Page 1 LG TRAINING MANUAL LG TRAINING MANUAL Fall 2013 Appliance Training LFX31995ST French Door Refigerator w/Smart ThinQ™...
Page 2 SMART THINQ REFRIGERATOR TRAINING MANUAL LFX31995ST FRENCH DOOR REFRIGERATOR LG Electronics Training Center, LGEAI, U.S.A.
Page 3 Contact Information LFX31995ST Refrigerator Technical Training Manager: John Ferguson john.ferguson@lge.com Training Center Manager: Joseph Stuart joseph.stuart@lge.com Technical Knowledgebase Website http://www.lgtechassist.com Global Service Front System (GSFS) Website http://gsfs-america.lge.com Product Information Website http://www.lg.com LG Learning Center http://www.lglearn.com...
Page 4: Specifications
Specifications LFX31995ST Refrigerator Specifications/ Page 3 Service Manual...
Page 5 Specifications LFX31995ST Refrigerator Specifications/ Page 3 Service Manual...
Page 6: Parts Identification
Parts Identification LFX31995ST Refrigerator Parts Identification/ Page 4 Service Manual...
Page 7: Warranty Statement
Warranty Statement LG Electronics Training Center, LGEAI, U.S.A.
Page 8 LG Limited Warranty Statement LFX31995ST Refrigerator LG Warranty Period 1 Year Coverage – Internal / Functional Parts & Labor 7 Year Sealed System. Parts only. Ten Years Linear Compressor. Part only. See page 115 in the owners manual for complete warranty statement.
Page 9 LG Limited Warranty Statement / Exclusions LFX31995ST Refrigerator LG Warranty Does Not Cover Items Listed Highlights Instruct customer Damage due to a corrosive atmosphere. Acts of God Misuse or abuse Repairs when product is used in other than normal and household use.
Page 10 LG Limited Warranty Statement / Exclusions LFX31995ST Refrigerator LG Warranty Does Not Cover Items Listed Highlights Cosmetic or missing parts to a display or refurbished product. Replacement of light bulbs or filters. Removal from the home for repairs. Removal or...
Page 11 LG SmartThinQ™Technology LG Electronics Training Center, LGEAI, U.S.A.
Page 12 Smart ThinQ™Technology Overview Smart ThinQ Appliances...
Page 13 Smart ThinQ™Technology Overview Overview Internet access via home Wi-Fi Network Product Registration Connectivity via Smart Phone or Tablet PC Diagnostics Download Custom Programs Software Program Updates Food Management – Smart Refrigerators Smart Grid Technology – Lower energy costs to operate appliances when utility costs are lowest.
Page 14 Smart ThinQ™Technology Member Registration User’s Guide Logo Member Registration Steps Access the LG smart ThinQ website (http://us.smartthinQ.com After Clicking the Sign Up Button, agree to the terms of use & privacy statements by clicking “Confirm” on each. Don’t forget the ID/Password entered. These will be used at the Product Registration for each Smart ThinQ appliance.
Page 15 53 Recipes 81 REF Information 54 Recipe Search 82 Smart Diagnosis 55 Food In Refrigerator 83 Wi-Fi 56 LG Smart Range Recipes 85 Date & Time 57 Grocery List 86 Brightness 57 Add New Food 86 Volume 59 Add Groceries using Keyboard...
Page 16 Smart Refrigerator Phone App LG Electronics Training Center, LGEAI, U.S.A.
Page 17 Downloading the Smart Phone Application Enable Wi-Fi on your phone. Search and download the “LG Smart Refrigerator” app from the Play Store with your smart phone. After the down load is complete, install the application Open App Enter your Smart ThinQ user ID and password.
Page 18 Smart Diagnosis allows both Wi-Fi and audible diagnosing with the smart phone. Smart Refrigerator app Synchronizing LG Smart Refrigerator app to Smart Refrigerator Synchronizing is an automatic feature of the app. After logging in a prompt different than what is viewed to the left will briefly appear to confirm you are connected to Smart Refrigerator.
Page 19 LG Smart Refrigerator App LFX31995ST Refrigerator Ref Manager App Allows monitoring of refrigerator settings only. Adjustments can not be done from phone. Multiple Smart Refrigerator apps can be registered to same product this can create temperature issues. Monitoring of Refrigerator/Freezer temperature, Fresh Air Filter, Water Filter, Ice Plus, Eco Friendly and Smart Saving (Zigbee).
Page 20 Smart Refrigerator app – Photo Transfer LFX31995ST Refrigerator Uploading Pictures to the refrigerator from an Sending Photos to SD card or Smart Phone. refrigerator. Pictures can be imported up to 300MB to the Photo Album. Imported pictures size is automatically converted to the display resolution.
Page 21 Control Panel, Display Panel and Functions LG Electronics Training Center, LGEAI, U.S.A.
Page 22: Smart Refrigerator Display Screen
Smart Refrigerator Display Screen LFX31995ST Refrigerator Home Screen Displays Widgets, Function Icons, Date/Time, Wi-Fi, Energy Saver, & Zigbee Edit Home Screen, Touch Settings Icon, scroll down to Edit Homescreen. Refer to pg 89 in Owners Manual for details. Note. Touch Screen will only respond to the human touch.
Page 23 Smart Refrigerator - Using the Widgets LFX31995ST Refrigerator A Widget is a mini application that can be accessed without using a web browser. There are nine widgets on seven screens that are loaded into the display: REF Manager, Smart Saving, Weather, Freshness Tracker, Daily Water, Photo Album, Recipes, Memo and Calendar.
Page 24 Smart Refrigerator - Using the Widgets LFX31995ST Refrigerator Daily Water widget 6 users can register and track their daily water usage. Pg 96 Owners Manual Daily Water widget Photo widget The selected Homescreen photo will appear on the display. Pg 72 thru 76 Owners Manual...
Page 25 Smart Refrigerator - Using the Widgets LFX31995ST Refrigerator Memo widget (Voice, Text, and Drawing) Displays the memo posted to Home page. Pg 63 to 67 Owners Manual Calendar widget Displays the calendar and weekly events. Pg 69 Owners Manual Memo/Calendar widget Setting the Weather widget Touch the Weather widget on the home screen.
Page 26 Smart Refrigerator Display Screen LFX31995ST Refrigerator Basic Buttons When a function icon is touched, the basic buttons will display on the top left. Home Button Touch the Home button to return to the Home screen. Back Button Touch the Back button to return to the previous screen.
Page 27 Smart Refrigerator Display Screen LFX31995ST Refrigerator Touch the Settings button to view or modify the display Settings. Drag your finger on screen to scroll. REF Information, Smart Diagnostics, Wi-Fi, Date & Time, Brightness, Volume, Zigbee, Update, Edit Homescreen, Screen Saver, Freshness Tracker Alert, Log In, Factory Reset .
Page 28 Smart Refrigerator Display Screen LFX31995ST Refrigerator Connecting Wireless Internet Touch Wi-Fi button from Settings screen. Touch the ON button Select your Network from list. Enter Password for network if required Touch Connect button to complete Wi-Fi set up. Connecting Wi-Fi/ Page 83 Owner’s Manual Note.
Page 29 Smart Refrigerator Display Screen LFX31995ST Refrigerator Entering Wireless Password Touch the Password box Keypad will display. Enter Wireless Network Password Touch the Done button. Shift for lowercase or capitol letters. Space button Delete button Alphabet/Number and special character button. Role of exchanging English &...
Page 30 Smart Refrigerator Display Screen LFX31995ST Refrigerator Log In to Register Smart ThinQ Refrigerator 1. Touch Log In button from Settings screen. 2. Touch the User ID button. Key pad will display. Enter User ID “e-mail address”. 3. Touch the Done button.
Page 31: Demo Mode
Touch ON press and hold Enable for 5 seconds, to turn on Demo Mode. Touch the OFF button to turn Demo Mode off. See next page if Demo Mode is not listed on Settings screen. Demo Mode/ Page 91 Owners Manual/LG Knowledge Base...
Page 32 Smart Refrigerator Display Screen LFX31995ST Refrigerator Press and Hold Tap 4 or 5 times Demo Mode Open Right Hand Door. Press and hold Top Left Corner of LCD screen. Touch Right Hand Corner of LCD screen 4 or 5 times.
Page 33 Smart Refrigerator Display Screen LFX31995ST Refrigerator Date & Time Select your time zone Touch the Date & Time Button from the Settings screen. Touch the Set Time Zone button. Scroll up and down and touch the desired time zone. To Manually Set the Date & Time Touch the Manual Setting circle.
Page 34 Moving slide bar all the way to left to mute volume. Zigbee The utility companies with smart meters do not have plans to communicate with LG Smart appliances at this time. See Owners Manual page 87 for future reference. Brightness, Volume, Zigbee / Pg 86, 87 Owners Manual...
Page 35 Smart Refrigerator Display Screen LFX31995ST Refrigerator Firmware Update Screen Once registration is complete, touch the Update button from the Settings screen. Firmware and Recipes automatically update through the network. This can be checked weekly/monthly. Touch the Network button below Firmware if “There are New Updates”...
Page 36 Smart Refrigerator Display Screen LFX31995ST Refrigerator Recipe Update Screen. Recipe updates are updated from the Food Channel. This can be checked daily. Follow instructions from previous page. Touch the Network button below Recipes if “There are New Updates” appears in the display.
Page 37 Smart Refrigerator Display Screen LFX31995ST Refrigerator Edit Home Screen Widgets can be added or removed from the Home screen. Touch the widgets to add or remove the check mark. No check mark will remove widget from Home screen. Drag and Drop a Widget to change order...
Page 38 Smart Refrigerator Display Screen LFX31995ST Refrigerator Factory Reset The Factory Reset erases all customers settings linked to the registered account. Data stored in the Food Manager, Favorite Recipes, Grocery, Memo, Calendar, Photo Album and User Log In will be deleted Customer can backup grocery list on phone.
Page 39: Control Panel
Control Panel LFX31995ST Refrigerator Refrigerator Temperature Touch REF Manager icon at bottom of Home screen. Touch the up or down button to adjust temp. Indicates set temperature not actual temp. To change the temperature mode touch the desired type. “ °C or °F”...
Page 40 Smart Saving – Delay Defrost Capability LFX31995 Refrigerator Delay Defrost Capability Allows User to Delay a Defrost cycle during Peak usage hours by Pressing the ON pad. 4 Hour AM & PM Windows allow the user to shorten or Override the Delay Time.
Page 41 Smart Saving – Delay Defrost Capability LFX31995 Refrigerator Delay Defrost Capability Use (+) or (-) change the 4 hour window(s). Remember: Changes can only occur within the programmed 4 hour windows. To Override a Delay Defrost Event: Set Start Time & End Time to same time.
Page 42 Control Panel – Food Manager LFX31995ST Refrigerator Food Manager Touch Food Manager at bottom of Home screen. In Food Manager, you can search for food items with the Add New Food button or magnifying glass to search using the key board.
Page 43 Control Panel – Food Manager LFX31995ST Refrigerator Modifying Food Information Food stored in the refrigerator, detailed information can be entered such as quantity and expiration date. Touch the Food Manager on the Home screen. Touch the food item or select all.
Page 44 Control Panel – FRESHNESS Tracker LFX31995ST Refrigerator Freshness Tracker - Widget Shows the food items that have passed or are approaching their expiration date. Freshness Tracker Alert can be turned on from Settings icon. Scroll the Home screen to locate (right or left) FRESHNESS Tracker.
Page 45 Control Panel – FRESHNESS Tracker LFX31995ST Refrigerator Turn ON Freshness Tracker Alert Touch Settings icon at bottom of Home screen. Scroll down list touch Freshness Tracker Alert, screen will change. Touch ON to activate. Touch Change Time to set time.
Page 46 Recipe /Owners Manual pg 53 Course, Total time, Ingredients, or Cuisine. LG Smart Range Recipes Displays recipes for food that are able to be made in the LG oven. Food in Refrigerator Refrigerator will recommend recipes using items listed in Refrigerator Manager.
Page 47 Control Panel - Recipes LFX31995ST Refrigerator Using Recipe Search 1. Select the desired search method (Course). 2. After selecting the preferred search method, a new screen will appear on the left side with a list of categories. Select the desired category.
Page 48 Scroll through and select the recipe to display. Touch the OK button to close the recipe screen or touch the Add to Favorites button to add the recipe into the Favorites section in the LG Smart Range Recipe screen. Recommended Recipes/Owners Manual 55...
Page 49 4. Scroll up and down the recipe list. Select a recipe by touch, the recipe will appear. 5. Touch the Send to LG Oven button, the recipe will be sent to the oven. Recipes for Total Time, Ingredients, and Cuisine can be viewed in the same manner.
Page 50 START button to begin cooking. User can monitor Range Progress and Prompts using the LG Smart Range Application on Recipe Received / Notifying User to Press START their Smart Phone. Note Range will Prompt User To begin preheating, press...
Page 51 Control Panel - Grocery LFX31995ST Refrigerator Add New Food to Grocery List Touch the Add New Food button. Search for food in the Category or Recommended tabs. Make sure that the box in the upper right corner of each selection is checked.
Page 52 Touch the Send to Phone button. When the transmission is complete, the transmission success message will display. Synchronizing LG Refrigerator app. Log in, enter Food Manager or Grocery, press option key, then Load from Refrigerator menu will display, touch OK.
Page 53 Control Panel – Smart Diagnosis LFX31995ST Refrigerator Audible Diagnosis (through call center) call 1-800-243-0000 wait till instructed. Touch Settings icon at bottom of Home screen. Touch Smart Diagnosis, screen will change. Touch Audible Diagnosis. Open the right refrigerator door. Hold mouthpiece in front of speaker.
Page 54 Control Panel – Smart Diagnosis LFX31995ST Refrigerator Self Diagnosis using Smart Phone (Wi-Fi) Login to Smart Refrigerator app. Touch Smart Diagnosis, menu. Touch Wi-Fi Diagnosis. Diagnosis will be displayed on the Smart Phone screen. Wi-Fi Diagnosis/Owners Manual 104 Self Diagnosis using Smart Phone (Audible) Touch Audible Diagnosis on phone.
Page 55 WI-FI Troubleshooting LG Electronics Training Center, LGEAI, U.S.A.
Page 56 Diagnosing Wi-Fi Connectivity LFX31995ST Refrigerator Verifying Wi-Fi Connectivity - Basics Check signal strength indicator on Home Screen. Touch Settings than REF Information. Wi-Fi Disconnected or Connected? Touch Wi-Fi, what is network status? Is Wi-Fi turned on? Login box displayed, requires logging back into network.
Page 57 Wifi Analyzer App for Android Phones LFX31995ST Refrigerator WiFi Analyzer / See “Google Play Store” Download app to your Phone Tap the Blue Apps Tab on phones’ Home Screen Tap the WiFi Analyzer Icon to Load (shown to the left).
Page 58 Wifi Analyzer App for Android Phones LFX31995ST Refrigerator WiFi Analyzer / Signal Strength Screen The Signal Strength Screen is shown Note the WiFi Channels on bottom of screen 1-14 Note the Channels selected by the user for their router(s) represented by the arch(s) above the channel numbers.
Page 59 Service Access / Tear Down LG Electronics Training Center, LGEAI, U.S.A.
Page 60 Refrigerator Door Removal LFX31995ST Refrigerator Removing Refrigerator Doors Remove hinge cover screws. Lift off hinge covers. Unplug all connectors and ground screws. At rear of refrigerator disconnect water line as in Figure1. Pull water line thru cabinet. Rotate latches as indicated by arrows in Figure 2 &...
Page 61 Freezer Door Removal LFX31995ST Refrigerator Removing Freezer Door Open door and remove food basket On both sides remove screws as indicated by circle. Lift front of door to remove hook from slide as indicated by square. Freezer door removal Freezer door removal...
Page 62 Freezer Evaporator Cover Removal LFX31995ST Refrigerator Removing Evaporator Cover Optional: Remove rails from one side. Pull on upper R.H. corner of evaporator cover and pull out far enough to unplug the connectors. Remove evaporator cover. Side rail Evaporator cover...
Page 63 Multi-Duct Removal LFX31995ST Refrigerator Removing Multi- Duct Remove all shelves and pantry. Remove the 2 circled covers. Remove screws behind covers. Pull Multi-duct from the top far enough to disconnect the connectors. Remove multi-duct. Multi-duct...
Page 64 Display Panel Removal LFX31995ST Refrigerator Removing LCD Display Pull from bottom of Display at the 2 circles to release tabs. Pull out & disconnect connectors & remove. Removing Dispenser Cover Remove the 2 screws at the circles. Pull from left bottom of cover.
Page 65 Ice Maker Assembly Removal LFX31995ST Refrigerator Removing Ice Maker Assembly Remove the screws in the circles. Pull from the bottom far enough to access connector. Unplug connector and remove the assembly. Removing Ice Maker Remove the screws in the squares.
Page 66: Troubleshooting
Troubleshooting Test Mode Failure Codes – F Codes LG Electronics Training Center, LGEAI, U.S.A.
Page 67 Test Mode LFX31995ST Refrigerator Test Mode Button Press button to advance Test Mode. Each Test Mode step times out at 5 min. Can not enter Test Mode with an Error Code present. Error Codes do not display for 3 hours after failure.
Page 68: Test Mode
Test Mode LFX31995ST Refrigerator Test Mode 1 All fans run. Pantry damper open. 3 Way valve open to both evaporators. Compressor runs. Test Mode 2 All fans run. Pantry damper closed. 3 Way valve open to both evaporators. Compressor runs.
Page 69 Smart Refrigerator Display Screen LFX31995ST Refrigerator Error Codes Retrieval Touch upper Right corner of LCD screen 3 Times. Error Code displays “ER CF”. If no Error “LQC Mode” displays. After 3 hours Error Code will display without above procedure. Repeat to see if multiple error codes are in memory.
Page 70 Error Codes LFX31995ST Refrigerator Error Codes Display 3 hours after the error Er SS, Er rt, Er It, & Er gf do not auto display Use Error Codes Retrieval to check for these 4 codes. Error Code/ Page 21 Service Manual...
Page 71 Error Codes LFX31995ST Refrigerator Error Codes Display 3 hours after the error Er It, Er gf, Er SS & Er rt do not auto display Use Error Codes Retrieval to check for these 4 codes. Error Code/ Page 22 Service Manual...
Page 72 Display & LCD PWB Assembly LG Electronics Training Center, LGEAI, U.S.A.
Page 73 Display & LCD PWB Assembly LFX31995 Refrigerator Display & LCD PWB Assembly Comprises 2 Boards Each board has separate Supply LCD Board uses ON/OFF Switch to make / break 12V LCD Display Home Screen / Front View...
Page 74 Display & LCD PWB Assembly LFX31995 Refrigerator Display & LCD PWB Assembly Rear View Two Boards Display PWB LCD PWB LCD Display Home Screen / Rear View...
Page 75 Display PWB Assembly LFX31995 Refrigerator Display PWB Assembly Display PWB Assembly CON1 -12V Input Main PWB. w / Connectors 1, 2, 4 & 5 are used RX & TX to Main PWB & 12V Connectors 3 & 6 not used!! Water Pipe Heater Reference Wiring Diagram CON2 -12V...
Page 76 Display PWB Assembly / Diagram LFX31995 Refrigerator Display PWB / Wiring Diagram...
Page 77 LCD PWB Assembly LFX31995 Refrigerator LCD PWB Assembly LCD PWB Assembly CON1 –RX & TX Display PWB & Connectors 1, 2, 3, 8, 11, P1, & Speaker J1 are used CON2 & 3 –Microphones (MIC) Connector 10 not used!! CON8 – 5V Output to Zigbee Reference Wiring Diagram CON11 –...
Page 78 LCD PWB Assembly / Diagram LFX31995 Refrigerator LCD PWB / Wiring Diagram...
Page 79 Electrical Dispenser PWB Assembly LG Electronics Training Center, LGEAI, U.S.A.
Page 80 Dispenser PWB Assembly LFX31995 Refrigerator Dispenser PWB Assembly 2 Connectors Connector 1 – 5V & 12V Connector 2 – 120VAC / Auger Motor, IM Water Fill & Water CON2 Dispenser Valves 4 Relays: Crush, Cube, Water Dispenser Valve (Left Door) & Pilot Water Valve (Ref.
Page 81 Dispenser PWB Assembly Diagram LFX31995 Refrigerator Dispenser PWB Assy. Diagram Connector 1 – 5V & 12V Connector 2 – 120VAC / Auger Motor, IM Water Fill & Water Dispenser Valves 4 Relays: Crush, Cube, Water Dispenser Valve (Left Door) & Pilot Water Valve (Ref.
Page 82 Dispenser PWB Assembly / CON1 LFX31995 Refrigerator CON1 Dispenser PWB Pin 1 – 12VDC Input Pin 2 – 5 VDC Input Pin 3 – Ground Reference Pin 4 – 5VDC Input / RY 1 CW Crush Ice Pin 5 – 5VDC Input / RY 2 CCW Cube Ice Pin 6 –...
Page 83 Dispenser PWB Assembly / CON 2 LFX31995 Refrigerator CON2 Dispenser PWB Pin 1 – Not Used Pin 2 – Neutral Input Pin 3 – Neutral Output to Auger Motor Pin 1 Pin 4 – Output to Auger Motor Pin 2 Pin 5 –...
Page 84 Electrical Critical Voltage Test Points 120V Input – Power & Monitor Outputs – Power & Control Outputs “Appliances live by these Critical Voltages!” LG Electronics Training Center, LGEAI, U.S.A.
Page 85 Main PWB Assembly LFX31995 Refrigerator Main PWB Assembly Mounted on back panel of refrigerator; under an aluminum cover on the left hand side. Comprises 9 Connectors Input of 120VAC line voltage Provides the Power Supply for 5VDC & 12VDC Outputs for refrigerator electronics Controls: Compressor, Defrost Circuits, Heaters, Fan Motors, 3-...
Page 86 Main PWB Assembly / Critical Voltage Test LFX31995 Refrigerator CON1 Line Voltage Input L1 – BK L1 wire N – White Neutral Wire BK to WH – 120V Input from Home Electrical GN/YL – Chassis Ground (Drain) – Essential for Electronic Control Boards / Safety &...
Page 87 Main PWB Assembly / Critical Voltage Tests LFX31995 Refrigerator CON6 Wiring Diagram / Main PWB Easy Test Points for 5VDC & 12VDC Output / Main PWB CON6 CON6 & 12V Outputs from Regulators Available 24/7 Multiple 5 & 12V test points / These shown are in close proximity.
Page 88 Left Door Hinge Connector / Critical Voltage Tests LFX31995 Refrigerator Large Connector Left Door Hinge / PK (L1) & BL (N) Left Hand Door Connectors / L1, 5V & 12V Left Door Connectors 6 Pin Large Connector / 120VAC PK to BL 18 Pin Connector / YL 5VDC &...
Page 89 Left Door Hinge Connector / Critical Voltage Tests LFX31995 Refrigerator Left Hand Door Connectors / L1, 5V & 12V Left Door Connectors No 120V PK to BL Large Connector – No power to refrigerator or open 10A Fuse on Main PWB – See CON1 Main PWB this section.
Page 90: Power Meter
Power Meter Zigbee Module LG Electronics Training Center, LGEAI, U.S.A.
Page 91 Power Meter / Location - Ref. Top between Hinge Covers Power Meter / Diagram / Main PWB Power Meter Monitors Power Usage in the refrigerator, but is not currently used! No utility companies in the US are currently integrating with LG appliances.
Page 92 Assembly CON8 / LCD ON OFF Switch Zigbee Module Board Zigbee module plugs into a USB port Operates on 5V Currently the Zigbee module is unavailable to the end user customer! No utility companies in the US are currently integrating with LG appliances...
Page 93 Electrical Wiring Diagram Strip Circuits LG Electronics Training Center, LGEAI, U.S.A.
Page 94: Temperature Sensors
Temperature Sensors LFX31995ST Refrigerator Pantry Sensor in multi duct Refrigerator Defrost Sensor Ice Room Sensor above icemaker Freezer Sensor on Evaporator Cover Room Temperature Sensor under R.H. hinge cover Freezer Defrost Sensors (2) Refrigerator Sensor in refrigerator light...
Page 95 Sensors LFX31995ST Refrigerator Temperature Sensors Refrigerator sensor is located on the Main LED light assembly at the upper center of the refrigerator ceiling. The sensor is provided with 5Vdc from the Main Power control Board (PCB) at Con 7 between WH & WH.
Page 96 Sensors LFX31995ST Refrigerator Temperature Sensors The Ice room sensor is located above the icemaker in the ice room. The sensor is provided with 5Vdc from the main PCB at Con 5 BL to BL with a return voltage of 2.68Vdc at 0°.
Page 97 Sensors LFX31995ST Refrigerator Temperature Sensors Freezer defrost sensors (2) are located on the freezer evaporator, one on the upper right side the other on the left side on the rear of the evaporator 5 inches down. The sensors are provided with 5Vdc from the Main Power Control Board (PCB) at Con 7 between YL and BR and BOW with BN being Gnd.
Page 98 Sensors LFX31995ST Refrigerator Con 5 Con 7...
Page 99 Sensor Chart LFX31995ST Refrigerator Sensor Test Example Ice Room sensor, BL to BL connector Plugged in, 2.56 VDC @ 5° F. Unplugged, 16.99k @ °5 F. Con 5 Main PCB Sensor Charts/ Page 49 & 50Service Manual...
Page 100 Sensor Chart LFX31995ST Refrigerator Sensor Test Example Ref Defrost Sensor, BO to BO, Plugged in 3.487 VDC @ 5° F. Unplugged 60.13 @ 5° F. CON 7 Sensor Charts/ Page 49 & 50Service Manual...
Page 101: Door Switches
Door Switches LFX31995ST Refrigerator R.H. Refrigerator Door Switch CON 5 L.H. Refrigerator Door Switch Freezer Door Switch...
Page 102 Door Switches LFX31995ST Refrigerator Door Switch Operation There are three door switches, each switch has two sets of contacts which are open with the doors open. On the refrigerator door switches the two Grey wires attach to the door Monitor Switches.
Page 103: Fan Motors
Fan Motors LFX31995ST Refrigerator Refrigerator Fan, in Multi Duct Condenser Fan Multi Duct with Filter & Refrigerator Fans Freezer Evaporator cover with Ice Room & Freezer fans...
Page 104 Fan Motors LFX31995ST Refrigerator Fan Motors Fan motors are variable speed DC motors with supply voltage ranging from 8Vdc to 15Vdc based on demand and temperatures. There are three wires to each motor except for the filter fan motor which has two.
Page 105 Fan Motors LFX31995ST Refrigerator Fan Motors Refrigerator fan motor is located in the Multi Duct mounted on the rear wall of the refrigerator compartment. The refrigerator fan motor is used to pull cold air from the refrigerator evaporator and distribute it thru the multi duct to the refrigerator compartment.
Page 106 Fan Motors LFX31995ST Refrigerator Fan Motors Ice room fan motor is located on the freezer evaporator cover and is used to provide freezer air to the ice room located in the L.H. refrigerator door. Internal to the cabinet there are supply and return ducts to provide air to the ice room.
Page 107 Fans & Damper Motors LFX31995ST Refrigerator Con 7 Con 6...
Page 108 Pantry Damper Motor LFX31995ST Refrigerator Exhaust of Damper to Pantry Exhaust of Damper to Pantry Connector for Damper Motor Con 6 Main PCB...
Page 109 Pantry Damper Motor LFX31995ST Refrigerator Pantry Damper Motor The Pantry Damper Motor is supplied with a pulsing DC voltage to open & close the Pantry Damper from Con 6 on the Main Power Control Board (PCB) between PK, BR, BO & WH.
Page 110 Dispenser Auger Motor LFX31995ST Refrigerator Dispenser Auger Motor ▫ Auger Motor receives 120Vac from the Dispenser Power Board thru the connector at the top of the AC assembly between WH, SB & BK from CON2. CON2 between GY & WH to capacitor mounted above Main PCB on rear of cabinet.
Page 111: Defrost Circuit
Defrost Circuit LFX31995ST Refrigerator Ref Evaporator, Heater 160 Watts Con 3 Main PCB Freezer Evaporator, Heater 300 Watts...
Page 112 Defrost Circuit LFX31995ST Refrigerator Defrost circuit The LFX31995ST being a dual evaporator refrigerator has two defrost heaters and two thermal fuses as safety devices along with three defrost sensors. The refrigerator heater is a 160 watt heater with a thermal fuse that opens @ 171°F.
Page 113 Pilot Valve & Flow Sensor LFX31995ST Refrigerator Con 3 Main PCB Pilot Valve & Flow Sensor Connector L.H. Door Hinge Connector L.H. Door Hinge Con 4 Display Board Con 3 Main PCB...
Page 114 Water System LFX31995ST Refrigerator Pilot valve Located at the rear of refrigerator where the household water valve connects. Receives 120Vac from CON3 on RD to BL. Filter Located in the upper L.H. corner of the refrigerator compartment all water passes thru the filter or the by-pass.
Page 115 Water & I/M Valve LFX31995ST Refrigerator Water & I/M Valve under Ice Room Con 2 Dispenser PWB Diagram Dispenser Power Board behind Dispenser...
Page 116 Refrigerator LED & Sensor LFX31995ST Refrigerator Ref Sensor Ref sensor WH to WH 2.4 VDC @ 40 degrees F. LED Light Power RD to BK 12VDC constant. BK GND Reference BL 12VDC Thru Door Switch LED & Sensor...
Page 117 Refrigerator LEDs LFX31995ST Refrigerator LEDs 12VDC Use care removing lenses. Ref Ceiling Filter L.H. Cabinet R.H. Cabinet Pantry Bottom Ref Door for Freezer...
Page 118 LED Circuits LFX31995ST Refrigerator Con 7 Main PCB Ref Ceiling LED Con 5...
Page 119 Three Way Valve LFX31995ST Refrigerator Three Way Valve Do not unplug at molded plug. Unplug at connector above water valve. Three Way Valve Three Way Valve connector...
Page 120: Three Way Valve
Three Way Valve LFX31995ST Refrigerator Con 6 Main PCB Three Way Valve...
Page 121 Three Way Valve LFX31995ST Refrigerator Three Way Valve The Three Way Valve is used to supply Freon to both refrigerator and freezer evaporators. The valve can send Freon to one at a time or both at the same time or to neither evaporator.
Page 122 Water Filter Water & Ice Dispenser LG Electronics Training Center, LGEAI, U.S.A.
Page 123 Water Filter & By-pass LFX31995ST Refrigerator Filter & By-pass By-pass installed from factory. Filter in L.H. door drawer. Fold down to remove by-pass. Install filter & fold up. For whole house filter or reverse osmosis system install by-pass. By-pass can be installed to diagnose low water flow.
Page 124 Water Dispenser LFX31995 Refrigerator Water Tank & Valves Located @ inside bottom of left door, behind plastic cover. Reservoir Tank capacity is approximately 16 oz. / 460ml. Dual Valve Assembly / Icemaker & Water Dispenser Dual Valve’s water path is in series Water Tank, Water Filter or By Pass &...
Page 125 Water Dispenser LFX31995 Refrigerator Water Valves Tube Colors Water Valves Wiring Colors Water Dispenser – WH Tube Water Dispenser – BL & PR Icemaker – OR Tube Icemaker – BL & OR Icemaker Water Dispenser IM & Water Dispenser Dual Valve...
Page 126 Water / Ice Dispenser LFX31995 Refrigerator Water Ice Selector Button & LEDs Allows user to select: Water, Cubed Ice or Crushed Ice by depressing the selector button. LED will illuminate under the selection. Selector operates on 5V signals the Display Board & Water Dispenser PWB Assemblies.
Page 127 Water / Ice Dispenser LFX31995 Refrigerator Water Ice Dispenser Paddle Behind the paddle is a N.O. switch that operates on 5V The switch is wired to CON4, pins 24 & 26 on the Display PWB Assy. When paddle is depressed, the switch closes.
Page 128: Water / Ice Dispenser
Water / Ice Dispenser LFX31995 Refrigerator BL – Neutral RD – L1 Dispenser PWB Assembly / RY3 & RY4 Water Valve Circuits...
Page 129 Water / Ice Dispenser LFX31995 Refrigerator Water Ice Dispenser Paddle Behind the paddle is a N.O. switch that operates on 5V The switch is wired to CON4, pins 24 & 26 on the Display PWB Assy. When paddle is depressed, the switch closes.
Page 130 Water / Ice Dispenser LFX31995 Refrigerator BL – Neutral RD – L1 Dispenser PWB Assembly / RY2 Cubed Ice / Auger Motor Turns CCW...
Page 131: Crushed Ice
Water / Ice Dispenser LFX31995 Refrigerator Water Ice Dispenser Paddle Behind the paddle is a N.O. switch that operates on 5V The switch is wired to CON4, pins 24 & 26 on the Display PWB Assy. When paddle is depressed, the switch closes.
Page 132 Water / Ice Dispenser LFX31995 Refrigerator BL – Neutral RD – L1 Dispenser PWB Assembly / RY1 Crushed Ice / Auger Motor Turns CW...
Page 133 Water / Ice Dispenser LFX31995 Refrigerator Ice Dispenser Cap Duct Motor When the paddle is depressed, the Display Board also sends 5V the Dispenser Board to energize the Cap Duct Motor The Display PWB signals the Dispenser PWB via CON4 Pin 20 to CON1 Pin 10 on the Dispenser PWB.
Page 134 Water / Ice Dispenser LFX31995 Refrigerator Dispenser PWB Assembly / CON 1 / Inputs from Display PWB CON4...
Page 135: Auger Motor Capacitor
Auger Motor Capacitor LFX31995 Refrigerator Auger Motor Capacitor Located on the rear cabinet of the refrigerator, above the Main PWB & behind the metal cover. The capacitor is rated 14µF (+10% / -5% tolerance) @ 240VAC The OR &GY wires are routed via the Upper Left Door Hinge from the auger motor in the left door to the capacitor.
Page 136 Twist Tray Icemaker LG Electronics Training Center, LGEAI, U.S.A.
Page 137 Ice Maker Testing LFX31995ST Refrigerator Ice Maker Test Ensure On/Off switch is ON. Press & hold Test Switch for 3 seconds. If the Ice Maker rotates and fills the Ice Maker is OK. If no action is observed check Ice Maker power at the connection above the Ice Maker.
Page 138 Ice Maker Testing LFX31995 Refrigerator Ice Bin Sensor Test Remove ice bin. Close refrigerator door. Open freezer door. Wait 3 minutes. Tap upper L.H. corner of LCD display screen 5 times. If Empty is displayed bin sensor is good. If Full is displayed bin sensor is faulty or ice bin sensors have frost on them and need cleaned.
Page 139 Ice Maker Assembly Removal LFX31995ST Refrigerator Removing Ice Maker Assembly Remove the screws in the circles. Pull from the bottom far enough to access connector. Unplug connector and remove the assembly. Removing Ice Maker Remove the screws in the squares.
Page 140 Ice Maker Facts LFX31995 Refrigerator Ice Maker Facts Freezer & Icing Room must be 0° to 5°F Icemaker harvests every 70 to 80 minutes and after Icemaker Tray Sensor reaches 16° to 18°F. Produces 70 to 210 cubes per 24 hours.
Page 141 Ice Maker Failure Codes LFX31995 Refrigerator Ice Maker Failure Code – ER it Motor Did not Run Press IM Test Button IF IM does not Run – Perform ER it input Voltage Test. (Previous page / this section) IF 12V present WH to PR –...
Page 142 Ice Maker Failure Codes LFX31995 Refrigerator Ice Maker Failure Code – ER gF Water Fill Not Sensed by Icemaker IF Icemaker Does Not Fill ER gF Test IM & Pilot Water Valves / Refer to Wiring Diagrams Run IM Test Mode – Check for 120V output from IM to IM &...
Page 143 Pilot Valve & Flow Meter LFX31995ST Refrigerator Display PWB CON4 Dispenser PWB Connector L.H. Door Hinge Pilot Valve & Flow Meter Con 3 Main PCB...
Page 144 Pilot Valve & Flow Meter LFX31995ST Refrigerator Pilot Valve & Flow Meter Circuit ▫ Flow Meter receives 5Vdc from CON4 on Display PWB M,O,U. ▫ Pilot Valve receives L1 from CON2 on Dispenser PWB Assembly. Main Power Control Board CON3...
Page 145 Linear Compressor Sealed System LG Electronics Training Center, LGEAI, U.S.A.
Page 146 Linear Compressor LFX31995 Refrigerator Installation Notice / Operational Noise / Notice Included with each Linear Refrigerator!! Installation Note: Make sure the refrigerator is installed according to installation instructions with the refrigerator supported by the front leveling legs!! Installation Notice / Leveling Legs...
Page 147: Linear Compressor
Linear Compressor LFX31995 Refrigerator Linear Compressor Label Linear Model Code / Serial Number...
Page 148 Linear Compressor LFX31995 Refrigerator FC75LBNA FC075LANA Linear Controller Types...
Page 149 Linear Compressor / Diagnostic LED LFX31995 Refrigerator LED Test Conditions IPM (Intelligent Power Module) monitors compressor running condition / On Main PWB Assy. IPM displays error code via LED flash(s) on the Main PWB. 1 Flash – Motor Current or Voltage Error 2 Flashes –...
Page 150 Linear Compressor / Diagnostic LED LFX31995 Refrigerator Diagnostic LED Use chart on previous page or refer to Service Manual, pages 66 through 69. Type A Inverter – Main PWB / Linear Diagnostic LED Diagnostic LED...
Page 151 Linear Compressor LFX31995 Refrigerator LFX31995 Type A Inverter Control System - Incorporated on Main PWB Linear Compressor FC075LANA LG Linear Compressor...
Page 152 Linear Compressor LFX31995 Refrigerator FC75LBNA /FC075LANA A-Inverter / E-Inverter / Single Winding Compressors...
Page 153 Linear Compressor LFX31995 Refrigerator Ohm Testing the Compressor...
Page 154: Three Way Valve
Three Way Valve LFX31995 Refrigerator Sealed System Sealed System...
Page 155 Three Way Valve LFX31995 Refrigerator There are 4 operating modes in 3way valve. 1. R-Room open 2. F-Room open 3. Both (F/R) Open 4. Pump Down (Both Close) R-Room Operation F-Room Operation Condenser Condenser Compressor Dryer Compressor Dryer R-Capillary R-Capillary Evaporator Evaporator 3 way Valve...
Page 156 Three Way Valve LFX31995 Refrigerator Both open Operation Pump Down Condenser Condenser Compressor Dryer Compressor Dryer R-Capillary R-Capillary Evaporator Evaporator 3 way Valve 3 way Valve Evaporator Evaporator Check Valve F-Capillary Check Valve F-Capillary Test Mode 1 Collect refrigerant due to pressure unbalance between R-Evaporator and F-Evaporator.
Page 157 Three Way Valve LFX31995ST Refrigerator Three Way Valve Do not unplug at molded plug. Unplug at connector above water valve. Three Way Valve Three Way Valve connector...
Page 158 Three Way Valve LFX31995ST Refrigerator Con 6 Main PCB Three Way Valve...
Page 159 Three Way Valve LFX31995ST Refrigerator Three Way Valve The Three Way Valve is used to supply Freon to both refrigerator and freezer evaporators. The valve can send Freon to one at a time or both at the same time or to neither evaporator.
Page 160: Freezer Evaporator
Evaporator Frost LFX31995ST Refrigerator Freezer Evaporator Frost 7 minutes from start up. Freezer Cap Tube Frost Refrigerator Evaporator Frost 7 minutes from start up. Ref Cap Tube Frost...
Page 161 Evaporator Frost LFX31995 Refrigerator Refrigerator Evaporator Frost pattern after 30 minutes. Door Open Both Evaporators active! Refrigerator Evaporator...
Page 162 Evaporator Frost LFX31995 Refrigerator Freezer Evaporator Frost pattern after 30 minutes. Door Open Both Evaporators active! Freezer Evaporator...
Page 163: Check Valve
Check Valve LFX31995 Refrigerator Check Valve Check Valve Location...
Page 164: Service Bulletins
Service Bulletins LG Electronics Training Center, LGEAI, U.S.A.
Page 174: Exploded View
Exploded View LG Electronics Training Center, LGEAI, U.S.A.
Page 175 Exploded View - Case LFX31995ST Refrigerator Case Parts/ Service Manual...
Page 176 Exploded View – Freezer Parts LFX31995ST Refrigerator Freezer Parts/ Service Manual...
Page 177 Exploded View – Refrigerator Parts LFX31995ST Refrigerator Refrigerator Parts/ Service Manual...
Page 178: Exploded View - Door Parts
Exploded View – Door Parts LFX31995ST Refrigerator Door Parts/ Service Manual...
Page 179 Exploded View – Dispenser Parts LFX31995ST Refrigerator Dispenser Parts/ Service Manual...
Page 180 Exploded View – Valve & Water Tube Parts LFX31995ST Refrigerator Valve & Water Tube Parts/ Service Manual...
Page 181 Exploded View – Icemaker & Ice Bin Parts LFX31995ST Refrigerator...
Page 182 Appendixes Temperature Conversion Ohms’ Law & Watts’ Law Wheel Hard to Find Part Numbers LG Electronics Training Center, LGEAI, U.S.A.
Page 183: Temperature Conversion
Temperature Conversion LRE3027ST Electric Range Conversion Formulas °F = °C x 1.8 + 32 °C = °F – 32 x 5/9 Temperature Conversion...
Page 184 Ohm’s Law & Watt’s Law Wheel LRE3027ST Electric Range Conversion Formulas I = E / R (Ohm’s Law) P = I x E (Watt’s Law) Take note & use the reciprocal formulas! Ohm’ s Law & Watt’s Law...
Page 185 Hard to Find Part Numbers LG Electronics Training Center, LGEAI, U.S.A.
Page 186 Hard to Find Part Numbers Rubber Leveling Leg Cups Rubber Cups for Leveling Legs on Front Load Washers or Pedestals (Order 4 when needed) 4620ER4002B is used on Tile Floors MJB41415401 is used on Wooden Floors It is recommended not to extend the leveling legs more than 10mm or .4”...
Page 187 Hard to Find Part Numbers Non Skid Pads Non Skid Pads for Washing Machines Part No. AGM73171801 Order a quantity of 2 when needed Part Number is listed in Parts Not Illustrated on Exploded View LOC No. is listed as G010 Place the pads under the front feet with adhesive side attached to floor.
Page 188 Hard to Find Part Numbers Appliance Touch Up Paints Touch Up Paint Part Numbers Available in 1/2 oz. Bottles...
Page 189 Hard to Find Part Numbers Front Load Washer Door Hinge Screws Hinge Screw Sizes Front Load Washer Door Hinge Screws M5 X 10mm .8 Pitch Refer to LGTechAssist.com or M4 X 8mm .7 Pitch GSFS for current service bulletins on hinge changes and available door hinge screws by part number.
Page 190 Hard to Find Part Numbers Laundry Parts Laundry Parts Square Gas Dryer Igniter Part No. MEQ61841001 Note: Round Igniters 5318EL3001A & B maybe substituted. Front Load Washer Door Hinge Shim (Holder) / Order Part No. MEG41552101. (Picture Unavailable) MEQ61841001 Square Igniter...
Page 191 Hard to Find Part Numbers Front Load Washer Mushroom Valves Water Inlet & Vent Mushroom Valves 4769ER4001A – Vent Valve 4769ER4002A – Water Inlet Valve Use these part numbers when valves are not shown on Parts Exploded Views. Tub Vent Mushroom Valve...
Page 192 Hard to Find Part Numbers Drain Hose Extension Kit / Front Load Washers Front Load Washers Drain Hose Extension Kit 5215ER2002K – 63” Hose with clamps & fitting 1600mm in length for metric users Drain Hose Extension Kit 63”...
Page 193 Hard to Find Part Numbers Pedestal Parts Pedestal Conversion Kits Kit parts allow older pedestals produced prior to August 2007 to be used with newer washers & dryers. Red & White are the only 2 colors available. AAA30793428 – White Brackets AAA30793429 –...
Page 194 Hard to Find Part Numbers Refrigerator Replacement UV Dye Driers UV Dye Drier Part Numbers ADH73150202 – Use on Single Evaporator Refrigerators Inlet Dia. P/no Type ADH73150201 – Use on Dual ID 2.2mm ADH73150202 1 Eva Evaporator Refrigerators ID 4.2mm ADH73150201 2 Eva UV Dye Drier...
Page 195 LG Service Tools Part Numbers LG Electronics Training Center, LGEAI, U.S.A.
Page 196 Hard to Find Part Numbers LG Laundry Service Tool Part Numbers Front Load Washer Service Tools 383EER4001A – Outer Gasket Clamp Pliers 383EER4004A – Inner Gasket Clamp Pliers 383EER4003A – Damper Pin Pliers 3W20018B – Shipping Bolts Removal & Leveling Tool (Packed with Washer)
Page 197 Hard to Find Part Numbers LG Laundry Service Tool Part Numbers Top Load Washer Service Tools (Basket Drive Nut Removal) Tools available through your local suppliers (Not available through LG) Amana 306P4 / 38mm opening KD3909 / 38mm Impact Socket (T-Bar Sold Separately!) 1.5”...
Page 198 Hard to Find Part Numbers Refrigerator Leveling & Door Adjustment Tool Refrigerator Service Tool MHU3821902 is available through LG Parts / GSFS MHU3821901 has been substituted with the number above. This service tool or substitution is packed with each new refrigerator.
Page 199 Hard to Find Part Numbers Test Lead Adapters VOM Test Lead Adapters Fluke TP88 Test Lead Adapter / 3 amp 60V Fluke TP920 Service Kit These items are available through your local supplier or an internet Fluke TP88 Test Lead Adapters supplier.
Page 200 Fall 2013 Appliance Training...

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