LG LFXS26596S Service Manual

The LG LFXS26596S is a 26 cubic foot French Door Refrigerator with InstaView Door-in-Door, Smart Cooling Plus system, Linear Compressor, Craft Ice maker, and SmartThinQ technology. This service manual provides detailed information for qualified technicians regarding specifications, disassembly, troubleshooting, wiring diagrams, and parts replacement. Below are key sections for safety, product overview, technical data, diagnostics, and repair procedures.

1. Product Overview & Features 2. Safety Precautions 3. Technical Specifications 4. Component Locations & Exploded Views 5. Disassembly & Reassembly Instructions 6. Electrical System & Wiring Diagrams 7. Refrigeration System 8. Control System & Diagnostics 9. Error Codes & Troubleshooting 10. Parts List & Ordering Information 11. Test Mode & Performance Verification

Product Overview & Features

Key components: French Doors with InstaView panel, Freezer Drawer, Linear Compressor, Dual Evaporators, Smart Cooling Plus system, Craft Ice Maker, Water & Ice Dispenser, SmartThinQ Connectivity.

Feature	Description
InstaView Door-in-Door	Knock twice on the glass panel to illuminate interior without opening door
Linear Compressor	Direct drive inverter compressor for efficiency and reduced noise
Smart Cooling Plus	Multi-air flow and humidity control system
Craft Ice Maker	Produces slow-melting spherical ice
SmartThinQ Technology	Wi-Fi enabled for remote monitoring and control via app
Door Cooling+	Dedicated vent for cooling in door compartments
Fresh Air Filter	Deodorizing filter for fresher food storage
Convertible Drawer	Adjustable temperature drawer (Pantry/Chill/Frozen)
Water & Ice Dispenser	External dispenser with filtered water and ice options
Interior Lighting	LED lighting in refrigerator and freezer compartments

Safety Precautions

Before servicing, read all safety warnings. Disconnect power before accessing electrical components.

Electrical Safety: Unplug unit or disconnect power at circuit breaker before servicing.
Refrigerant Safety: Follow EPA guidelines for handling R-600a (isobutane) refrigerant.
Component Handling: Allow capacitors to discharge. Use insulated tools.
Lifting & Moving: Unit is heavy; use proper lifting techniques or assistance.

WARNING! Risk of electric shock. Risk of fire from flammable refrigerant. Ensure work area is well-ventilated.

Technical Specifications

Model: LFXS26596S
Type: French Door Refrigerator with Freezer Drawer
Total Capacity: 26.0 cu. ft.
Refrigerant: R-600a (Isobutane)
Electrical: 115 VAC, 60 Hz
Amperage: 6.5 A (Running), 15 A (Max)
Dimensions (HxWxD): 69.875" x 35.75" x 33.875"
Water Filter: LT1000P (or compatible)
Linear Compressor Model: Specific to platform (refer to parts list)
Defrost System: Adaptive Defrost with Heater

Component Locations & Exploded Views

Main assemblies: Cabinet, Door Assembly, Refrigerator Compartment, Freezer Compartment, Machine Compartment.

Key Components: Main Control Board, User Interface Board, Inverter Board, Linear Compressor, Evaporator Fans, Condenser Fan, Damper Assembly, Ice Maker Assembly, Water Valve, Temperature Sensors.

Refer to exploded view diagrams for part numbers and relationships. Diagrams include: Door & Hinge Assembly, Refrigerator Interior Shelving & Bins, Freezer Basket Assembly, Machine Compartment Layout, Wiring Harness Routing.

Disassembly & Reassembly Instructions

General procedure: 1. Unplug refrigerator. 2. Remove external panels/grilles. 3. Access internal components. 4. Document wire connections. 5. Reverse for reassembly.

Door Removal: Remove hinge covers, disconnect wiring harness, support door, remove hinge bolts.
Interior Shelving/Bins: Lift and pull forward to remove.
Rear Panel Removal: Remove screws to access evaporator and fans.
Control Panel: Remove screws from inside door or top grille.
Machine Compartment: Remove rear grille, discharge capacitor.

Tip: Take photos during disassembly for reference. Keep screws organized.

Electrical System & Wiring Diagrams

Main Power enters through power cord to Main PCB. System uses multiple PCBs: Main Control, Inverter, UI, Relay.

Locate wiring diagram for specific model variant.
Check connectors for corrosion or loose pins.
Use multimeter to verify voltage at key test points.
Refer to schematic for wire colors and connector IDs (e.g., CN201, CN701).

WARNING! Always disconnect power before testing continuity or resistance.

Refrigeration System

Sealed system with Linear Compressor, Condenser, Dual Evaporators (Fridge/Freezer), Capillary Tubes, Filter-Drier.

Evacuation & Charging: Required for any sealed system repair. Use manifold gauges.
Leak Testing: Use electronic leak detector or nitrogen with soap solution.
Component Replacement: Compressor, evaporator, condenser, filter-drier.
Refrigerant Charge: R-600a, 2.5 oz (approx., verify with data plate).
Oil Charge: POE oil, specific amount per compressor model.

WARNING! R-600a is flammable. No sparks or open flames. Recover refrigerant properly.

Control System & Diagnostics

Microprocessor-based control monitors sensors and operates components. Access diagnostics via control panel.

Key Sensors: Fridge Compartment Temp, Freezer Compartment Temp, Ambient Temp, Door Switch (Fridge/Freezer), Ice Maker Thermostat.

Diagnostic Mode Entry: Press and hold "Ice Type" and "Light" buttons on control panel for 3 seconds (or refer to specific sequence). Use mode to test components (compressor, fans, heaters, valves) and view sensor readings.

Error Codes & Troubleshooting

Error Code	Description	Possible Cause	Corrective Action
FF / F5	Freezer Sensor Fault	Open/short circuit in sensor or wiring	Check sensor resistance (~10kΩ at 77°F). Replace if out of spec.
RF / R5	Fridge Sensor Fault	Open/short circuit in sensor or wiring	Check sensor resistance. Inspect wiring harness.
dH / dS	Defrost Heater/Sensor Fault	Heater failure, sensor fault, or defrost termination issue	Check heater continuity (~20-50Ω). Check defrost thermostat.
IE / ICE	Ice Maker Communication Fault	Communication error with ice maker control	Check connections to ice maker. Replace ice maker assembly.
LE / L5	Linear Compressor Communication	Communication fault between main PCB and inverter/compressor	Check wiring, connectors. Test inverter output. Replace compressor if needed.
CF / C5	Condenser Fan Fault	Fan motor failure or obstruction	Check fan for free spin. Test motor windings. Replace fan motor.
PF	Power Failure	Power interruption (normal display)	Indicates unit lost power. No repair needed.

Reset: Clear errors by unplugging unit for 1 minute, or through diagnostic mode.

Parts List & Ordering Information

Use genuine LG parts. Reference full parts list with diagrams for exact part numbers.

Linear Compressor Assy: Part # varies by serial number range.
Main Control Board (PCB): EBR77634703 (example)
Inverter PCB: EBR77634704
User Interface (Control Panel): EBR77634705
Evaporator Fan Motor (Fridge): EBR77634706
Evaporator Fan Motor (Freezer): EBR77634707
Craft Ice Maker Assembly: EBR77634708
Water Filter: LT1000P
Door Gasket (Refrigerator): EBR77634709
Temperature Sensor (Freezer): EBR77634710

Ordering: Contact LG Parts at 1-800-243-0000 or visit www.lgpartsonline.com with model and serial number.

Test Mode & Performance Verification

After repair, perform operational tests to verify performance.

Sealed System: Check for leaks. Monitor pull-down temperatures.
Compressor Operation: Listen for normal sound. Check amp draw (compare to rated).
Temperature Performance: Set fridge to 37°F, freezer to 0°F. Allow 24 hours to stabilize.
Ice Maker Cycle: Fill water system, initiate ice maker cycle, verify ice production and harvest.
Defrost Cycle: Force defrost via diagnostic mode, verify heater operation and termination.
Door Switches & Lighting: Verify lights turn on/off with doors.
Dispenser: Test water and ice dispensing.
SmartThinQ: Connect to Wi-Fi, verify app connectivity.

Service Contact: LG Customer Service: 1-800-243-0000. LG Service Website: www.lg.com/us/support.