LG LDF7774ST LDF7774BB LDF7774WW Dishwasher Service Manual and Repair Guide

DISHWASHER SERVICE MANUAL BEFORE SERVICING THE UNIT, PLEASE READ THIS MANUAL CAREFULLY FOR SAFETY AND CORRECT SERVICES. NOTE For Authorized Service Technician MODEL : LDF8874ST LDF8764ST LDF7774ST/WW/BB LDS5774ST

For Authorized Service Technician - 3 - 1. CAUTION ......................................................................................................................... 4 2. SPECIFICATIONS ........................................................................................................... 5 10. WIRING DIAGRAM ........................................................................................................ 65 3. FEATURES & TECHNICAL EXPLANATION ................................................................... 6 4. PARTS NAME ................................................................................................................ 13 5. PROGRAM CHART ..................................................................................................... 14 6. HOW TO DISASSEMBLE ............................................................................................ 16 7. TROUBLE SHOOTING METHODS .............................................................................. 25 A. TROUBLE SHOOTING ACCORDING TO DISPLAYED ERROR MESSAGE ...........25 B. STEAM GENERATOR ERROR MESSAGE ............................................................ 27 C. TROUBLE DIAGNOSES AND REPAIR BY SYMPTOM .......................................... 40 8. INSTALLATION INSTRUCTION ................................................................................... 44 9. EXPLODED VIEW .......................................................................................................51 CONTENTS

For Authorized Service Technician - 4 - 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. The manufacturer or seller can not be responsible for the interpretation of this information, nor can it assume any liability in connection with its use. CAUTION !

For Authorized Service Technician - 5 - Rated Voltage / Frequency AC 120V/60Hz Installation Built-In Place Settings 14 Product Dimension(in) 23 3/4"x 24 5/8"x 33 1/2" Product Weight(lbs) 1 14lbs Door Color White, Black, Stainless Tub Material Stainless Steel Control Electronic Rated Power(Watt) 1,350 Heater Power(Watt) 1,200 Programs 6 (LDS5774 : 7) Upper Rack Position Adjustable Lower Rack 100 % Fold down Water Consumption 6.5 – 20.5 (Normal) Power Consumption(kWh/year) 258 (Nomal) Operating Time (min) 110 – 130 (Normal) Fan Dry System Yes Delay Start Function Yes Auto-Off Power Switch Yes Process Monitor Yes Wash Level 5 Racks Nylon Coating Operating Water Pressure (Bar) 20-120 (140-830kPa) ITEM SPECIFICATION 2. SPECIFICATION

For Authorized Service Technician - 6 - 3. FEATURES & TECHNICAL EXPLANATION 3-1. Product Features LARGE CAPACITY LG dishwashers allow you to load very large items in both the upper and lower racks. The tall tub provides extra overall capacity and the clearance to accommo- date large dishes. Extra large items (max. 14 in.) may be loaded in the lower rack by raising the upper rack. HYBRID DRYING SYSTEM This system effectively dries dishes without the use of a heating element that would increase energy consumption. STEAM WASHING (not available on all models) Steam technology provides better cleaning performance than regu- lar wash systems. Steam is the most energy ef- ficient gentle care for your finest china and stemware. VARIABLE SPRAY SYSTEM Because the water spray alternates between the upper and lower racks, all of the power from the motor is directed to one rack at a time. This concentrates all the cleaning power of the motor on each rack in turn. LIGHT TOUCH BUTTONS The light touch buttons on the control panel make selections easy and convenient.

For Authorized Service Technician - 7 - LDF8874 / LDF8764 3-2. Display Panel CONTROL PANEL (steam models) Cycles Select your desired cycle. Auto This cycle senses the load size, soil amount and soil tough- ness. This cycle is optimized to achieve the best cleaning. Heavy This cycle is for heavily and hard soiled dishes. Heavy defaults to the highest spray intensity and uses the power of steam to wash heavily soiled dishes. Delicate This cycle adds the gentle power of steam to boost the cleaning power of the delicate cycle. The cycle is intended for effectively cleaning delicate items such as fine china and stemware. Dual Control This cycle washes the upper and lower racks at different spray intensities. The default setting for this cycle washes the lower rack with strong spray intensity and the upper rack with soft spray intensity. This provides optimum cleaning performance for mixed loads, including fine china and stemware. If other combinations are desired, use the steps listed below to change the intensities or to use the Half Load feature. How To Use Dual Control: 1. Select Dual Control. 2. Press the Spray button to toggle between Soft, Medium and Strong for the upper spray arm. 3. After making your selection for the upper spray arm, press the Half Load button. 4. Press the Spray button to toggle between Soft, Medium and Strong for the lower spray arm. 5. Close the door to start the cycle. Normal This cycle is for normally soiled, everyday loads. Quick & Dry This is a shortened cycle that is intended for washing and drying recently used dishes or lightly soiled loads. During this cycle, both spray arms will run at the same time. CHIME ON/OFF To enable or disable the chime, first, turn on the dishwasher. Press and hold the Delicate and Quick&Dry Buttons simultaneously for approximately three seconds. TO CANCEL A CYCLE To cancel a cycle, open the door and then press and hold the Delicate and Dual Control Buttons together for approximately three seconds. The drain pump will activate and the cycle will cancel. The display will show “dr” and the dishwasher will drain the water. After the dishwasher is drained, the power will turn off. If the power is turned on and no cycle has been selected, the dishwasher will power off within four minutes. Cycle Options (Refer to the control panel on the next page) Press the desired cycle and then select the options for that cycle. Extra Dry Select the Extra Dry option for better drying performance. This option adds 60 minutes of extra drying time to the cycle. The Extra Dry button will illuminate when the option has been selected. Rinse Repeated pressing of the Rinse button will select the desired Rinse option. The Sanitary, Extra Rinse, or Sanitary and Extra Rinse lights will show in the bottom left portion of the display. Sanitary ( ) This high-temperature rinse sanitizes dishes and glassware in accordance with NSF/ANSI Standard 184 for residential dishwashers. Certified dishwashers are not intended for licensed food establishments. Extra Rinse ( R + ) The Extra Rinse symbol indicates that an extra rinse has been added to the cycle. An extra rinse can help reduce hard water spotting on dishes. To add an extra rinse, press the Rinse button repeatedly until the Extra Rinse symbol appears in the display. Rinse Only (LDF****) This cycle is a quick rinse for dishes that will not be washed immediately. This cycle will rinse dishes that have excess soil to soften dried on residue. Rinsing the dishes will help prevent odors in the dishwasher. No detergent should be used. To select the Rinse Only cycle, turn the dishwasher on, and press the Rinse button once without pressing any other cycle buttons. The Rinse Only cycle is not available with any other cycles. Steam Models (LDF8874, LDF8764)

For Authorized Service Technician - 8 - LDF7774 / LDS5774 CONTROL PANEL (non-steam models) Cycles Select your desired cycle. Auto This cycle senses the load size, soil amount and soil tough- ness. This cycle is optimized to achieve the best cleaning. Heavy This cycle is for heavily and hard soiled dishes. Delicate The cycle is intended for effectively cleaning delicate items such as fine china and stemware. Dual Control This cycle washes the upper and lower racks at different spray intensities. The default setting for this cycle washes the lower rack with strong spray intensity and the upper rack with soft spray intensity. This provides optimum cleaning performance for mixed loads, including fine china and stemware. If other combinations are desired, use the steps listed below to change the intensities or to use the Half Load feature. How To Use Dual Control: 1. Select Dual Control. 2. Press the Spray button to toggle between Soft, Medium and Strong for the upper spray arm. 3. After making your selection for the upper spray arm, press the Half Load button. 4. Press the Spray button to toggle between Soft, Medium and Strong for the lower spray arm. 5. Close the door to start the cycle. Normal This cycle is for normally soiled, everyday loads. Quick & Dry This is a shortened cycle that is intended for washing and drying recently used dishes or lightly soiled loads. During this cycle, both spray arms will run at the same time. Rinse Only (LDS5774) This cycle is a quick rinse for dishes that will not be washed immediately. This cycle will rinse dishes that have excess soil to soften dried on residue. Rinsing the dishes will help prevent odors in the dishwasher. No detergent should be used. CHIME ON/OFF To enable or disable the chime, first, turn on the dishwasher. Press and hold the Delicate and Quick&Dry Buttons (LDS5774: Spray and Delay Start) simultaneously for approximately three seconds. TO CANCEL A CYCLE To cancel a cycle, open the door and then press and hold the Delicate and Dual Control Buttons (LDS5774: Spray and Half Load) together for approximately three seconds. The drain pump will activate and the cycle will cancel. The display will show “dr” and the dishwasher will drain the water. After the dishwasher is drained, the power will turn off. If the power is turned on and no cycle has been selected, the dishwasher will power off within four minutes. Display varies by model (LDF7774) Display varies by model (LDS5774)

For Authorized Service Technician - 9 - LDF8874 / LDF8764 / LDF7774 CONTROL PANEL Spray (INTENSITY) First, select the desired cycle. Press the Spray button repeatedly until the desired spray intensity is selected. Soft ( ), Medium ( ), Strong ( ) Half Load For small loads, you may use just the upper or lower rack to save energy. Each press of the Half Load button cycles between upper rack only and lower rack only. Delay Start The Delay Start feature allows you to delay the start of a selected cycle. Each time the Delay Start button is pressed, the delay time will increase an hour. The delay start time can be set from 1 to 19 hours, in one-hour increments. High Temp ON/OFF Raises the main wash temperature to improve cleaning. Press and hold the Extra Dry and Rinse buttons simultaneously for approximately three seconds. Child Lock The Child Lock feature helps prevent your settings from being changed during a cycle. Selecting this feature locks all of the buttons, except for the POWER button, on the control panel. This feature does not lock the door. To activate the Child Lock: 1. Open the dishwasher door. 2. Press the POWER button. 3. Select the cycle (and desired options). 4. Press and hold the Rinse and Spray buttons for three seconds. The Child Lock indicator will illuminate in the display once the Child Lock is activated. 5. Close the door to begin the cycle. Digital Display The Digital Display on the control panel shows the ESTIMAT- ED cycle time. When the dishwasher is powered up, the display will be blank. When the cycle and options are selected, the display will show the total estimated time to complete those selections. During operation, the display shows the remaining estimated operating time. • The estimated time shown in the display does not in- clude delay times for heating water, etc. • If Delay Start is selected, the display shows the delay time in hours. • Time may vary depending on the soil level of your load. NOTE Energy Saving The Energy Saving option saves energy by using less water. This option should only be used with light to medium soiled dishes. The RINSE AID symbol indicates that the rinse aid needs to be refilled. NOTE POWER • Press the POWER button to turn on the control panel. If no cycle is selected within four minutes, the dishwasher will power off. • After the cycle is complete, the power automatically turns off for purposes of safety and economy. • If there is a power surge, power outage, or disruption of any kind, the PF indicator will display and power will be automatically turned off for safety. The cycle will need to be restarted. Smart Diagnosis Should you experience any problems with your dishwasher, it has the capability of transmitting data to your Smart Phone using the LG Smart Laundry & DW Application or via your telephone to the LG call center. WARNING Steam can cause burns. Use caution in the area of the steam nozzle, on the left side of the dishwasher, if the door is opened during the steam portion of a cycle. Contact with the steam or the steam nozzle can cause burns. Display varies by model (LDF8874, LDF8764) Display varies by model (LDF7774)

For Authorized Service Technician - 10 - LDS5774 CONTROL PANEL Display varies by model (LDS5774) Cycle Options Press the desired cycle and then select the options for that cycle. Extra Dry ( ) Select the Extra Dry option for better drying performance. This option adds 60 minutes of extra drying time to the cycle. The Extra Dry button will illuminate when the option has been selected. Press and hold the Rinse and Spray buttons for three seconds. Rinse Repeated pressing of the Rinse button will select the desired Rinse option. The Sanitary, Extra Rinse, or Sanitary and Extra Rinse lights will show in the bottom left portion of the display. Sanitary ( ) This high-temperature rinse sanitizes dishes and glassware in accordance with NSF/ANSI Standard 184 for residential dishwashers. Certified dishwashers are not intended for licensed food establishments. Extra Rinse ( R + ) The Extra Rinse symbol indicates that an extra rinse has been added to the cycle. An extra rinse can help reduce hard water spotting on dishes. To add an extra rinse, press the Rinse button repeatedly until the Extra Rinse symbol appears in the display. Spray (INTENSITY) First, select the desired cycle. Press the Spray button repeatedly until the desired spray intensity is selected. Soft ( ), Medium ( ), Strong ( ) Half Load ( ) For small loads, you may use just the upper or lower rack to save energy. Each press of the Half Load button cycles between upper rack only and lower rack only. Delay Start The Delay Start feature allows you to delay the start of a selected cycle. Each time the Delay Start button is pressed, the delay time will increase an hour. The delay start time can be set from 1 to 19 hours, in one-hour increments. Child Lock The Child Lock feature helps prevent your settings from being changed during a cycle. Selecting this feature locks all of the buttons, except for the POWER button, on the control panel. This feature does not lock the door. To activate the Child Lock: 1. Press the POWER button. 2. Select the cycle (and desired options). 3. Press and hold the Half Load and Delay Start buttons for three seconds. The Child Lock indicator will illuminate in the display once the Child Lock is activated. 4. Close the door to begin the cycle. Digital Display The Digital Display on the control panel shows the ESTIMATED cycle time. When the dishwasher is powered up, the display will be blank. When the cycle and options are selected, the display will show the total estimated time to complete those selections. During operation, the display shows the remaining estimated operating time. • The estimated time shown in the display does not in- clude delay times for heating water, etc. • If Delay Start is selected, the display shows the delay time in hours. • Time may vary depending on the soil level of your load. NOTE POWER • Press the POWER button to turn on the control panel. If no cycle is selected within four minutes, the dishwasher will power off. • After the cycle is complete, the power automatically turns off for purposes of safety and economy. • If there is a power surge, power outage, or disruption of any kind, the PF indicator will display and power will be automatically turned off for safety. The cycle will need to be restarted. Smart Diagnosis Should you experience any problems with your dishwasher, it has the capability of transmitting data to your Smart Phone using the LG Smart Laundry & DW Application or via your telephone to the LG call center.

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LG LDF7774ST LDF7774BB LDF7774WW Dishwasher Service Manual and Repair Guide

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