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The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on
the corresponding function indication LED. The drive type is the scan type.

- 24 -

- 25 -

• The resistance of SENSOR has ±5% common difference.
• Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature.

This postponing is necessary because of perceiving speed.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

TEMPERATURE SENSOR

RESISTANCE OF REFRIGERATOR

(DEFROST) SENSOR

- 20 ˚C

77 K

Ω

- 15 ˚C

60 K

Ω

- 10 ˚C

47.3 K

Ω

- 5 ˚C

38.4 K

Ω

0 ˚C

30 K

Ω

+ 5 ˚C

24.1 K

Ω

+ 10 ˚C

19.5 K

Ω

+ 15 ˚C

15.9 K

Ω

+ 20 ˚C

13 K

Ω

+ 25 ˚C

11 K

Ω

+ 30 ˚C

8.9 K

Ω

+ 40 ˚C

6.2 K

Ω

+ 50 ˚C

4.3 K

Ω

- 26 -

• Replace PCB when no trouble after checking the contents of trouble.

POWER SOURCE

1. All the DISPLAY

1. FREEZER/

FREEZER/REFRIGERATOR

POWER SOURCE is poor

Certify Fuse.

is poor

LED

OFF

REFRIGERATOR

DOOR OPEN

Certify outlet Voltage.

2. DISPLAY LED 

2. LAMP is dim.

CHECK with the naked.

Applied voltage mistake

Use boosting TRANS.

represents abnormal

3. The connection of 

Certify connection of

CONNECTOR connection 

Reconnect CONNECTOR.

operation.

CONNECTOR of MAIN PWB.

CONNECTOR.

is poor.

TRANS FUSE open.

Replace TRANS.

COOLING is poor

NO COOLING

1. COMPRESSOR operates?

Check the MAIN PCB.

COMPRESSOR lock or

Replace COMPRESSOR.

blocked.

OLP, PTC is poor.

Replace OLP, PTC.

COMPRESSOR RELAY is 

Replace MAIN PWB RY1

poor

THE CONNECTING WIRE

Certify the black wire of MAIN 

is poor.

PWB CONNECTOR (CON1)

2. Whether refrigerant leaks or

Measure the amount of frost

Refrigerant leakage.

Remedy the leaking part

leaks or not.

sticking on EVA and the 

and reaching Refrigerant.

surface temperature of

condenser pipe.

FREEZER

1. Whether FAN

MOTOR

Check the MAIN PCB.

FAN MOTOR is poor

Replace FAN MOTOR.

TEMPERATURE is poor

operates or not.

DOOR LINE contact.

Replace DOOR LINER.

CONETTING WIRE is poor.

Certify MOTOR and the 

connection of the black wire 

of MAIN PWB CONNECTOR.

(CON1)

2. DEFROSTING normal?

Certify the amount of frost

DEFROSTING is poor.

See the DEFROSTING 

sticking on EVA.

trouble.

3. SENSOR normal?

Check resistance the 

SENSOR RESISTANCE is

Replace SENSOR

SENSOR in the 

poor.

Refrigerator

- 27 -

COOLING is poor.

REFRIGERATOR

1. FREEZER TEMPERATURE

See "FREEZER

Certify the attaching state

TEMPERATURE is 

is normal?

TEMPERATURE is poor".

of DOOR.

poor.

2. Cool air of FAN MOTOR is

Certify the amount of cool air

FAN MOTOR is poor.

Replace FAN MOTOR.

is sufficient?

and its speed touching check

Passage of cool air blocking.

Remove impurities.

supplied into 

REFRIGERATOR  

EVA frozen.

See "DEFROSTING is poor".

DEFROSTING is

NO DEFROSTING.

1. HEATER emit heat?

Check the MAIN PCB.

HEATER disconnection.

Replace HEATER.

poor.

TEMPERATURE FUSE

Replace TEMPERATURE

disconnection.

FUSE.

Connection is poor.

Certify EVA connection and 

wire of MAIN PWB 

CONNECTOR (CON1)

DEF-SENSOR is poor.

Replace DEF-SENSOR.

HEATER RELAY is poor.

Replace RY4 of MAIN PWB.

2. DRAIN PIPE blocking?

Certify DRAIN PIPE.

DRAIN PIPE blocking.

Remove ice and impurities.

Certify HEATER PLATE

resistance.

3. Remain ice at 

Certify the attaching 

Attaching is poor.

Reassemble DEF-SENSOR.

DEFROSTING?

of DEF-SENSOR.

Certify the attaching

DOOR sticking is poor.

Reassemble DOOR.

state(gap) of FREEZER/

Replace GASKET.

REFRIGERATOR DOOR.