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LG LDF8874ST Service Manual
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LG LDF8874ST Service Manual

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DISHWASHER
SERVICE MANUAL
NOTE
BEFORE SERVICING THE UNIT, PLEASE READ THIS MANUAL CAREFULLY
FOR SAFETY AND CORRECT SERVICES.
For Authorized Service Technician
MODEL : LDF8874ST
LDF8764ST
LDF7774ST/WW/BB

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Summary of Contents for LG LDF8874ST

  • Page 1 DISHWASHER SERVICE MANUAL NOTE BEFORE SERVICING THE UNIT, PLEASE READ THIS MANUAL CAREFULLY FOR SAFETY AND CORRECT SERVICES. For Authorized Service Technician MODEL : LDF8874ST LDF8764ST LDF7774ST/WW/BB LDS5774ST...
  • Page 3 For Authorized Service Technician CONTENTS CONTENTS 1. CAUTION......................... 4 2. SPECIFICATIONS ......................5 3. FEATURES & TECHNICAL EXPLANATION ..............6 4. PARTS NAME ........................ 13 5. PROGRAM CHART ..................... 14 6. HOW TO DISASSEMBLE .................... 16 7. TROUBLE SHOOTING METHODS................25 A.
  • Page 4 For Authorized Service Technician CAUTION ! DISCONNECT POWER CORD BEFORE SERVICING RECONNECT ALL GROUNDING DEVICES IMPORTANT SAFETY NOTICE ! This service information is intended for individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair this appliance may result in personal injury and property damage.
  • Page 5 For Authorized Service Technician 2. SPECIFICATION 2. SPECIFICATION SPECIFICATION ITEM Rated Voltage / Frequency AC 120V/60Hz Installation Built-In Place Settings Product Dimension(in) 23 3/4"x 24 5/8"x 33 1/2" Product Weight(lbs) 114lbs Door Color White, Black, Stainless Tub Material Stainless Steel Control Electronic Rated Power(Watt)
  • Page 6 For Authorized Service Technician 3. FEATURES & TECHNICAL EXPLANATION 3-1. Product Features LARGE CAPACITY STEAM WASHING (not available on all models) LG dishwashers allow Steam technology pro- you to load very large vides better cleaning items in both the upper performance than regu- and lower racks.
  • Page 7 For Authorized Service Technician LDF8874 / LDF8764 3-2. Display Panel CONTROL PANEL (steam models) Steam Models (LDF8874, LDF8764) Cycles TO CANCEL A CYCLE To cancel a cycle, open the door and then press and hold the Select your desired cycle. Delicate and Dual Control Buttons together for approximate- Auto ly three seconds.
  • Page 8 For Authorized Service Technician LDF7774 / LDS5774 CONTROL PANEL (non-steam models) Display varies by model (LDF7774) Display varies by model (LDS5774) Cycles Normal This cycle is for normally soiled, everyday loads. Select your desired cycle. Quick & Dry Auto This is a shortened cycle that is intended for washing and dry- This cycle senses the load size, soil amount and soil tough- ing recently used dishes or lightly soiled loads.
  • Page 9 3. Select the cycle (and desired options). it has the capability of transmitting data to your Smart Phone using the LG Smart Laundry & DW Application or via your 4. Press and hold the Rinse and Spray buttons for three sec- telephone to the LG call center.
  • Page 10 Smart Phone delay time will increase an hour. The delay start time can be using the LG Smart Laundry & DW Application or via your tele- set from 1 to 19 hours, in one-hour increments.
  • Page 11 For Authorized Service Technician LDF8874/LDF8764 3-3. TEST MODE CHECK PROGRAM Load and Checking points The number of Door open/ BUTTON Top Display Remark pushing button closed Load LED lighting Auto+ N03/U00/D00 1 TIME All LEDs are lighting Either Heavy+POWER (Version) Steam Steam 1 TIME...
  • Page 12 For Authorized Service Technician LDF7774/LDS5774 CHECK PROGRAM Load and Checking points The number of Door open/ Button Top Display Remark pushing button closed Load LED lighting Auto+ Heavy+ No3/U01/D01 All LEDs are LDF7774 1 TIME Either POWER (Version) lighting Series only HALF LOAD + No3/U02/D01 All LEDs are...
  • Page 13 For Authorized Service Technician 5. PARTS NAME 4. PARTS NAME 1. CONTROL PANEL 2. DOOR HANDLE Mesh filter 3. FRONT COVER 4. LOWER COVER 5. LEVELING FEET Outer filter Upper STS 7. BASE filter 8. TOP SPRAY ARM SignaLight (front display) 9.
  • Page 14 For Authorized Service Technician 5. PROGRAM CHART (SCHEMATIC DIAGRAM) LDF8874/LDF8764 - 14 -...
  • Page 15 For Authorized Service Technician LDF7774/LDS5774 - 15 -...
  • Page 16 For Authorized Service Technician 6. HOW TO DISASSEMBLE 7. HOW TO DISASSEMBLE BEFORE DISASSEMBLING THE DISHWASHER ; 1) Remove the cord from electric outlet to avoid electric shock. 2) Close the Water Tap (faucet). 3) Remove all dishes and items in the dishwasher. 4) Remove the Lower Rack and the Upper Rack.
  • Page 17 For Authorized Service Technician (LDF**** Series) 3. Door Assembly 1) Front Cover Open the door. Remove 2 screws at the bottom. Remove 12 screws(stainless). Control Panel Front Cover 2) Control Panel Assembly Remove 2 screws(Stainless). Remove the wire connections. Be sure the wiring should not be changed in reassembling Remove the Latch assembly.
  • Page 18 For Authorized Service Technician (LDS**** Series) 3-1. Door Assembly 1) Front Cover ① Open the door. ② Remove 2 screws at the bottom. ③ Remove 6 screws(stainless). Control Panel Front Cover 2) Control Panel Assembly ① Remove 8 screws(Stainless). ② Remove the wire connections. Be sure the wiring should not be changed in reassembling.
  • Page 19 For Authorized Service Technician 3) Fan Assembly Gasket Inner Cover Open the door. Detergent Remove 4 screws and a earth screw for Dispenser Fan Assembly Door Bracket. Remove the wire connetions. Remove the Air Duct. Air Duct Turn the Inner Cover counterclockwise. Hose 4) Detergent Dispenser Flange...
  • Page 20 For Authorized Service Technician 4. Lower Frame 1) Press the holder hook as shown in figure. 2) Remove 4 screws. 3) Hold the lower frame by one hand. Push the base cabinet inside from other hand. Pull the lower frame out. Lower Frame Lead Wire Holer Lead Wire Holer Hook...
  • Page 21 For Authorized Service Technician 3) Sump Assembly ① Remove the wire connections. ② Remove 2 hoses assembly. ③ Rotate 2 holders between sump and tub. ④ Lift up sump assembly. ⑤ Remove the wire connections in the back of the sump assembly. 4) Air guide Nut ①...
  • Page 22 For Authorized Service Technician 6) Steam Nozzle ① Remove side 4 screws. ② Push the steam nozzle. 7) Holder Supporter, T ub Packing and Hinge Supporter Assembly. Rotate the screwdriver, after slide it into the gap between Stopper Roller and Rail Roller. - 18 - - 18 - - 22 -...
  • Page 23 For Authorized Service Technician 7) Foot & Nut Pull the Foot twisting Pull the Nut pushing the hook. Foot 8) Rear Leg Adjustment System Holder Remove 2 screws. Pull the Holder. Leg Adjust Pull the Leg Adjust. Pull the Shaft Assembly . Shaft Assembly Shaft Assembly - 20 -...
  • Page 24 For Authorized Service Technician 7. Sump Assembly 1) Heater ① Remove the wire connections. ② Pull the heater out of the sump after releasing the nut. 2) Pressure Switch & Soil Sensor ① Remove the wire connections. ② Disconnect 1 hose assembly. ③...
  • Page 25 For Authorized Service Technician 7. TROUBLE SHOOTING METHODS 8.TROUBLE SHOOTING METHODS A. TROUBLE SHOOTING ACCORDING TO DISPLAYED ERROR MESSAGE POSSIBLE CAUSE ERROR MESSAGE REMEDY FOR ERROR OCCURRENCE Take action on Water Supply The Water Supply Tap is closed. The Water Supply is shut off. device.
  • Page 26 For Authorized Service Technician POSSIBLE CAUSE ERROR MESSAGE REMEDY FOR ERROR OCCURRENCE EXCESS ERROR The Inlet Valve is troubled. Replace the Inlet Valve. The Controller is troubled. Repair or replace the Controller displayed The float assembly is not working Change the float assembly. Condition Excessive water is sup- plied than normal water...
  • Page 27 For Authorized Service Technician B. STEAM GENERATOR ERROR MESSAGE Steam Generator Error mode is not displayed in normal condition and it can be confirmed by following additional operation. To confirm steam generator error, press the SPRAY and HALF LOAD buttons simultaneously. When Steam Generator is out of order, dishwasher operates the selected cycle without steam.
  • Page 28 For Authorized Service Technician 7. TROUBLE SHOOTING METHODS Inlet Error Condition. Not reached to the normal water level in spite of 10 min. water supply. displayed? Does the water supplied? The water is supplied. The water is not Check the frequency of Inlet Water by Frequency is not increased supplied.
  • Page 29 For Authorized Service Technician Drain Error Condition. Not fully drained out in spite of 5 min. displayed? drain operation. Does the drain motor operate? Motor rpm is Motor rpm is not increased. Check the rpm of drain motor by the increased.
  • Page 30 For Authorized Service Technician Leakage Error Condition. The water level in Tub goes down displayed? during operation or standby mode. Is the water flooded in the base? Water is not flooded Water is flooded in the base. in the base. How to check.
  • Page 31 For Authorized Service Technician Excess Error Condition. Excessive water is supplied than normal water displayed? level. (Automatically drain Pump operated.) Is the water supplied when (Close the water tap.) the machine is shut down? Is the connector connected to Does the inlet valve Reconnect or Replace the inlet valve main PCB assembly disconnected...
  • Page 32 For Authorized Service Technician Thermal Error Condition. The resistance of thermistor not displayed? normally out put. Is the connector Reconnect Is the connector Reconnect connected to main PCB or repair the connected to heater or repair the assembly disconnected or connector.
  • Page 33 For Authorized Service Technician Heater Error Condition. The water is not heated or the temperature in the inner tub is displayed? overheated to over 95℃ Is the heater resistance Measured properly? (range is 11~12.5Ω) Is the connector connected Reconnect or Does the inlet valve to main PCB assembly repair the...
  • Page 34 For Authorized Service Technician Replace the PCB Does the PCB assembly assembly working properly? When door is closed, check the resistor between X1 4pin and X2 4pin. -. Heater working : 120V AC 15% -. Heater stop : 0~1V Is the pressure S/W Replace the pressure S/W.
  • Page 35 For Authorized Service Technician Locked motor Error Condition. The revolution of washing motor is displayed? not increased. Check the connectors below. Reconnect Check or Is the connector disconnected or or repair the replace the Is the resistance values disassembled? connector. motor.
  • Page 36 For Authorized Service Technician Nozzle(Vario) Error Condition. The position of vario cam is not displayed? properly. Check the connectors below. Reconnect Does the vario S/W assembled properly? Reassemble Is the connector or repair the vario S/W. disconnected or disassembled? connector. (BL4 : vario motor, NA8 : Vario S/W sensing) Is the vario motor operated properly?
  • Page 37 For Authorized Service Technician No Power Is the supplied voltage Check the Reconnect 120V AC(+10%, -15%) fuse or reset Is the connector connected to Main PCB or repair the the circuit Assembly disconnected or disassembled? connector. breaker. Replace the Alternate Is LED on while the power is on? main PCB Is the current rating of multi-outlet power...
  • Page 38 For Authorized Service Technician Washing result is not satisfactory. After washing, is there Using a wash booster will help any white deposits remove spots, residue and hard on the dishes or inner tub? water (white) film. After washing, is there Reduce the amount of Rinse aid.
  • Page 39 For Authorized Service Technician Drying result is not satisfactory. After washing, is there Reduce the amount of Rinse aid. any streaks on the dishes or inner tub? After washing, is there Increase the amount of Rinse aid. water drops on the dishes or inner tub? Is the drying result of a) Does the upper nozzle fit properly...
  • Page 40 For Authorized Service Technician C. TROUBLE DIAGNOSES AND REPAIR BY SYMPTOM No Power on when the power button pressed. • Re-connect the Powr connection. The Power connection is correctly connected. • Check the electricity is failed or not. The Fuse or Circuit Breaker •...
  • Page 41 For Authorized Service Technician The Wash Pump/Motor does not run. • close the Door tightly. The Door is tightly closed? • Check the Door Switch in Latch Handle. • Re-connect the wiring connections related to the The Wiring connections is OK? Washing Motor.
  • Page 42 For Authorized Service Technician Washing Results are not Satisfactory After washing, are there still White deposits or streaks on Reduce the amount of Rinse-Aid the dishes? (for Streak) After washing, are there still food soils on the dishes? Check that : - the amount of detergent Correctly used or not - Filters clogged or not.
  • Page 43 For Authorized Service Technician Power Button not automatically off after operation. Check the button is blocked by foreign materials. Check the Power Switch.(Replace it, if necessary.) Check the Controller.(Replace it, if necessary.) - 28 - - 28 - - 43 -...
  • Page 44 For Authorized Service Technician 9. INSTALLATION INSTRUCTION 8. INSTALLATION INSTRUCTION Step 1: PREPARE CUPBOARD OPENING 1. This dishwasher is designed to fit a standard dishwasher opening as shown below. 2. Select a location as close to sink as possible for easy connections to water and drain lines. 3.
  • Page 45 For Authorized Service Technician Step 2: PREPARE THE ELECTRICAL WIRING WARNING For personal safety, remove house fuse or open circuit breaker before installation. Do not use an extension cord or adapter plug with this dishwasher. Electrical and grounding connections must comply with the national electrical code/provincial and municipal code and/or other local codes.
  • Page 46 For Authorized Service Technician Step 3: PREPARE THE WATER SUPPLY CONNECTION 1. This dishwasher may be connected to either hot or cold water. If the water can not be maintained below 149 (65 ), the dishwasher must be connected to cold water. 2.
  • Page 47 For Authorized Service Technician Step 5: INSTALL THE DISHWASHER IN CUPBOARD 1. Remove the Lower Cover and orient dishwasher as shown below. 2. Before sliding the dishwasher into the cupboard opening, make all necessary height adjustments using the legs. 3. Slide the dishwasher into the cabinet opening carefully. Make sure that the drain hose inside the cabinet is not kinked.
  • Page 48 For Authorized Service Technician Step 6: DRAIN LINE CONNECTION 1. If the end of the drain hose does not fit to the drain line, use an adapter (not supplied) that must be resistant to heat and detergent and may be obtained from a plumbing shop. 2.
  • Page 49 For Authorized Service Technician Step 7: WATER SUPPLY CONNECTION 1. When connecting, sealing tape or sealing compound should be used to avoid water leaks. 2. Before connecting, turn off the water supply. Inlet Valve 3. After fitting the Elbow into the Elbow Inlet Valve, slide the Flexible Stainless Tube or Copper Tube...
  • Page 50 For Authorized Service Technician Step 9: FINAL CHECKS 1. Turn electrical power back on at the circuit breaker. 2. Turn house water supply back on. 3. Operate the dishwasher through one cycle (Quick cycle is recommended) to check for water leaks and operating conditions. 4.
  • Page 51 For Authorized Service Technician 9. EXPLODED VIEW 10. EXPLODED VIEW “The following parts are not illustrated" Description Loc No. *Owner’s Manual G001 Printed materials *Energy Label G002 *Service Manual G004 - 51 -...
  • Page 52 For Authorized Service Technician LDF8874 EXPLODED VIEW EXPLODED VIEW E005 E010 F101 F001 A040 A003 A130 M050 M053 M051 E005 M052 M054 - 52 - - 37 - - 37 -...
  • Page 53 For Authorized Service Technician LDF8764 EXPLODED VIEW EXPLODED VIEW E005 E010 F101 F001 A040 A003 A130 M050 M053 M051 E005 M052 M054 - 37 - - 37 - - 53 -...
  • Page 54 For Authorized Service Technician LDF7774 / LDS5774 EXPLODED VIEW EXPLODED VIEW E005 F101 E010 F001 A040 A003 A130 M050 M053 M051 ACCESSORIE S E005 M052 M054 - 37 - - 37 - - 54 -...
  • Page 55 For Authorized Service Technician LDF8874 EXPLODED VIEW - TUB ASSEMBLY EXPLODED VIEW - TUB ASSEMBLY F110 F113 F117 F040 F060 F111 F050 F112 F022 F117 F230 F111 F300 F210 F041 F118 F113 F171 F011 F013 F144 F132 F137 F143 F166 F138 F117 F165...
  • Page 56 For Authorized Service Technician LDF7774 / LDS5774 EXPLODED VIEW - TUB ASSEMBLY EXPLODED VIEW - TUB ASSEMBLY F110 F113 F117 F111 F060 F040 F112 F117 F050 F111 F022 F210 F118 F113 F041 F171 F011 F013 F144 F132 F137 F143 F166 F138 F117 F215...
  • Page 57 For Authorized Service Technician LDF8764 EXPLODED VIEW - TUB ASSEMBLY EXPLODED VIEW - TUB ASSEMBLY F060 F040 F050 F230 F300 F022 F041 F171 F011 F013 F144 F132 F137 F143 F166 F138 F117 F165 F215 F117 F011 F105 M006 M070 F013 M071 - 57 - - 38 -...
  • Page 58 For Authorized Service Technician LDF8874 / LDF8764 EXPLODED VIEW - BASE ASSEMBLY EXPLODED VIEW - BASE ASSEMBLY F047 M500 F046 M210 M090 M100 A160 M260 F149 M266 M105 F148 - 58 -...
  • Page 59 For Authorized Service Technician LDF7774 / LDS5774 EXPLODED VIEW - BAS E ASSEMBLY EXPLODED VIEW - BASE ASSEMBLY M090 M100 A160 F148 M260 M210 F149 M266 M105 - 39 - - 39 - - 59 -...
  • Page 60 For Authorized Service Technician EXPLODED VIEW - RACK ASSEMBLY EXPLODED VIEW - RACK ASSEMBLY F192 F004 A165 A159 A156 A080 A151 F005 A157 A158 A145 A155 A070 A101 A102 A060 A103 A150 A050 F191 A110 A141 A147 A146 A142 A140 - 60 -...
  • Page 61 For Authorized Service Technician LDF8874 / LDF7774 / LDS5774 EXPLODED VIEW - CUTLERY RACK ASSEMBLY EXPLODED VIEW - CUTLERY RACK ASSEMBLY A170 A171 A172 A152 - 61 -...
  • Page 62 For Authorized Service Technician LDF8874 / LDF8764 / LDF7774 EXPLODED VIEW - PANEL / DOOR ASSEMBLY K260 K207 K215 K280 K270 K280 K251 K254 K110 K121 K222 K122 K230 K101 K001 K100 K124 K005 K002 K141 K010 K140 F142 F141 F174 K030 - 62 -...
  • Page 63 For Authorized Service Technician LDS5774 EXPLODED VIEW - PANEL / DOOR ASSEMBLY K200 K212 K006 K262 K254 K260 K222 K252 K251 K280 K030 K110 K121 K122 K101 K001 K100 K124 K217 K002 K141 K140 F142 F141 F174 - 63 -...
  • Page 64 For Authorized Service Technician EXPLODED VIEW - SUMP ASSEMBLY A120 M072 M070 M074 M125 M120 M071 M025 M126 M081 M087 M089 M075 M031 M091 M028 M060 M026 M027 M006 M030 M130 M088 M131 M133 M132 M134 - 64 -...
  • Page 65 For Authorized Service Technician 10. WIRING DIAGRAM (LDF8874,LDF8764 Series) - 65 -...
  • Page 66 For Authorized Service Technician (LDF7774, LDS5774 Series) - 66 -...
  • Page 67 For Authorized Service Technician - 67 -...
  • Page 68 For Authorized Service Technician P/No. : MFL37554813 - 68 -...

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