

LED On.

(lower shelf)

Abnormal : 

LED Off.

Home Bar Sensor

Normal :

LED On.

Abnormal : 

LED Off.

Ice Maker Unit

Normal :

LED On.

Abnormal : 

LED Off.

Note 2) When refrigerator sensor is abnormal, it opens for 10 minutes and closes for 15 minutes.

1. Test function is to check the function of PWB and products and to find defective parts when the refrigerator is out of order.
2. Test button is on the main PWB of the refrigerator. Test mode completes after 2 hours in maximum and returns to normal

conditions.

3. Function control button does not work but button recognition sound is heard during the test mode.
4. When test mode is completed, unplug and replug the power cord to return to the normal conditions.
5. When sensor is abnormal in the test mode, test mode is released and trouble code is indicated.
6. Test mode does  not work even test button is pressed when trouble code indicator is on.

- 29 -

Test 1

Test 2

Test 3

Normal

Press test button once

Press test button once in
Test Mode 1

Press test button once in
Test Mode 2

Press test button onec in
test mode 3

1. Continuous compressor operation
2. Continuous freezer fan (high rpm) operation
3. Defrost heater off.
4. All display LEDs are on.
5. Electronic stepping motor damper open

(baffle is open).

1. Compressor off.
2. Freezer fan (high rpm) off.
3. Freezer fan (standard rpm) on.
4. Defrost heater off.
5. “Medium Weak” led in freezer and

refrigerator temperature indicators are on.

6. Step motor damper open condition 

(baffle is open)

1. Compressor is off.
2. Freezer fan off.
3. Defrost heater on.
4. “Medium” leds in freezer and refrigerator

temperature indicators are on.

5. Step motor damper closed condition 

(baffle is open)

Return to initial conditions

Forced start

Check fan in the freezer 
compartment 

• Return to normal

conditions when defrost
sensor is above 5 

°

C.

• Forced defrost.

Compressor starts after
seven minutes.

A

A

B

B

C

C

D

D

The rest of 
LEDs are all on

* LED check function- When freezer and refrigerator temperature control buttons are pressed for more than 1 second at the

same time, all LEDS on the display are on. And it returns to the normal conditions when the buttons are released. 

* Check of freezer fan rpm variation- Freezer fan speed changes from high speed to standard speed and vice versa for 30

seconds whenever freezer and refrigerator temperature control buttons are pressed at the same time for more than 1
second when freezer fan is in operation and returns to the previous rpm.

1. Ice and cold water are available without opening refrigerator door. 

2. The desired ice (crushed or cube) or cold water are dispensed when dispenser press button (rubber button) is pressed

after selection of ice or cold water. When ice is selected, duct door opens by electric solenoid when dispenser press
switch is pressed. When dispenser press switch is released, duct door closes after it opens for 5 seconds.

3. Ice and water dispensing function stops when freezer door is open.

4. Geared motor and solenoid are automatically off if there is no signal after 3 minutes when ice (crushed and cube) or

water is selected and dispenser switch is pressed down. Solenoid (duct door) stops after 5 seconds when solenoid is off.
(in order to protect short circuit from solenoid heat generation)

5. Dispenser Lamp On/Off Function. The dispenser lamp shall be on or off whenever dispenser button is pressed or

released, respectively after selection of ice (crushed or cube) or water.

6. Water/Crushed Ice/Cube Ice Selection function

1) It is to select water/crushed ice/cube ice by user from the function control part and it will be indicated and selected by

pressing button.

2) Crushed ice is automatically selected when power is initially on.
3) When crushed ice is selected and its button is pressed, geared motor operates and crushed ice is dispensed.
4) When cube ice is selected and its button is pressed, geared motor and ice solenoid operate and cube ice is dispensed.

7. Function of Water Dispenser

1) When user selects water in the function control parts, it is indicated in the LED and water is selected.
2) Water dispenser is a direct tap water connection type. The water solenoid valve on the right of machine room opens

and water dispenses when user selects water and presses button.

- 30 -

- 60 -

1. Faulty start

1) No power on outlet.
2) No power on cord.

3) Shorted  start circuit.

4) During defrost.

* Measuring instrument :

Multi tester

■

Check the  voltage.
If the voltage is within 

±

85%

of the rated voltage, it  is OK.

■ 

Check the terminal
movement.

■ 

Check both terminals of
power cord.
Power conducts : OK.
No power conducts : NG

■ 

Check both terminals of
O.L.P.
If power conducts : OK.
If not : NG.

■ 

Check the resistance of both
terminals.
At normal temperature 6 :
OK.
If disconnected : 

∞

.

Bad connection between adapter and outlet. (faulty adapter)

The  Inner diameter of adapter.
The distance between holes.
The distance between terminals.
The thickness of terminal.

Bad connection between plug  and adapter (faulty plug).

The distance between pins.
Pin outer diameter.

No power on
power cord.

O.L.P is off.

No electric power on compressor. - Faulty compressor.

Faulty PTC.

Disconnected copper wire.

Faulty terminal contact.

Disconnected. 

Capacity of O.L.P is small.

Characteristics of O.L.P is bad.

Bad connection.

Power is 
disconnected.

Inner Ni-Cr wire blows out.
Bad internal connection.
Faulty terminal caulking (Cu wire is cut).
Bad soldering.

Weak connection.
Short inserted cord length.
Worn out tool blade.

Loose contact.
- Large distance between

male terminal.

- Thin female terminal.

Terminal disconnected.

Bad sleeve assembly.

Power cord is disconnected.

Faulty soldering.

Start automatic defrost.
Cycle was set at defrost when the refrigerator
was produced.

Power does not conduct. - Damage.

Bad characteristics. - Initial resistance is big.

Bad connection with
compressor.

Bad terminal connection.

Too loose.
Assembly is not possible.