LG LFC20770ST/01 bottom-mount refrigerator Parts

On the LG LFC20770ST bottom-mount refrigerator, the drain pan (defrost drain pan) is typically located at the bottom rear of the cabinet, near the compressor and condenser area, where it collects water from the defrost drain to evaporate. For safety, unplug the refrigerator before accessing it; see the LFC20770ST owner’s manual.

How to access the drain pan area

1. Unplug the refrigerator.
2. Pull the refrigerator straight out to create working space.
3. Look at the lower back of the unit; the pan is usually behind the lower rear access cover.
4. If needed, remove the rear lower cover panel screws and set the panel aside.
5. Locate the shallow plastic pan sitting on or near the base frame by the compressor.

What you may need

• Phillips screwdriver
• Work gloves
• Towel or shallow tray (in case of water)
• Vacuum or coil brush (optional)

Drain pan vs. dispenser drip tray (common mix-up)

Many LG owners call the dispenser drip tray a “drain pan,” but it is a different part and location.

Item	Where it is	What it does
Defrost drain pan	Bottom rear, near compressor	Evaporates defrost water
Dispenser drip tray	Front door dispenser area (if equipped)	Catches spills from dispensing

When the drain pan needs attention

Check the drain pan area if you notice:

• Water pooling under the refrigerator
• Musty odors near the back of the unit
• Excess water after heavy defrosting or high humidity
• Evidence of a clogged or leaking drain line

If you suspect a cracked or damaged pan on this model, the compatible replacement is the refrigerator defrost drain pan AEC72997401.

Why it matters

A properly positioned, intact drain pan helps prevent floor damage and odors by safely collecting and evaporating defrost water. If the pan is missing, shifted, or cracked, water can leak onto the floor instead of evaporating.

Last updated: January 2026

Repairs on an LG bottom-mount refrigerator like model LFC20770ST can range from fairly affordable (switches, sensors, valves) to expensive (cooling system and compressor work). The biggest cost driver is usually labor and sealed-system service, not the price of small replacement parts. See the warranty section in the LFC20770ST owner’s manual.

What typically costs the most

Sealed-system repairs (compressor, refrigerant work, brazing) are usually the highest-cost jobs and often require a licensed technician. Smaller repairs are commonly DIY-friendly if you are comfortable with basic troubleshooting.

• Sealed-system diagnosis and repair (compressor, refrigerant handling)
• Electronic control issues (control board, wiring)
• Cooling airflow problems (evaporator fan motor, defrost sensor)
• Water and ice system leaks or no-ice issues (inlet valve, ice maker)

Common repairs and relative cost (typical)

Repair area	Example symptom	Typical cost level
Door and light circuits	Light stays off, door alarm issues	Low
Water/ice supply	No ice, slow fill, leaking	Low to medium
Airflow/defrost	Warm fridge, frost buildup	Medium
Sealed system	Not cooling, loud compressor, no frost pattern	High

Model-specific notes for LFC20770ST

Your LFC20770ST manual includes an LG limited warranty section that calls out coverage periods for the refrigerator/freezer and the sealed system (compressor, condenser, evaporator). In many real-world cases, even when a covered part applies, you may still pay for labor and any non-covered service items. Check the details in the LFC20770ST owner’s manual.

Parts that can keep repair costs down

When the issue is isolated to a replaceable component, the repair is often much more manageable.

• If the interior light or door alarm acts up, check the refrigerator door switch 6600JB1010A.
• If you have ice maker fill problems or water leaks, inspect the LG refrigerator water inlet valve AJU73753101.
• If cooling is weak but the compressor runs, an airflow issue can involve the refrigerator evaporator fan motor 4681JB1027N.

Why it matters

Knowing whether your problem is a “part swap” (valve, switch, sensor) or a sealed-system issue helps you set expectations. Parts-only repairs are usually faster and less expensive; sealed-system work is specialized and typically costs the most.

Last updated: January 2026

The most common ice-related complaint we see on LG refrigerators like model LFC20770ST is no ice production (the ice maker stops making ice). In many cases, the root cause is a water supply issue, a frozen fill path, or a failing ice maker or inlet valve; start with the checks in the LFC20770ST owner’s manual.

Quick checks first (no tools)

• Confirm the ice maker is turned ON and the ice bin is seated correctly.
• Make sure the freezer is cold enough; warm freezer temps slow or stop ice.
• Check that the household shutoff valve is fully open and the water line is not kinked.
• Look for ice clumps in the bin that can block the ejector.
• If ice production is slow, use the Ice Plus feature (if equipped) and wait 24 hours.

The most common causes (and what they point to)

Symptom	Most likely cause	What to do next
No ice at all	No water getting to ice maker	Inspect water supply; consider the LG refrigerator water inlet valve AJU73753101 if water flow is weak
Small or hollow cubes	Low water pressure or restricted valve	Verify pressure and line; valve may be sticking
Ice maker cycles but no fill	Frozen fill tube or valve not opening	Thaw fill area; test valve operation
Slow ice production	Freezer too warm or heavy use	Adjust controls; avoid blocking vents

When a part is commonly involved on LFC20770ST

If your water supply checks out and the freezer temperature is normal, the next most common failure points are:

• Ice maker assembly (mechanical or internal heater issues)
• Water inlet valve (weak fill, intermittent fill)
• Fill tube grommet or gasket (air leaks, icing around the fill area)

For a known-good replacement that fits this model, we typically start with the LG refrigerator ice maker assembly model AEQ72909603.

Why it matters

Ice production depends on two things working together: freezer temperature and steady water delivery. If either is off, the ice maker can stop completely, make poor-quality cubes, or produce ice very slowly.

Last updated: January 2026

Yes, on the LG LFC20770ST bottom-mount refrigerator you can replace many common parts yourself if you’re comfortable using basic hand tools and you follow the safety steps in the LFC20770ST owner’s manual. We recommend leaving sealed-system and refrigerant work to a qualified technician.

What you can usually replace yourself

These repairs are typically DIY-friendly on bottom-mount refrigerators like the LFC20770ST:

• Door items: bins, handles, and some gaskets
• Ice maker components (if your model is equipped)
• Water inlet valve (for no-ice or no-water symptoms)
• Door switch (for light or fan behavior tied to door position)
• Drawer rails and bins

Repairs we recommend a pro handle

Some components involve specialized tools, electrical diagnostics, or sealed-system work:

• Compressor and sealed-system components
• Refrigerant leaks or recharging
• Complex control-board diagnosis when symptoms are unclear

Quick DIY safety checklist

Before you start any repair on the LFC20770ST:

• Unplug the refrigerator (do not rely on control settings)
• Turn off the water supply if you’re working on water/ice parts
• Protect floors and get help moving the unit (it’s heavy)
• Use the correct screwdriver/Allen wrench sizes for handles and panels
• Take photos of wire connectors and routing before disconnecting anything

Common DIY jobs and the parts they involve

Symptom	Likely DIY check/repair	Example compatible part for this model
Ice maker not making ice	Check fill tube, valve supply, ice maker assembly	LG refrigerator ice maker assembly model AEQ72909603 AEQ72909603
No water to ice maker	Inspect/replace inlet valve	LG refrigerator water inlet valve AJU73753101
Interior light issues when door opens/closes	Test/replace door switch	Refrigerator door switch 6600JB1010A

Why it matters

Choosing the right DIY repair saves time and avoids repeat failures. On the LFC20770ST, many “no ice” or “light not working” complaints trace back to simple, replaceable parts, while sealed-system issues require specialized service.

Last updated: January 2026

On the LG LFC20770ST bottom-mount refrigerator, the most common “problem” customers notice is uneven cooling: the fresh food section warms up while the freezer stays cold. This usually points to an airflow restriction, a defrost-system issue, or a temperature-sensing problem.

Quick checks we recommend first

• Make sure food packages are not blocking the air vents between the freezer and refrigerator sections.
• Confirm the refrigerator and freezer controls are set correctly; allow 24 hours for temperatures to stabilize after changes.
• Check that both doors close fully and the door gaskets seal all the way around.
• Listen for the evaporator fan running; weak or no airflow often means a fan problem or frost buildup.
• Look for frost or ice buildup on the freezer back wall, which can indicate a defrost issue.

Model-specific guidance for LFC20770ST

The LFC20770ST is designed for air to circulate between the freezer and refrigerator compartments. If vents are blocked or airflow is reduced, the refrigerator section can warm up even while the freezer stays very cold. We follow the airflow and control-setting guidance in the LFC20770ST owner’s manual.

Parts that commonly relate to this symptom (when diagnosis confirms)

These model-compatible parts are often involved when the symptoms match:

Symptom you see	What to inspect	Example compatible part for this model
Fridge warm, freezer cold	Evaporator airflow	Refrigerator evaporator fan motor 4681JB1027N
Temps swing or seem inaccurate	Temperature sensing (thermistor)	Refrigerator thermistor 6500JB2002T
Frost buildup, poor airflow	Defrost sensing	Refrigerator defrost sensor assembly 6615JB2005C

Why it matters

Uneven cooling can spoil food in the fresh food section and make the compressor run longer than normal. Fixing airflow problems early can also help prevent heavier frost buildup and repeat temperature swings.

Last updated: January 2026

On LG model LFC20770ST, water leaking from the bottom is most often caused by a clogged or frozen defrost drain that overflows into the cabinet, or a leak in the ice maker water supply (valve, tubing, or ice maker). Start by identifying whether the water is from defrost meltwater or the water line.

Quick checks we recommend first

• Unplug the refrigerator before removing panels or inspecting wiring.
• Look for ice on the freezer floor or water under the crisper drawers (common with a blocked defrost drain).
• Check the rear lower area for drips around the water valve and tubing.
• Confirm doors close and seal well; warm air can create excess condensation.
• Make sure the unit is level so water drains correctly into the pan.

Most common causes on this model

1) Clogged or iced-over defrost drain

During defrost, meltwater should flow through the drain to the drain pan. If the drain is blocked, water backs up and leaks near the bottom front.

• Melt ice in the drain trough with warm water.
• Flush the drain until it runs freely.
• Inspect the drain path for splits or restrictions.

Helpful part:

• Refrigerator drain tube 5251JA3003D

2) Ice maker or water inlet leak

A loose fitting, cracked tube, or seeping valve can run down and pool underneath.

• Watch for drips shortly after the ice maker fills.
• Check for mineral buildup or wetness at fittings.

Helpful parts:

• LG refrigerator water inlet valve AJU73753101
• LG refrigerator ice maker assembly model AEQ72909603 AEQ72909603

Symptom-to-cause guide

What you notice	Most likely cause	Where to check
Ice on freezer floor, then puddle	Defrost drain clogged/frozen	Freezer drain trough and drain tube
Water after ice maker runs	Valve/tubing/ice maker leak	Back lower valve area and fill path
Water under crispers	Drain backup or condensation	Drain path and door sealing

Why it matters

Stopping the leak quickly helps prevent ice buildup, odors, floor damage, and airflow problems that can affect cooling.

For safety notes and access guidance, follow the LFC20770ST owner's manual.

Last updated: January 2026