How to Reset LG Refrigerator Error Codes

LG refrigerators reset by power cycle; their Er codes are live system reports that clear when their systems behave. This page covers the power-cycle procedure, the resets that do exist on the panel (filter indicator, demo mode), and the post-reset behaviour of the common Er families (fans, defrost, sensors, compressor drive).

The power cycle

Unplug for 5–10 minutes (let the control discharge and compressor pressures equalise), restore, and allow up to 24 hours for temperatures to stabilise before judging. Er codes that were one-off glitches clear at the clean start-up; system codes return with their systems.

Panel resets that exist

Filter indicator: hold the Light/Filter (or marked) button ~3 seconds after a filter change. Demo mode: LG's display will show OF/FF-style demo states on many models — the exit is a button combination per model (commonly holding the marked pair with a door switch press involved); a non-cooling new fridge is in demo until proven otherwise.

Code behaviour

Er FF/CF/RF/IF (fans): return if the fan still can't run — check frost first. Er DH/dS (defrost): return as the defrost system fails again over days. Er FS/dS sensors: return immediately if the sensor is out of range. Compressor blink codes: a reset that buys a day is a dying drive introducing itself.

LG's own reset wording: five minutes, then judge by whether the code repeats

LG does not publish a master reset procedure for its refrigerators; it publishes the same short reset inside its individual error-code pages, and the repetition is the procedure. On the E CF page and again on the E FF / E rF page, the instruction is identical: unplug the power cord of the product or trip the exclusive circuit breaker to reset the power, and then reuse it after about 5 minutes. Both pages then print the same rider: if the same symptom and the same inspection code are repeated, it is necessary to have it checked by an LG service technician for an accurate diagnosis. Those two sentences together are the whole philosophy of resetting an LG refrigerator, and they are worth following literally rather than approximately. The reset is one attempt of a stated length — about five minutes, by cord or by breaker, the two being interchangeable in LG's wording — followed by observation. It is not a ritual to be strengthened with longer waits, repeated cycles or button choreography borrowed from other brands: LG's pages ask for five minutes because the control needs the power gone long enough to restart cleanly, and a fault that is still physically present will announce itself again on its own timetable regardless of how long the plug stayed out. The rider is the other half of the discipline. A code that repeats after the documented reset has completed LG's owner-level diagnosis for you: the reset was the test, the repeat is the result, and the result's name is a service visit. Owners who reset a third and fourth time are not troubleshooting further — they are declining the answer the first reset already gave, while the refrigerator spends those days cycling a fault its documentation has already routed.

The CF lesson: a reset that works for three hours

One sentence on LG's E CF page deserves its own section, because it calibrates every refrigerator reset you will ever judge: when you turn the power off and on again, the error will disappear, and it will appear again 3 hours later. The context is the condenser-fan code — a CF error appears if the fan motor which disperses heat from the mechanical compartment at the back of the refrigerator does not operate due to an abnormality, usually a fan motor failure, sometimes a wire disconnection or a main board problem — but the behaviour generalises across the platform: the display clears at restart because the control restarts, not because the fan healed, and the fault re-declares itself when the system next runs long enough to be measured and found wanting. For CF that measurement window is about three hours. The practical consequence is a judging rule: no LG refrigerator reset can be called successful inside the first hours after it. A clear display at minute ten is the reset having happened; a clear display the next morning is the reset having worked. This is also why the honest report to give a service line is not 'the code came back' but 'the code came back about three hours after the reset, twice' — LG's own page has told you the interval is the signature of a present fault, and a fault that performs on schedule is the easiest kind for a technician to catch. Conversely, a one-off code after a storm, a move or a power cut that clears at the five-minute reset and is still clear days later was the transient event it appeared to be, and the episode can be closed with a note of the code and the date.

The long reset: when LG prescribes a day — or three — with the doors open

There is exactly one refrigerator reset on LG's pages that is measured in days, and it belongs to the fan family for a physical reason. The E FF / E rF page explains that the error can occur when the fan motor is locked due to ice (frost) around the fan motor, and for that case LG's prescription is: unplug the power cord, open the freezer/refrigerator compartment door wide, and wait for the ice to melt — one day during summer, three days during winter. Read the seasons correctly and they stop sounding arbitrary: the melt is passive, driven by room temperature, and a winter kitchen surrenders frost three times more slowly than a summer one. Two consequences follow. First, this is the one reset where the food plan is part of the procedure — LG itself adds that if you are concerned about the food stored inside, it is recommended to have the product checked by a service technician by requesting a service, which is LG acknowledging that a three-day open-door melt and a full freezer are incompatible plans. Coolers, a neighbour's freezer, or the service visit are the real options; quietly shortening the melt to a few hours just re-locks the fan in thinner ice. Second, a frost-locked fan that returns is asking a question the melt cannot answer: frost grew around that fan because moist air reached it, and a door seal, a door left ajar habit, or a defrost-system shortfall is upstream of the ice. The reset guide's job is to get the fan turning today; if the FF display repeats its cycle of melt-and-return, the service conversation should be about where the frost comes from, not about melting it faster.

Demo mode: the 'reset' that is not a power cycle at all

The commonest refrigerator 'reset' search that is not about an error code at all concerns a fridge that lights up, responds to its controls and never cools — and its display shows OFF. LG's help library is blunt about it: if your LG refrigerator displays O F F in the control panel display, the unit is in Demo Mode (Display Mode), a feature that disables all cooling in the refrigerator and freezer sections to conserve energy while the appliance is on display in a store. No power cycle fixes demo mode, because nothing is wrong: the mode is a setting, it survives restarts exactly as a setting should, and it exits the way it entered — at the panel. LG's documented exit, repeated in its Use and Care Guides, is a door-open button hold: open the right refrigerator door (the guides say with either door open; the help-library video uses the right door), press and hold the Refrigerator and Ice Plus buttons at the same time for several seconds — the guides put the figure at 5 seconds — until the control panel switches to its normal settings and you hear the dispenser initialise or the panel beep and the temperature settings appear. The same procedure, run again, puts the refrigerator back into demo mode, which is why the mode occasionally reappears after enthusiastic panel cleaning on a new fridge. Two details protect the diagnosis. First, check for demo mode whenever a refrigerator is new, newly delivered or recently moved: the mode exists for showrooms, and a fridge that has never cooled since installation is in demo until proven otherwise. Second, do not let the OFF display be mis-filed as a fault code in a service call — 'it shows OFF and does not cool' is a complete, sufficient description, and the fix takes five seconds at the panel once it is recognised.

The resets that live on the panel: filter indicators

Not every refrigerator reset involves the power cord: the maintenance indicators reset where they live, on the panel, and LG's instructions for them are as specific as its error-code pages. After the water filter is replaced — LG recommends changing it every 3 to 6 months depending on water quality and use, or when the filter icon in the display indicates — the indicator is reset by pressing and holding the water filter button for 3 seconds. Model generations move the button rather than the gesture: LG's own reset guidance notes that depending on the model, the button held for 3 seconds or longer until the Water Filter LED turns off may be the ICE PLUS button, the Express Freeze button or the Water Filter button itself — the secondary-function asterisk system at work again, where the hold, dead centre on the button, is what distinguishes the reset from the button's everyday tap. LG's guidance adds a genuinely useful technique note for all of these holds: control panel buttons are sensitive, the fingertip must be applied dead centre on the button's main text, and presses that land off-centre risk no contact at all — a 'reset that doesn't work' is often a hold that never registered. For ThinQ-connected refrigerators there is a second, documented route: LG states that the water filter or air filter indicator can be reset directly from the LG ThinQ app, via Useful Features into Filter Management, where the Filter Reset button sits under the filter usage information — provided the refrigerator has been added to the account's appliance list. What none of these resets does is extend the filter: the 3-second hold restarts the indicator's countdown after a replacement, and resetting the light without changing a spent filter is bookkeeping, not maintenance.

The lock is not a reset target

A panel that will not respond invites a power cycle in most owners' minds, and on an LG refrigerator that instinct wastes an unplug: the unresponsive panel is usually the Lock function, and a lock is a preference, which a reset does not clear because it was never a fault. LG's manuals describe the function consistently across generations — the Control Lock / Lock function disables every other button on the display; it is off when power is first connected; you engage it by pressing and holding the Lock button for 3 seconds or more until the Lock icon displays, and you disable it the same way, holding the Lock button for approximately 3 seconds. Side-by-side manuals add the diagnostic tell: press a button other than Lock while the lock is set and the button will not function, while the Lock/Unlock icon flashes 3 times — three flashes that have sent many owners hunting for a blink code that does not exist, when the panel is simply announcing, in its own documented language, that it is locked. Older manuals name the same function Child Lock, with a dedicated CHILD LOCK button, a Lock LED, and the identical 3-second hold in both directions. The standing rule for this whole guide follows: before any reset aimed at a 'dead' or 'flashing' panel, run the lock test — one deliberate 3-second hold on the Lock button. If the panel wakes, the refrigerator needed no reset, no unplug and no diagnosis, and the episode belongs in the household-education column: someone held that button, and the panel did exactly what LG designed it to do.

After the reset: proving it with temperatures, not hope

A reset ends with a restart, but it is only proved over the following day, and LG's manuals supply the yardsticks. The factory default settings, per the Use and Care Guide FAQ, are 37°F (3°C) for the refrigerator and 0°F (−18°C) for the freezer — the numbers the display should return to and the numbers two inexpensive compartment thermometers should corroborate once the cabinet has had time to pull down. The manuals' second yardstick is patience with a figure on it: wait 24 hours before judging or adjusting, because a refrigerator restarted warm, restocked, or opened repeatedly for checking is still travelling toward its set points, and adjustments made inside that window chase a moving target. Build the proof into the routine: reset once, by LG's documented method; note the code, the time and the method in a line you will still have next month; set thermometers rather than trusting the display's target figures (the manuals remind you the displayed temperature is the target, not a measurement of the compartment); and then apply LG's own verdict rule from its error pages — the same symptom and the same inspection code repeated means an LG service technician. The pattern to report, when it comes to that, is the reset's full biography: which code, when it first appeared, what the five-minute reset did, how many hours the display stayed clear (the CF page's three-hour signature is worth naming if it matches), and what the thermometers read. That is a diagnosis half-finished before the technician parks — and it is only available to owners who reset once, properly, and watched, instead of resetting repeatedly and hoping.

Key takeaways

• LG fridges store their recent fault history in service mode — a technician reads it even after your reset clears the display.
• Verify temperatures with thermometers for a day after any reset before restocking expensive food.

Resetting the LG refrigerator

LG refrigerator error codes (the Er family) clear with a power reset: unplug for about 5 minutes (or hold the control's reset where fitted) and restore power. Fan and sensor codes that return after the reset are active faults — the board re-tests fans and thermistors continuously. Note that after any reset the cabinet needs several hours to pull temperatures back down, so judge the result by whether the code returns, not by instant cooling.

Frequently asked questions

Related guides

Facts on this page were checked against manufacturer documentation: www.lg.com · www.lg.com · www.lg.com · www.lg.com · www.lg.com