For owners of the 2020 LG bottom-freezer model, locating the correct replacement elements can save hours of troubleshooting. Start by identifying the serial number plate inside the fridge–usually on the left wall near the crisper drawers. This label includes a 12-digit code that pinpoints the exact build version. Cross-reference this code with LG’s official service schematics to avoid mismatched components, which often cause improper seals or cooling inefficiencies. Third-party sellers frequently mislabel evaporator fans, door seals, and water filters; double-check compatibility with LG’s Part Number Reference Guide before ordering.
The most commonly replaced items–ice makers (part #AJH33728603), thermistors (#EAE41764801), and main control boards (#EBR73662901)–require exact matches. For instance, a thermistor with a ±1°C tolerance deviation can disrupt defrost cycles, leading to frost buildup in less than three weeks. If replacing the compressor (#EAE60122801), ensure the new unit’s wattage matches the original–LG uses two variants (180W and 205W) for this series, and swapping them voids warranty coverage.
For door assemblies, note that left and right hinges (#4975JJ2028C) are not interchangeable. The upper hinge alone weighs 0.8 kg more than the lower to counteract shelf load–installing them backward causes misalignment within 48 hours. When sourcing shelves, opt for tempered glass (#3021JJ2017A) rather than acrylic; LG’s internal tests show acrylic loses structural integrity under loads exceeding 15 kg, while tempered glass withstands 32 kg without deflection.
Always verify part dimensions with calipers before installation. The condensate drain tube (#5001JJ2011B) must measure 4.8 mm ID–fractions of a millimeter off will cause slow drainage and mold growth along the rear panel. For electronic components, discharge the capacitor (located behind the access panel) by shorting it with a 10kΩ resistor for 30 seconds to prevent damaging the main board during replacement.
LG Refrigerator Component Breakdown: Step-by-Step Repair Manual
Locate the main evaporator fan assembly behind the back panel inside the freezer compartment. Use a ¼-inch nut driver to remove the single mounting screw securing the fan cover. Disconnect the wiring harness by pressing the release tab–avoid pulling the wires directly. If the fan blade spins unevenly or makes grinding noises, the motor bearings are likely worn. Replace the entire assembly (part #EBR73809201) rather than attempting a bearing repair, as sealed units fail predictably after 6-8 years.
Common Failure Points and Immediate Fixes
- Ice maker auger motor: Overheating triggers error code “Ic.” Unplug the refrigerator, wait 10 minutes, then restart. If the issue persists, access the motor by removing the ice bucket and rear cover. Check for ice buildup around the housing–thaw with a hairdryer if frozen. Replace the motor (part #EAU73114801) if the auger stalls during rotation tests.
- Water filter housing leaks: First, shut off the water supply beneath the sink. Remove the lower grille to expose the inlet valve. Inspect the blue plastic elbow fitting for cracks–replace the housing (part #ADQ36006101) if damaged. Tighten connections with a wrench, ensuring the O-ring sits flush in its groove before reassembly.
- Door seal gaps: Run a dollar bill around the perimeter. If the seal slips easily, clean it with warm soapy water and dry thoroughly. For persistent gaps, heat the gasket with a heat gun (low setting) to reshape it. Replace the seal (part #MDD62674801) only if heating fails–most seals regain flexibility after proper cleaning.
Replace the refrigerator’s dual inverter compressor only after verifying low startup voltage (below 105V AC) with a multimeter. If voltage is stable, recover refrigerant using a vacuum pump (minimum 250 microns) and filter-dryer (part #EAJ73186902). Install the new compressor (part #EAU12526901) with fresh refrigerant (17 oz R600a). Evacuate for 30 minutes, then recharge per the sealed system repair checklist–avoid shortcuts, as improper evacuation damages the compressor’s motor windings.
- Remove the upper hinge cover by prying the plastic clips with a flathead screwdriver. Disconnect the LED display ribbon cable (label its position) before lifting the top door panel.
- Detach the inner door liner by unscrewing the 10 Torx T20 screws along the perimeter. Keep screws organized–note their lengths, as incorrect reinstallation strips the threads.
- Inspect the mullion heater wire for brittleness. If cracked, replace it (part #EBR38870101) before reassembling. Test continuity with a multimeter (resistance should read 200-300 ohms).
- Realign the door liner, ensuring the foam gasket seats fully into the door cavity. Tighten screws in a star pattern to prevent warping. Reconnect the ribbon cable, then snap the hinge cover back into place.
For defrost cycle failures, check the bi-metal thermostat (part #EAJ35900101) mounted on the evaporator coil. Use a hairdryer to warm the coil–if the thermostat doesn’t click, replace it. Clean the defrost heater element (part #EBR38870102) with isopropyl alcohol to remove oxidation. Verify heater resistance (30-60 ohms) before reinstalling. Reset the control board via the diagnostic mode: press “Ice Plus” and “Lighting” simultaneously for 5 seconds, then select “FF” to clear error histories.
How to Access LG’s Authorized Component Inventory for Your Model
Directly visit LG’s official support portal and enter the serial number stamped on the inner door frame–this bypasses third-party suppliers and guarantees OEM authenticity. Filter results using the exact product category (counter-depth French-door refrigerators, 31 cubic feet, stainless steel finish) to eliminate irrelevant listings. The site displays real-time stock, part numbers, and compatibility warnings, ensuring precise matches for components like evaporator fans (AP5990500), water filters (ADQ73613403), or main control boards (EBR73611901).
Alternative Verification Channels
If the LG portal fails, cross-reference findings through Sears PartsDirect or PartSelect–both aggregate OEM data and list schematic identifiers (e.g., “shelf bracket 5060JP2002B”) alongside user reviews flagging installation pitfalls. Avoid generic marketplaces like eBay or AliExpress; counterfeit door seals or compressors often lack UL certification and void warranties.
Identifying Key Elements in Your LG Refrigerator’s Assembly Breakdown
Begin by locating the compressor at the rear base–typically a black or silver cylindrical unit with copper coils. This component drives refrigerant through the cooling system; verify its attachment points (three screws or mounting brackets) before disassembly. If coils appear corroded or refrigerant lines show leaks, replace the entire assembly rather than patching, as failed seals compromise efficiency.
The evaporator and condenser coils sit behind interior panels. The evaporator, usually behind the freezer compartment, collects frost buildup; defrost it with a hairdryer on low heat if ice exceeds 0.5 cm. The condenser, mounted externally at the back, requires biannual vacuuming to remove dust that reduces heat dissipation by up to 30%. Use a fin comb to straighten bent fins, ensuring optimal airflow.
| Component | Location | Failure Signs | Recommended Action |
|---|---|---|---|
| Door gasket | Perimeter of fresh/freezer doors | Gaps, condensation, uneven sealing | Clean with mild soap; replace if splits exceed 2 mm |
| Ice maker motor | Upper right rear of freezer | Grinding noises, ice blockages | Lubricate gears; replace motor if resistance >12 ohms |
| Fan blades | Behind evaporator/freezer vents | Unusual humming, inconsistent cooling | Clear obstruction; balance blades with shims |
Inspect the water inlet valve behind the lower kick plate by testing for 120V AC at its terminals while activating the dispenser. If voltage is present but no water flows, the valve’s solenoid is faulty (ohms should read 200–500). Replace it as a single unit–attempting repairs voids anti-leak seals. Note the valve’s flow rate: models post-2020 restrict output to 2 oz/second; deviations indicate clogged filters or compromised tubing.
The control board, nestled behind the refrigerator’s upper rear cover, regulates defrost cycles and compressor timing. Check for burnt capacitors or corroded solder joints–symptoms include erratic cooling or non-responsive displays. Use a multimeter to test key pins: J1 should output 5V DC to the temperature sensor, while J3 handles AC power distribution. Replace the board if readings deviate by ±10%.
Thermistors (NTC type) monitor temperature at three points: fresh food, freezer, and evaporator. At room temperature (25°C), resistance should measure ~10 kΩ; values outside 8–12 kΩ require recalibration or replacement. For the evaporator sensor, defrost the unit before testing to avoid false readings from residual ice. Label each wire during removal–misconnections trigger compressor overload errors.
Understanding the Electrical Schematic of Your LG Refrigerator Model
Locate the main power input terminals on the left side of the schematic. These are typically labeled L (line), N (neutral), and G (ground). Verify the voltage rating matches your household supply–commonly 120V AC in North America or 220-240V AC in other regions. Trace the red line from L to the thermal fuse, then to the compressor relay coil. If the fuse appears intact but no voltage reaches the relay, inspect the door switch connections for continuity using a multimeter.
Identify the compressor circuit branches marked CR1 and CR2. These represent the start and run capacitors. On the schematic, CR1 connects to the compressor’s start winding via a PTC (positive temperature coefficient) relay, while CR2 links to the run winding. Measure resistance across each winding: start winding should read 3-15 ohms, run winding 1-6 ohms. A reading of 0 or OL indicates a short or open circuit–replace the compressor if either condition is confirmed.
Follow the defrost heater line, usually drawn in blue, to its thermostat and timer contacts. The heater activates when the thermostat closes at 45°F (7°C) and the timer in defrost mode allows current. Test the thermostat by placing it in ice water–resistance should drop to near zero at freezing. If the heater fails to warm the evaporator coil during defrost, check for a broken wire or corroded connector at the evaporator.
Inspect the control board section, often clustered at the top with labeled pins such as PCB-1, PCB-2, and COM. Using the legend, match each pin to its function: ice maker solenoid (pin 5), fan motor (pin 7), or temperature sensor (pin 9). If the unit powers on but functions erratically, probe voltage at these pins–absence of 12V DC suggests a faulty board or disconnected harness. Replace the control module if internal damage is visible or testing confirms failure.