LG LDF7551ST Service Manual & Repair Guide

DISHWASHER SERVICE MANUAL BEFORE SERVICING THE UNIT, PLEASE READ THIS MANUAL CAREFULLY FOR SAFETY AND CORRECT SERVICES. NOTE MODEL : LDF8574(WW,BB,ST) LDF8072(WW,BB,ST) LDF7561(WW,BB,ST) LDF7551(WW,BB,ST)

1. CAUTION ......................................................................................................................... 4 2. SPECIFICATIONS ........................................................................................................... 5 3. WIRING DIAGRAM ........................................................................................................ 6 4. FEATURES & TECHNICAL EXPLANATION ................................................................... 7 5. PARTS NAME ................................................................................................................ 13 6. PROGRAM CHART ..................................................................................................... 14 7. HOW TO DISASSEMBLE ............................................................................................ 16 8. TROUBLE SHOOTING METHODS .............................................................................. 24 A. TROUBLE SHOOTING ACCORDING TO DISPLAYED ERROR MESSAGE ...........24 B. STEAM GENERATOR ERROR MESSAGE ............................................................ 26 C. TROUBLE DIAGNOSES AND REPAIR BY SYMPTOM .......................................... 27 9. INSTALLATION INSTRUCTION ................................................................................... 31 10. EXPLODED VIEW .......................................................................................................38 CONTENTS - 3 -

- 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 !

2. SPECIFICATION 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) 114lbs Door Color White, Black, Stainless Tub Material Stainless Steel Control Electronic Rated Power(Watt) 1,350 Heater Power(Watt) 1,200 Programs 6 Upper Rack Position Adjustable Lower Rack 100 % Fold down Water Consumption 6.5 – 20.5 (Normal) Power Consumption(kWh/year) 245 (Normal) 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 - 5 -

3. WIRING DIAGRAM - 6 - X1 X2 NO COM NO COM NO COM NO COM NO COM NO COM X3 NA8 YL3 1 1 2 2 3 3 1 1 2 2 3 3 4 4 WH4 1 2 3 4 BL4 1 2 3 4 1 1 2 2 3 3 4 4 YL4 RD3 1 1 2 2 3 3 BL6 1 1 2 2 3 3 4 4 5 6 5 6 RD6 1 1 2 2 3 3 4 4 5 6 5 6 1 2 Rinse Refill 2 1 1 2 3 Turbidity Sensor 1 1 2 2 3 3 4 4 5 6 5 6 7 8 7 8 3 2 1 Flow Meter 2 1 Thermistor (Steam) Vairo S/W Float S/W Main PCB BLDC Drain Motor U W V 1 2 3 1 2 Dispen -ser 1 2 1 2 Inlet V/V (Sump) Inlet V/V (Steam) 4 5 7 6 Wash Motor 1 2 3 U V W Ha Hb Vcc GND Door S/W (2/2) COM NC NO Fan Motor Vario Motor 1 2 Steam Water Level (Low) Steam Water Level (High) 1 2 1 Door S/W (1/2) COM NC NO Sump Heater Steam Heater Pressure SW Pressure SW 3 2 1 3 2 1 L N Fuse Thermistor (Sump) VT BL BL BK WH BN RD SB YL YL BL RD BK WH BK GY BK WH BK WH BL BN BN BL YL RD RD YL BN BK BK BK BK GY YL BL OR RD BL RD BK GY VT BL BL SB WH SB WH RD RD BN BN VT YL/ GN BL RD RD RD RD YL GY RD GY YL RD RD U V W SB BL WH BK

4. FEATURES & TECHNICAL EXPLANATION 4-1. 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 ac- commodate large dishes. Extra large items (max. 14 in.) may be loaded in the lower rack by raising the upper rack. SLIM DIRECT MOTOR™ The new Slim Direct Mo- tor™ is inverter-controlled. Wash power is controlled based on cycle selection. - ergy use. HYBRID DRYING SYSTEM 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- 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 con- centrates all the cleaning power of the motor on each rack in turn. BLUE LCD (not on all models) AND LIGHT TOUCH BUTTONS The light touch buttons on the control panel make selections easy and convenient. The blue LCD display clearly displays the selected cycle and options. - 7 -

4-2. Display Panel CONTROL PANEL (steam models) C ycles Select your desired cycle. STEAM POWER This cycle is for heavily and hard soiled dishes. Steam Power defaults to the highest spray intensity and uses the power of steam to wash heavily soiled dishes. STEAM DUAL 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 perfor- other combinations are desired, use the steps listed below to change the intensities or to use the HALF LOAD feature. How To Use Steam Dual: 1. Select Steam Dual. 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. STEAM DELICATE This cycle adds the gentle power of steam to boost the cleaning power of the delicate cycle. The cycle is intended for ef- - ware. 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. QUICK This is a shortened cycle that is intended to wash recently used or lightly soiled loads, without drying. CHIME ON/OFF Press and hold the Quick and Steam Delicate buttons simul- taneously for approximately three seconds. TO CANCEL A CYCLE To cancel a cycle, open the door and then press and hold the Steam Delicate and Normal 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 If power is turned on and no cycle has been selected, the 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 30 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. The RINSE AID symbol indicates that the rinse aid NOTE SANITARY ( ) This high-temperature rinse sanitizes dishes and glassware in accordance with NSF/ANSI Standard 184 for residential dish- 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 LDF8574/ LDF8072 - 8 -

4-2. Display Panel CONTROL PANEL (non-steam models) Cycles Select your desired cycle. POWER SCRUB This cycle is for heavily and hard soiled dishes. DUAL WASH 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 perfor- other combinations are desired, use the steps listed below to change the intensities or to use the HALF LOAD feature. How To Use Dual Wash: 1. Select Dual Wash. 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. DELICATE 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. QUICK This is a shortened cycle that is intended to wash recently used or lightly soiled loads, without drying. CHIME ON/OFF Press and hold the Quick and Steam Delicate buttons simul- taneously for approximately three seconds. TO CANCEL A CYCLE To cancel a cycle, open the door and then press and hold the Steam Delicate and Normal 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 If power is turned on and no cycle has been selected, the LDF7561/ LDF7551 - 9 -

- - - - - - - CONTROL PANEL spotting on dishes. To add an extra rinse, press the Rinse but ton repeatedly until the Extra Rinse symbol appears in the display. RINSE ONLY 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 pre vent 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. SPRAY (INTENSITY) First, select the desired cycle. Press the Spray button repeat edly 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 be tween upper rack only and lower rack only. DELAY START The Delay Start feature allows you to delay the start of a se lected 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 be ing 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 sec onds. 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 re- maining estimated operating time. • The estimated time shown in the display does not include delay times for heating water, etc. • If Delay Wash is selected, the display shows the delay time in hours. • Time may vary depending on the soil level of your load. NOTE ECO The ECO option saves energy by using less water. This option should only be used with light to medium soiled dishes. POWER Press the Power button to turn on the control panel. If no cycle is selected within four minutes, the dishwasher will After the cycle is complete, the power automatically turns If there is a power surge, power outage, or disruption of any kind, the PF indicator will display and power will be au- 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 you tele- phone 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 (LDF8574/LDF8072/LDF7561,LDF7551) LDF8574/ LDF8072/LDF7561/LDF7551 - 10 -

LG LDF7551ST Service Manual & Repair Guide

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