Lg Refrigerator LFC20770ST Doesn't shut off

The Defrost Sensor Assembly is an OEM part for LG refrigerators. It plays a critical role in the defrost system by monitoring the temperature of the evaporator coil to ensure that it remains at the optimal temperature to prevent frost buildup. The sensor sends signals to the control board, triggering the defrost cycle when necessary.

Over time, the defrost sensor assembly can fail due to wear and tear, electrical issues, or exposure to moisture and temperature fluctuations. When the defrost sensor malfunctions, it can cause improper defrost cycles, leading to excessive frost buildup, reduced cooling efficiency, or the refrigerator not defrosting at all.

Symptoms of a bad defrost sensor assembly include:

• Excessive frost buildup on the evaporator coils
• Refrigerator or freezer not maintaining the correct temperature
• Increased energy consumption
• Refrigerator not defrosting properly

This OEM LG part is also compatible with Sears/Kenmore.

Door Gasket Assembly restores the door seal to prevent air leaks and help maintain proper temperatures. Replacing a cracked, warped, or torn gasket can reduce frost, moisture, and temperature fluctuations in the compartment. What it does:

• Forms an airtight seal around the door to keep cold air in and warm, humid air out.
• Replaces damaged or deformed gasket material that can cause leaking, frost buildup, puddling, or inconsistent temperatures.
• Helps the appliance run more efficiently by reducing excessive compressor run-time caused by air infiltration.
• Seats into the door channel and seals when the door is fully closed to protect stored contents.

• Disconnect power to the appliance (and shut off water supply if applicable) before starting any work.
• Remove the old gasket, thoroughly clean the door-mating surface, then align and press the new gasket into the channel working around the full perimeter for even seating.
• Some gaskets use mounting clips, screws, or adhesive; retain original hardware and follow the model-specific service instructions if present.

This replacement refrigerator door gasket forms a tight seal between the door and cabinet to keep cold air in and moisture out. Restores proper sealing to help maintain temperatures, reduce frost/condensation, and improve efficiency when the old gasket is worn. What it does:

• Seals the door perimeter to limit air leaks between the door and cabinet
• Helps maintain stable internal temperatures and reduce energy waste
• Minimizes condensation, moisture, and frost around the door opening
• Common failure signs: tears, cracks, warping, gaps, persistent condensation, or doors not sealing properly

• 1 door gasket

• Unplug the refrigerator before servicing.
• Remove door bins/shelves for access. Pull the old gasket from the retainer/channel and clean the mounting surface.
• Warm the new gasket (hot water or low-heat hair dryer) to relax folds. Seat corners first, then press along the sides until fully engaged. On some models, slightly loosen retainer screws; do not overtighten.
• Close the door and check for an even seal all around (paper-slip test). Adjust and reshape as needed.

This DC motor powers the appliance's cooling fan to move air across coils and through compartments. Replacing a weak or failed motor restores proper airflow for steadier temperatures and quieter, more efficient operation. What it does:

• Drives the fan that circulates air through the evaporator or across the condenser
• Helps maintain even cooling and prevent temperature swings
• Replaces a motor that won't start, runs intermittently, or makes grinding/squealing noises
• Can help address poor cooling, warm spots, or frost/ice buildup from lack of airflow

• 1 DC motor

• Disconnect power before servicing; wear cut-resistant gloves
• Access the fan area per service information (rear interior panel or machine compartment)
• Transfer the fan blade and any grommets/brackets/screws from the original motor if needed
• Seat the motor securely, route wires clear of the blade, and verify the fan spins freely before reassembly