LG Refrigerator LFX28968ST Repair Manual

The LG LFX28968ST is a 28 cubic foot French Door refrigerator with InstaView Door-in-Door, Craft Ice™ maker, Smart Cooling Plus™ system, and Wi-Fi connectivity. This repair manual provides essential information for troubleshooting, component replacement, and maintenance procedures. Below are key sections covering safety, diagnostics, parts, disassembly, and reassembly.

1. Safety Precautions 2. Model Specifications 3. Diagnostic Mode & Error Codes 4. Component Testing 5. Common Parts Replacement 6. Disassembly Procedures 7. Electrical Diagrams 8. Refrigerant System 9. Reassembly & Testing 10. Warranty & Support 11. Troubleshooting Flowcharts

Safety Precautions

Before performing any repair, ensure personal safety and prevent damage to the refrigerator.

Hazard	Precaution
Electrical Shock	Unplug unit before servicing. Disconnect power at circuit breaker.
Refrigerant	Only EPA-certified technicians may handle refrigerant lines.
Sharp Edges	Wear cut-resistant gloves when handling interior panels or evaporator covers.
Heavy Components	Use assistance when lifting compressor or condenser assemblies.
Chemical Exposure	Ventilate area when handling insulation or cleaning agents.

Model Specifications

Model: LFX28968ST
Type: French Door with Bottom Freezer
Capacity: 28 cu. ft. (793 liters)
Dimensions (HxWxD): 69.875" x 35.75" x 34.5"
Voltage: 120V AC, 60Hz
Refrigerant: R-600a (Isobutane)
Defrost System: Adaptive Defrost with Heater
Ice Maker: Craft Ice™ Sphere Maker + Standard Cubes
Smart Features: LG ThinQ® Wi-Fi, Smart Diagnosis

Diagnostic Mode & Error Codes

Access diagnostic mode by holding "Freezer" and "Light" buttons for 3 seconds. Error codes display on control panel.

Enter Diagnostic Mode: Buttons vary by model; refer to panel diagram.
Navigate Tests: Use Temp buttons to cycle through component tests.
Interpret Codes: Note flashing lights or alphanumeric display.
Exit Mode: Press Power or wait 10 minutes.

Common Error Codes: FF (Freezer Fan), CF (Condenser Fan), dH (Door Open), PS (Pressure Switch).

Component Testing

Use multimeter to test continuity and resistance of key components.

Component	Test Procedure	Expected Values
Compressor	Check terminals (C-S-R) for continuity.	Resistance: 2-10Ω between pairs.
Evaporator Fan	12V DC motor; test for free spin and voltage.	Continuity present; spins freely.
Defrost Heater	Disconnect; measure resistance across terminals.	20-40Ω; infinite = open.
Thermistor	Resistance changes with temperature (10kΩ at 77°F).	Check against temp/resistance chart.
Main Control Board	Inspect for burnt traces; test input/output voltages.	5V, 12V present at designated pins.

Common Parts Replacement

Frequently replaced parts include water filter, door gaskets, ice maker assembly, and fans.

Water Filter (LT1000P): Twist counterclockwise to remove; align new filter and twist clockwise.
Door Gasket: Peel off old gasket from channel; align new gasket and press into track.
Ice Maker Assembly: Disconnect electrical and water lines; remove mounting screws.
Evaporator Fan: Remove rear panel in freezer; disconnect harness and mounting bracket.

Note: Use genuine LG parts for compatibility.

Disassembly Procedures

Step-by-step guide to access internal components.

Unplug refrigerator and remove food/ shelves.
Remove door trim and hinge covers (Torx T20).
Detach control panel by prying clips carefully.
Remove rear panel in freezer compartment to access evaporator.
Remove kickplate and front grille to reach compressor area.
For condenser fan, remove rear lower panel (outside unit).

CAUTION! Label wires and take photos during disassembly for reassembly reference.

Electrical Diagrams

Refer to wiring diagram sticker inside refrigerator or service manual for full schematic.

Main Components: Control Board (Part # 6325MB-1002A), User Interface Board, Inverter Board (if linear compressor), Defrost Controller, Thermistor Network.

Connector Types: Molex-style connectors; ensure secure seating during reassembly.

Refrigerant System

Sealed system containing compressor, condenser, evaporator, capillary tube, and filter-drier.

Leak Detection: Use electronic leak detector or bubble solution at joints.
Evacuation: Required after opening system; use vacuum pump to 500 microns.
Charging: Weigh in R-600a charge per data plate (approx. 2.0 oz).
Pressure Readings: Low side: 0-5 psi; High side: 100-150 psi (varies by ambient).

WARNING! R-600a is flammable. No sparks or open flames. Follow EPA Section 608.

Reassembly & Testing

After repair, reassemble in reverse order and perform functional tests.

Reconnect all electrical connectors and secure panels.
Restore power and enter diagnostic mode to clear error history.
Verify cooling: Monitor temperatures (Freezer: 0°F, Fridge: 37°F).
Test ice maker: Run 2-3 cycles; check for leaks and ice production.
Confirm door switches, lights, and display functions.

Final Check: Ensure no unusual noises, leaks, or error codes.

Warranty & Support

Standard limited warranty: 1 year parts & labor, 5 years sealed system, 10 years linear compressor. Proof of purchase required.

For technical support, contact LG at 1-800-243-0000 or visit www.lg.com. Provide model and serial number (located inside left wall).

Troubleshooting Flowcharts

Symptom	Possible Cause	Corrective Action
Not cooling	Dirty condenser, failed fan, low refrigerant	Clean condenser coils; test fans; check for leaks.
Ice maker not working	Water valve, clogged filter, faulty module	Test water valve voltage; replace filter; inspect ice maker harness.
Display blank	Power issue, control board failure	Check outlet, wiring, and control board voltages.
Water leak	Clogged drain tube, cracked water tank	Clear drain with warm water; inspect water tank for cracks.
Loud noise	Fan obstruction, compressor mount loose	Inspect fans for debris; tighten compressor mounts.

Smart Diagnosis: Use LG ThinQ app to run diagnostics if Wi-Fi connected.

Service Manual Updates: Check LG service portal for bulletins.