Error code reference
LG Washer Error Code SF1
System error due to micro controller operation failure.
System error due to micro controller operation failure.
First step from the service manual
1
Replace Assy PCB.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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SF1 on my LG WM3900HWA
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System error due to micro controller operation
From Service Manual 587473, p.45:
1.Replace Assy PCB.
2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.
3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.
Part EBR73304205
Main control board
Related LG washer codes
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- 1Water inlet error
- 10Ball sensor error
- 11Suds Error
- 11CWater level sensor error (Upper washer)
- 11EWater leakage error (E9)
- 12Power failure
- 12ESwitch error (USA designation) equivalent to bE1; Power…
View all 349 LG washer codes
- 13CWashing motor error and hall sensor error (Upper washer)
- 13ESwitch error (USA designation) equivalent to bE2; a button…
- 14CWater supply error (Upper washer)
- 14C2Water supply error (Upper washer)
- 14ESwitch error (USA designation) equivalent to bE3; main…
- 15CDrain error (Upper washer)
- 18C1MEMS PB error (Upper washer)
- 18C2MEMS PB error (Upper washer).
- 19C1Power error (Upper washer)
- 19C2Power error (Upper washer)
- 1ACCommunication error (Upper washer)
- 1AC4Communication error (Upper washer)
- 1AC6Communication error (Upper washer)
- 1AC7Communication error (Upper washer)
- 1bC2Switch error (Upper washer)
- 1CWater level sensor error caused by damaged/clogged/folded…
- 1dCDoor error (Upper washer)
- 1dC1Door error (Upper washer)
- 1dC4Door error (Upper washer)
- 1EWater level sensor error
- 1HCHeater error (Upper washer)
- 1HC1Heater error (Upper washer)
- 1LCWater leakage error (Upper washer)
- 1LC1Overflow error (Upper washer)
- 1OCOverflow error (Upper washer)
- 1SSystem error (Upper washer)
- 1SUdFoaming detected (Upper washer)
- 1tC1Temperature sensor error (Upper washer)
- 1tC4Temperature sensor error (Upper washer)
- 1UBUnbalance error (Upper washer)
- 2Imbalance error
- 2044Work windings open
- 2046Capacitor open
- 2048Motor shorted
- 2145Timer does not advance
- 2148Timer open
- 2EPower error
- 3Drain error
- 3CMotor driving error and hall sensor error
- 3EMotor driving error
- 3E1Hall Sensor error
- 3E2Motor overloaded due to too much laundry (non-sensing)…
- 3E3PBA connector terminal not connected, motor spin net not…
- 3E4Motor error
- 4Overflow error
- 4CWater supply error
- 4C2Water supply check occurring if PCB terminal from drain…
- 4EWater supply error caused by foreign material in the water…
- 4E1Hot water supply error during drying
- 4E2Water supply error
- 4EdWater supply error during dry cycle where water temperature…
- 5Pressure sensor error
- 5CDrain error
- 5EDrain error caused by damaged pump motor impeller, wrong…
- 6Door open error
- 6CPower error due to consumer power conditions, under or over…
- 6EWater Heater Error
- 7Heating error
- 7EHall sensor error indicating the motor hall sensor is not…
- 8Locked Motor Error
- 888Water level error
- 8CMEMS PBA error detected or data error detected; may also…
- 8C1MEMS PBA check detected or data check detected due to wire…
- 8C2Main PBA wire connection error or PBA silver nano part…
- 8EClutch motor error where the clutch position is not…
- 8E1MEMS PBA error detected or data error; check wire…
- 8E2Rear MEMS sensor PBA error
- 9Locked motor error
- 9CPower error due to under or over voltage supply, use of…
- 9C1Power error
- 9C2Power error
- 9EOvervoltage or low-voltage error
- 9E1Power error
- 9E2Power supply undervoltage
- ACCommunication error
- AC2Communication check error where signals between the DR…
- AC3Communication error between the WIFI Module and main PBA…
- AC4Communication error between the LCD Module and main PBA…
- AC5Communication error between the Inverter PBA and main PBA…
- AC6Communication check between Inverter PBA and main PBA not…
- AC7Communication error
- AECommunication error
- AE3Communication error between the DR Module and main PBA…
- AE4Communication error between the WIFI Module and main PBA…
- AE5Communication error between the LCD Module and main PBA…
- AE6Communication error between the Inverter PBA and main PBA…
- AOAuto Off relay failure
- AUTO OFFAuto Off relay is out of order; indicated by BLUE(BL) 1-pin…
- Auto Off ErrorAuto Off relay is out of order; Blue (BL) 1-pin connector…
- BALL PRESSURE SENSORBall Pressure Sensor is disconnected or defective…
- Ball Pressure Sensor ErrorBall Pressure Sensor is disconnected; indicated by all…
- BCSwitch check
- bC2Switch error (Main Relay Error)
- bEMotor error caused by erroneous operating signals from the…
- bE1Switch error where the Power button is pressed continually…
- bE2Switch error (Main Relay Error) where Power button is…
- bE3Main relay error
- BPBall Pressure Sensor is disconnected or defective (all…
- BRBrake resistor error.
- bSBall sensor error
- C1Water level sensor fault
- C2Motor driving check
- C3Motor hall sensor check
- C4Water supply check
- C5Water supply check
- C6Drain check
- C7Mems PBA check
- C8Mems PBA main PBA wire connection check or PBA silver nano…
- C9MEMS PBA check
- CCPower check
- CdCoupling error.
- CELock error
- CH01Indoor temperature sensor open/short circuit fault.
- CLLid locked error
- COCoupling error during operation.
- CPCoupling error.
- CrClutching error.
- CVSupplied voltage is not correct
- d75Dryer
- d80Dryer
- d90Dryer
- d95Dryer
- DCDoor check
- DC1Door check error caused by incorrectly connected door lock…
- DC2Door check caused by door lock switch unit issues; occurs…
- DC3Door check during boil wash
- dC4Door error (Upper washer inner door open)
- dCLDoor open error
- DDCAdd door is opened; door error related to add door switch…
- dEDoor error (before operation)
- dE1Door error
- dE2Door error
- dE3Door/lid error
- dE4Dryer error where Main Micom detects door close while…
- dEzDoor open error
- dFWasher failed to lock the door.
- dHDry heating error
- dHEDryer heater error
- dLDoor error (during operation)
- dnPedestal washer is being operated without a full-size…
- DODoor open error
- doorDoor being not opened
- DOOR ErLid opened during washing procedure (wash, rinse, spin) or…
- DOOR LOCKDoor is not closed properly.
- DOOR OPENLid is opened during intermittent spin, normal spin, or…
- Door Open ErrorLid is opened during intermittent spin, normal spin, or…
- DRDrainage error
- DRAINThe water level does not go below RESET even 15 minutes…
- DRAIN ErDrain is not finished within 12 minutes during drain course.
- Drain errorWater level does not decrease to the reset point within 15…
- DRAINAGEWater is not completely drained within 10 minutes…
- Drainage ErrorWater is not completely drained within 10 minutes…
- drnDryer failed to drain water.
- dSDoor error (before operation) caused by a switch contact…
- dVDrain valve problem
- EWater supply error
- E-02Cooking time setting over error for microwave (MWO) mode.
- E-03Cooking time setting over error for grill mode.
- E-04Cooking time setting over error for convection mode.
- E-05Cooking time setting over error for combination mode.
- E-06Swing heater detection error
- E-0bCooling fan motor error
- E-11Gas sensor open error
- E-12Gas sensor short error.
- E-13Gas sensor T1 max time error
- E-14Gas sensor dry up / no load error
- E-21Temperature sensor open error
- E-22Temperature sensor short error.
- E-23Temperature sensor T1 max time error
- E-24Over temperature error
- E-25Abnormal temperature sensed at microwave cook mode
- E-26Temperature not rising above fixed AD value in first 3…
- E-27Temperature sensor open error variant.
- E-28Temperature sensor short error variant.
- E-29Temperature sensor open error variant.
- E-2ATemperature sensor short error variant.
- E-2BPCB temperature sensor open error
- E-2CPCB temperature sensor short circuit error
- E-31Weight sensor open error
- E-32Weight sensor short error.
- E-33Weight sensor error
- E-34Weight sensor error
- E-35Weight sensor error
- E-36Door opens during sensor cooking (weight sensor mode).
- E-41Easy/PH sensor open error.
- E-42Easy/PH sensor short error.
- E-43Easy/PH sensor T1 max time error.
- E-44Easy/PH sensor dry up error.
- E-45Easy/PH sensor cooling error
- E-46Easy/PH sensor primary open error (3 minutes).
- E-47Door opens during cooking (PH sensor mode).
- E-51EEPROM open error
- E-53EEPROM read/write error.
- E-54EEPROM zero not to be set error.
- E-61Humidity sensor open error.
- E-62Humidity sensor short error.
- E-63Humidity sensor T1 max time error.
- E1Water Supply Error
- E2Switch error (main relay error) caused by the Power button…
- E3Motor Driving Error and Hall Sensor Error
- E4Unbalance Error
- E5Water heater error
- E6Heater overheated error
- E7Pressure Switch Assembly Error
- E8Abnormal Water Temperature Error
- E9Water Leakage Error
- EAAbnormal Water Temperature Error
- EBMotor Triac Short Error
- EcThermistor Error
- EdAbnormal water temperature error
- Ed1Breakdown detergent pump
- Ed2Open circuit detergent pump
- Ed3Breakdown softener pump
- Ed4Open circuit softener pump
- Ed5Automatic detergent injection pump connector missing or…
- EEErroneous operating signals from motor hall sensor, IPM…
- EE1Switch error
- EE2Switch error
- EE3Main relay of PBA is short-circuited, main relay terminal…
- EEEEModel option Error detected during Quick Test Mode.
- EEPROMEEPROM error
- EgEEPROM I/O test passed; no error detected.
- EILocked motor error
- EPEEPROM error
- ErAmbient temperature sensor failure
- EtEEPROM I/O error detected during PCB test mode; displayed…
- F1Dry ignition detection
- F5Dryer drainage pump doesn't work well
- FEDry duct fan error
- FFNFC module error
- FLDoor lock fail
- gASGas supply or service turned off (gas dryer model only).
- GFUnbalance error
- H1Thermistor dry error
- H2Thermistor wash error
- H3Thermistor dry overheating error
- H4Thermistor wash overheating error
- H5Water temperature error
- H6Heater wash error
- H7Heater dry error
- H8Heater wash overheating error
- HCHeater check error caused by washing heater short-circuit…
- HC1Heater error
- HC2Water level sensor operates without water (freezing or…
- HEHeater overheat error
- HE1Heater error
- HE2Dry heater malfunction
- HE3Heater relay error
- HIAmbient temperature reading above 50°C; displayed when…
- HrHeater relay error
- HSPedestal washer is being operated without a full-size…
- IEWater supply error
- IFWithout filter
- IMBALANCELoad is out of balance; the appliance imbalance detection…
- INLET ErWater supply does not reach the set level within 60 minutes.
- ISIce Maker Sensor failure or Water Tank Sensor failure.
- LAUNDRY AMOUNT SENSORIn the second QC mode a laundry amount sensor error is…
- LCWater leakage error
- LC1Water leakage check
- LEWater leakage error
- LE1Water level sensor error caused by damaged, clogged, or…
- LE2Compressor is restricted
- LE3Fan motor detects lock (Fan Error Code 71).
- LODoor unlock fail
- MOTOR ERRORMotor error
- nCNFC module error
- ndDrain error caused by damaged pump motor impeller, wrong…
- nENozzle (Vario) error
- nFWater Supply Error
- nF1Water supply error in Wool course
- NO DRAINWater is not completely drained within 12 minutes
- NO INLEWater supply error
- NO INLETWater level does not rise to the set level within 30…
- nPNot enough voltage from outlet (lower than 240V)
- nSDoor error before operation (USA variant) indicating door…
- nUNFC version error
- OCOverflow error
- OEOverflow error where water is supplied continually because…
- OE (overflow)Overflow error
- OFOverflow error
- OPnDrawer open error
- OVER FLOODINGOverflooding error displayed during the second QC Mode…
- Over Flooding ErrorDetected during second QC Mode; all process LEDs blink…
- Overflow errorOverflow condition rises for three times.
- PCClutch motor error when position of the clutch cannot be…
- PC1Clutch sensor check
- PEClutch motor hall sensor error where after completion of…
- PE1Clutch motor hall sensor error where after clutch position…
- PFPower failure
- PFEPump filter error
- PH1Power error due to under or over voltage supply, or use of…
- PloPower error
- PoFPower failure compensation
- PRESSURE SENSORSignal continuously ringing
- PSDryer power supply wire connection is wrong or loose…
- rEOver load in motor.
- SSystem error
- SdSuds error
- SELocked motor error
- SFSystem error in case of EEPROM detected fault or PBA…
- SF2System check
- SF3System check
- SPIN ErUnbalanced water or load detected during spin procedure.
- SrSwitch error
- StackEPedestal washer is being operated without a full-size…
- StucForeign object such as coin, pin, or clip is stuck in the…
- SudFoaming detected
- SUDSFoaming detected
- svdOversudsing detection
- TCTemperature sensor check
- tC1Temperature sensor error (washing)
- TC2Temperature sensor check error caused by dry temperature…
- TC3Heater sensor fault
- tC4Temperature sensor error
- tcLTub Clean alarm
- tETemperature sensor error
- tE1Temperature sensor error
- tE2Temperature sensor error
- tE3Temperature sensor error where the duct condensing…
- tE4Steam generator thermistor open or shorted (displayed in…
- TE5Eva Out temperature is abnormal (detected below -30 degrees…
- tHTemperature sensor error
- tSTemperature sensor fault
- tS2Dryer compressor discharge pipe thermistor temperature…
- UBUnbalance error
- UcPower error
- UEUnbalance error
- UNBALANCELaundry unbalance detected during spin; indicated by Wash…
- Unbalance ErrorLaundry unbalance detected during spin; indicated by Wash…
- uSVibration sensor error
- UVUnbalance error caused by motor hall sensor fault or…
- VSVibration sensor error
- WATER ERRWater supply error
- WATER LEVEL SENSORThe water level frequency stays over 30.0KHz or below…
- Water level sensor errorWater level sensor fails to send signal for longer than 15…
- WATER SUPPLYWater is not supplied up to the selected level even 60…
- WATER SUPPLY & INLET V/VWater level does not rise to the set level within 40…
- Water supply errorNo frequency change for 60 minutes from water supply (water…
- water supplying ErrorThe water level does not reach the selected water level…
- WIFIWIFI Modem is not connected or WIFI Modem Self Check…
- WSWater supply/inlet valve error
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