Daewoo Frs 20 Service Manual

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1. How to start
1) Press “FRZ.TEMP” button 5 times while pressing 
“REF.TEMP” button at the same time.
2. How to stop
1) Push “FRZ.TEMP” button 1 time.
2) It stops automatically in 4 minutes from the start.
3. All the error codes are reset  if they turn to be normal.
4. Error display
INPUTCONTROL OBJECT
CONTENTS REMARKS  Temperature Control ButtonsLamp LED of Inner control
(Full down mode and forced defrost mode are displayed while pressing
“REF.TEMP” button at the error display mode)
REF. LED “1” is on and off (twice) Forced defrost mode for A/SREF. LED “1” is on Full Down modeREF. LED “1” is on and off EEPROM : defectiveREF. LED “2” is on and off Return after defrosting : defectiveREF. LED “3” is on and off Cycle : defectiveREF. LED “5” is on and off F-Door Switch : defectiveFRZ. LED “1” is on and off R-Door Switch : defectiveFRZ. LED “2” is on and off D-sensor : open (“Lo”), short (“Hi”)FRZ. LED “3” is on and off RT-sensor : open (“Lo”), short (“Hi”)FRZ. LED “4” is on and off R-sensor : open (“Lo”), short (“Hi”)FRZ. LED “5” is on and off  F-sensor : open (“Lo”), short (“Hi”)Display CONTENTS
4-10. Error Display 
4-10-1. Basic Model (LED Display of Inner Control)
 
						

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5. Control way of Errors (if any)
1) “F-sensor” error
Cause : F-sensor open or short
Control : Condition of ambient temperature
How to reset : If F-sensor is normal, the error is terminal temperature.
CONTENTS REMARKS 
2) “R-sensor” error
Cause : R-sensor open or short
Control : Condition of ambient temperature
How to reset : If R-sensor is normal, the error is terminal temperature.
3) “RT-sensor” error
Cause : RT-sensor open or short (full down)
Control : Normal operation, deletion of control by RT-sensor 
If RT-sensor is normal, the error is terminated automatically.
4) “D-sensor” error
Cause : D-sensor open or short (full down)
Control : Time limit (30 min) of defrosting return
If D-sensor is normal, the error is terminated automatically.
5) “Door” error 
Cause : in case it senses that door is open for more than 1 hour.
Control : Deletion of function related door switch sensing
If door switch (open & close) is sensed, the error is terminated automatically.
6) “Cycle” error
Cause : in case comp. works for over 3 hours when D-sensor temp. is over -5℃
Control : normal operation
When D-sensor temp. is below -5℃in comp. off it is terminated.
7) “Return after defrosting” error
Cause : in case defrosting return is done by time limit of 80 min
Control : Deletion of Pre-cool mode in defrosting mode
If defrosting return is done by D-sensor, it is terminated.
8) A/S forced defrosting mode
Push “REFRIGERATOR SET” button 5 times while pushing “FREEZER SET” button
Simultaneously.
Control : A/S forced defrosting control (Pre-cool is deleted)
If D-sensor temp. is over 10℃, the mode is terminated automatically.
When all error code is normal, the Refrigerator reset35 / 20 35 / 20 26 / 22 27 / 45 16 / 41 14 / 50 ON/OFF (min)Over 41℃ ~ 41℃ ~ 31℃ ~ 21℃ ~ 15℃ ~ 9℃ RT-S
6 / 4 4 / 6 3 / 7 2 / 10 3 / 50 OFF ON/OFF (min)Over 41℃ ~ 41℃ ~ 31℃ ~ 21℃ ~ 15℃ ~ 9℃ RT-S
 
						

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1. How to start
1) Under “LOCK” mode, press “SUPER FREEZER” button 5 times while pressing 
“FREEZER SET” button at the same time.
2) The front CLED displays as the right diagram shows 
( [Ex.] Time Display of 0003 signifies 3 minutes of power on time.)
3) Press “FREEZER SET” button and the following value is displayed successively.
①Time
②F-Sensor temperature
③D-Sensor temperature
④R-Sensor temperature
⑤RT-Sensor temperature
⑥P Factor display (Refer to water supply mode of automatic icemaker)
⑦Filter remaining time until change (First check ; 4,320Hr)
Refer to Filter Information Reset of CLED of front control panel.
4) Error is displayed only if there is any ; it is skipped if no error.
2. How to stop
1) Push “LOCK” button 1 time.
2) It stops automatically in 4 minutes from the start.
3. All the error Codes are reset if they turn to be normal.
4. Error code
INPUTCONTROL OBJECT
CONTENTS REMARKS  Temperature Control Buttons 88 Display CLED
Display forced defrost mode for A/S D2Display Full Down mode CoReturn after defrosting : abnormal or defective F3Cycle : abnormal or defective C1Full ice switch : error EuDrop the ice while Et EAMicro switch : error ESWater supply : error EgHorizontal switch : error EtFlow sensor : defective EFI-sensor : disconnection (“Lo”), short (“Hi”) EIHome bar Door Switch : defective dHF-Door Switch : defective dFR-Door Switch : defective drD-sensor : disconnection (“Lo”), short (“Hi”) d1RT-sensor : disconnection (“Lo”), short (“Hi”) rtR-sensor : disconnection (“Lo”), short (“Hi”) r1F-sensor : disconnection (“Lo”), short (“Hi”) F1CONTENTS ERROR CODE
4-10-2. Dispenser Model (CLED Display of Front PCB)
 
						

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1) “F1” error
Cause : F-sensor disconnection or short
Check point : Measure the resistance between both terminals after separating CN8 (or CN15)
of the Main PCB. (Refer to the 5-2.)
If F-sensor is disconnected or shorted , change the F-sensor in the freezer compartment.
How to reset : If F-sensor is normal, the error is terminal temperature.
CONTENTS REMARKS 
2) “R1” error
Cause : R-sensor disconnection or short
Check point : Measure the resistance between both terminals after separating CN7 (or CN14)
of the Main PCB. (Refer to the 5-2.)
If R-sensor is disconnected or shorted , change the F-sensor in the refrigerator compartment.  
How to reset : If R-sensor is normal, the error is terminal temperature.
7) “F3” error
Cause : in case defrosting return is done by time limit of 80 min
Check point :  Measure the resistance between both terminals of the defrost heater.
(Assembled with evaporator)
If the resistance is ∞Ω(disconnected) or 0Ω(short) change the  3) “rt” error
Cause : RT-sensor disconnection or short (full down)
Check point : Measure the voltage of “A” part on the Main PCB.
If the voltage is 0.5V~4.5V, it is normal.
If the voltage is 0V (short) or 5V (disconnected), change the RT-sensor on the Main PCB
How to reset : If RT-sensor is normal, the error is terminated automatically.
< Basic Model >
A
< Dispenser Model >
A
4) “d1” error
Cause : D-sensor disconnection or short (full down)
Check point : Measure the resistance between both terminals after separating CN8 (or CN15)
of the Main PCB. (Refer to the 5-2.)
If D-sensor is disconnected or shorted , change the D-sensor on the evaporator.
How to reset : If D-sensor is normal, the error is terminated automatically.
5) Door error (“dF” “dR” “dH” on display)
Cause : in case it senses that door is open for more than 1 hour.
Check point : F/R door is opened or not.
6) “C1” error
Cause : in case comp. works for over 3 hours when D-sensor temp. is over -5℃
Check point : Refrigerant leakage.
8) “d2” mode (A/S forced defrosting mode)
Push “REFRIGERATOR SET” button 5 times while pushing “FREEZER SET” button
simultaneously.
Control : A/S forced defrosting control (Pre-cool is deleted)
If D-sensor temp. is over 10℃, the mode is terminated automatically.
Refer to the 4-3. . 5. Control way of Error (if any)
 
						

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9) “EI”ERROR
Cause : I-SENSOR disconnection / short
Check point : Measure the resistance between both terminals after separating CN11
of the Main PCB. (Refer to the 5-2.)
If F-sensor is disconnected or shorted , change the I-sensor in the automatic ice maker.
CONTENTS REMARKS 
10) “EF” ERROR
Cause : When Flow-sensor ERROR (There is no Pulse during some time)
The number of pulse signal is below 10 by 1 sec during water supply.
Check point : Water supply line
13) “Ea” error
Cause : Malfunction of ice drop motor.
Check the motor by pushing test switch. 11) “Eg” ERROR
Cause : I-sensor temp (5min after water supply) doesn’t go up.
Check the I-sensor or water supply line.
12) “ES” error (MICRO switch error)
Cause : When it senses 1min continuously
Check the MICRO switch of the dispenser.
14) “Eu” error
Cause : Switch (which senses if the ice is full or not) is in error.
Control : When dropping the ice, the motor just rotates 90 degree.
Termination : When the switch is in normal.
15)“EA“ ERROR
Cause : When sensing Ice dropping by time 3 times in level sensor SW Error.
Control : Stop of Ice Maker
Termination : With normal level switch.
Re-input of power or push if icemaker test switch.
16)“Et” ERROR
Cause : Level switch error (No pulse is sensed for some time)
Control : By time (Supply mode is skipped)
Termination : Normal condition.
* When all ERROR CODE is normal, the Refrigerator reset
 
						

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Element A/S Function
INPUTCONTROL OBJECT
CONTENTS REMARKS  Each buttonResistance of R-sensor Mid ON/OFF Point
“REF.TEMP”+ “FRZ.TEMP” 5 times Error display“FRZ.TEMP”+ “FRZ.DOOR” OPEN/CLOSE 5 times Demo function“REF.TEMP”+ “FRZ.DOOR” OPEN/CLOSE 5 times Pull Down“FRZ.TEMP” + “REF.TEMP” 5 times Forced Defrosting
1. All the modes are started “LOCK” mode (except “FILTER RESET” mode)
2. Element A/S Function
INPUTCONTROL OBJECT
CONTENTS REMARKS  Each buttonResistance of R-sensor Mid ON/OFF Point
“WATER/ICE” + “ICE MAKER LOCK” 5 times Ice maker test“WATER/ICE”+ “RESET WATER FILTER” 5times EEPROM clear“FREEZER SET”+ “SUPER FREEZER” 5 times Error display“REFRIGERATOR SET”+ “FREEZER SET”+ “WATER/ICE”5 times Pull Down“REFRIGERATOR SET” + “WATER/ICE” 5 times Demo functionPush “RESET WATER FILTER” for 3 seconds Reset water filter“FREEZER SET” + “REFRIGERATOR SET” 5 times Forced Defrosting
4-11. Summary of Function
4-11-1. Basic Model (Inner Control)
4-11-2. Dispenser Model (Front PCB)
 
						

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1. Filter Exchange Information : Record as a real-time from the point of 
power input
2. P Factor (Information about Ice Maker)
INPUTCONTROL OBJECT
CONTENTS REMARKS  None
1. F-FAN, R-FAN, C-FAN 
INPUTCONTROL OBJECT
CONTENTS REMARKS  Full ice sensing switch
Ice Maker Lock
Sensors Ice separating motor
1. Flow of ice making
1) Press TEST switch under the Icemaker for more than 1 second and test starts.
* Test mode starts from ice separating mode.
* In case test switch has an error of short, test is done only once.
START
Ice making mode
Ice separating mode
Water supply mode
Water supply 
check mode
RETURN
Ice is being made▶
▶
Ice tray is twisted to separate
ice cubes
▶Water is supplied to ice tray
▶Check is water is supplied OK.
(water supply stand by)
4-12. Back up Function (Basic Model)
4-13. Automatic Icemaker ( Dispenser Model)
 
						

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CONTENTS REMARKS 
2) With the initial power input, Ice tray turns to be horizontal and ice making
mode starts.
3) Control of water hose heater
* Heater is always ON if RT-sensor has an error or RT is below 15 degree.
* Heater is always ON for 60 minutes (max. Limit time) if Flow-sensor has
an error
4) Water supply stand-by
Condition : if ice is sensed full
Operation : proceeds to Ice making mode (Ice separating and water supply Modes stop)
5) Crusher Function
It stops operation when freezer door is open
It operates if freezer door is closed.
2 Ice making mode
START
130 min passed?
I-S＜－12.5℃
Ice saparating mode
I-S＜-9.5℃
15 min  passed?
NO
NO
YESYES
YESNONO
YES
1) Ice making stops if ice-sensor is below -12.5℃after 130 minutes.
2) Ice making also stops if ice-sensor is below -9.5℃for 15 minutes, though
ice-sensor is not below -12.5℃after 130 minutes.
3) In case of ice sensor, ice making stops after 4.8 hours.
 
						

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CONTENTS REMARKS 
3. Ice separating (drop) mode
CCWCWSTOPCWmotor
revolutionlevel SW status of
ice tray
Horizontal position Ice separation start
8~11secMAX1.1sec 8.5~12.2sec 0.2sec
normal 
level SW
level SW
error1.1 sec 11 sec 10 sec
1) Time of each zone used to verify level switch error
2) The rotation of motor is sensed at each zone
3) In case of level switch error, ice separation is done by time.
4) If ice separating motor has error, the mode stop.
4. Water supply mode
START
Water supply valve ON
Water flow Pulse Count = 0
N
Water flow Pulse spec
 〉Pulse spec
END
water supply time 〉time spec
water supply valve OFF
Y
1sec passed after 
water valve ON ?
Water flow Pulse  > 10
Flow-Sensor Error mode operation
Y
N
Y
Y
N
N
 from  ManualL 
						

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CONTENTS REMARKS 
1) Water supply valve is open when water supply mode starts after separation of ices.
2) Water is supplied by time in case sensor has error.
3) Factor valve is variable which can be useful in AS action
①Water flow pulse is set to 238 if flow sensor is in normal condition.
(If water is supplied by time, maximum water supply time 165 seconds)
②In case water flow sensor has error, water time is 5.5 seconds.
5. Water supply check mode
5 minutes after water supply the status can be checked by RT-sensor and increase
of temp. Ice sensor.
-5℃ -6℃ -7℃ -8℃ -9℃ -10℃ I-S41℃↑ ~41℃ ~31℃ ~21℃ ~15℃ 9℃↓ RT-S
4-14. Dispenser Control Function
INPUTCONTROL OBJECT
CONTENTS REMARKS  Dispenser switch
WATER/ICE Button
ICE MAKER LOCK Button
Freezer Door SwitchDispenser Lamp
Crusher Motor
Flap Solenoid
Crusher Solenoid
Dispenser Water Valve 
1) Initial mode : water
(Mode change : Water →Cubed ice →Crushed ice)
- Selected icon LED turns ON and others are OFF.
2) ICE MAKER LOCK Button
Icemaker Lock function and its ICON Turn ON/OFF by pressing the button.
3) Display
①Water ICON turns ON as default mode
②The ICON of each mode turns ON by pressing its button.
(If display switch makes error during operation of a mode, its ICON  turns OFF)
③When Icemaker Lock ICON turns ON.
- ICE MAKER LOCK ICON turns ON
- If it is in the mode of Cubed Ice or Crushed Ice, the mode is changed to
Water and Water ICON turns ON
- If there is no button input for 1 hour after selecting Cubed Ice or Crushed
Ice the mode turns to Water (default)