In short
A LG freezer that runs but stays soft is nearly always losing the argument with its surroundings. Work down the ranking below — ordered for this brand — and give each change a full day before judging it, because a freezer that has warmed through takes that long to pull back down.
What the fault looks like
- The outside of the cabinet is warm to the touch — Normal in moderation: the cabinet sheds heat through its skin. Hot, in a hot room, is another matter.
- Food is soft or partly thawed while the unit runs — The compressor is audible, the light works, and the contents are not hard.
- NEAR MISS — the unit is silent with no light and nothing running — That is a power or start fault rather than a cooling fault, and it belongs on the page for a unit that will not start.
Causes, most likely first
- A condenser coil that cannot shed heat — Whether it is a coil on the back, a coil underneath or tubing bonded into the cabinet skin, the heat has to get out. Dust, lint and pet hair over that surface — or a fan bound with debris — produce a unit that runs continuously and freezes poorly. Top of the list on this one: in the rooms these units live in the coil collects dust faster than anywhere in the house, and nobody cleans it. LG is a major manufacturer with a documented parts catalogue and an established service network, so the question on this brand is usually which part rather than whether a part can be had.
- The lid or door is not sealing — A freezer has one barrier between the food and the room. A gasket that has hardened, a hinge that has dropped, or a lid held a fraction open by a packet will let warm air in continuously, and the unit will run without ever winning. Next in order: it is free to test and it either passes or it does not.
- How it is loaded and how often it is opened — A freezer packed to the lid has no air path; a nearly empty one has no thermal mass and loses everything each time it is opened. Loading a large quantity of unfrozen food at once will hold any freezer above temperature for a day or more without a fault being present. Third on this list: it contributes more often than it causes, but it is worth ruling out before anything is opened.
- A control or sensor reading wrongly — The control stops the unit when its sensor says the cabinet is cold enough. A sensor that reads colder than reality, or a setting knocked to a warmer position, produces a freezer that behaves perfectly and simply stops too soon. Fourth in order: it is a diagnosis by elimination, which is why it follows the physical checks.
Work through it in this order
- Look at the coil or the back of the cabinet — Grey felt across the fins, or a fan packed with dust, is enough on its own to hold a cabinet above temperature.
- Close the lid or door on a sheet of paper and pull it out — Test several points around all four sides. Anywhere the paper slides free, warm air is getting in there continuously.
- Look at how the cabinet is packed and when it was last loaded — A large fresh load in the last day or two explains a soft cabinet entirely, and so does a vent blocked by a box.
What you can do yourself
- Unplug the unit and vacuum the coil and fan — A brush attachment reaches most of it; unplug first, because the fan can start without warning.
Tools: vacuum, soft brushAbout 25 min
- Clean the gasket and the sealing face, and check nothing is holding it open — Warm soapy water on both surfaces, then the paper test again at each corner. On a chest freezer, check the lid closes flat with nothing under the rim.
Tools: cloth, mild detergentAbout 15 min
- STOP before removing any panel or reaching into the machinery compartment — Live terminals and a sealed refrigerant circuit sit behind it. Naming the likely cause is the useful outcome of an owner check.
Safety, before the checks
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Never chip ice off the inside of a freezer with a knife or a screwdriver: on many cabinets the cooling tubing runs immediately behind that surface, and a puncture ends the appliance.
Where the owner's part ends
Call once the seal, the room, the load and the coil are all clear and the cabinet still will not hold 0 °F (−18 °C). At that point the fault is in a fan, a control or the sealed system, all of which sit behind live terminals.
Nearest pages of this class
The limits of this page
Generalized information. This page is about LG freezers as a class rather than one family or model line, and a family-specific page, where one exists, is the more precise answer for your unit. Not covered here: component locations, part numbers and any figure that changes between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
