LG refrigerators with Smart Inverter compressors and door sensors often exhibit delayed cooling after the door is shut, especially in newer French-door models. This behavior can occur due to Eco Mode settings or a failing door sensor misreporting the door as open. As a result, the compressor pauses unnecessarily. Disabling energy-saving modes or replacing the sensor typically resolves the issue.

Unlike traditional rotary compressors, LG's linear compressors operate quietly sometimes misleading users into thinking the unit is running normally when it's not cooling. If the fridge or freezer temperature climbs while the compressor is active, the internal piston mechanism may be worn or the inverter board may have failed. These repairs are specific to LG and often require OEM parts.

Modern LG fridges include diagnostic codes on their display panels. Common faults like "FF" (freezer fan error) or "ER DH" (defrost heater error) usually indicate failed internal components, not user error. Each code points to a precise system fan motor, defrost circuit, or control board. LG service manuals help decode these alerts and guide accurate repairs.

In premium LG models with InstaView doors, the glass panel may stop lighting up or respond intermittently to knocking. This usually stems from a faulty proximity sensor or a damaged ribbon cable inside the door hinge. Moisture ingress and frequent door flexing are common culprits. Careful reassembly and sealing are required to restore functionality.

Many LG French-door refrigerators use a slim indoor ice maker that's prone to freezing up in humid environments. If cubes jam inside or the dispenser motor fails to engage, the issue could be a blocked fill tube, failed auger motor, or a misaligned bucket. Regular defrosting and seal inspection are key to preventing this problem long-term.