Last updated: 2026-10-30 · By Fix It or Replace editorial team

LG Freezer Not Freezing? Settings, Lock, Demo Mode, Vents, Door Gasket, Back-Cover Dust, Frost, FF / dH / FS / CF / CH Codes, Evaporator Fan, Defrost Heater, Sensor, Board — Fixes, Costs, Repair vs Replace (2026)

Verdict at a glance

Safety check before any DIY (30 seconds)

Stop and don't start the DIY steps below if any of these is true:

• Food safety first. A manual defrost takes at least 8 hours with the doors open. Move food to a cooler or backup fridge first, as LG suggests.
• Unplug before vacuuming the back cover, and don't remove the cover (LG).
• Burning smell, sparking, or a tripped breaker. Leave it unplugged and call a pro.
• Codes LG says need service: dH / FdH / dHF, dS, FS (freezer sensor), rS, CF (if it persists), CH, and the cycle error. LG says there's no owner troubleshooting for most of these.
• Sealed system: a refrigerant leak or compressor is licensed work.
• Don't chip ice off the vents or fan with tools. Defrost instead.
• Still under warranty? LG covers parts and labor in year 1 and the sealed system longer (see below). Request service before you open panels.
• Recall check: search your model on the CPSC recall site before paying for a repair (see "Recalls" below).

If none of these apply, the free checks below are safe for most owners.

Fix order at a glance (cheapest first)

DIY tiers: Easy (no tools) · Moderate (unplugged, towels, time) · Advanced (freezer back panel off, multimeter) · Pro only (boards, sealed system, or still under warranty).

Which LG refrigerator do you have?

Find the model and serial number on the label inside the refrigerator. You need it for the right part, for codes, and for the warranty.

Prefixes are examples, not a full list. On some models the code shows as a pattern of lit temperature LEDs; LG's error-code list maps each pattern.

Five-minute checks before you call anyone

1. Display: OF F means Demo mode. A letter code (FF, dH, FS, CF, CH) means see the table below. A locked panel won't take changes until you long-press Lock.
2. Setting: −8°F or colder (LG's current article). Wait a day before you judge it.
3. Thermometer: put one between frozen packages overnight.
4. Vents: move anything pressed against the vents in the freezer.
5. Frost on the vents or back wall? That's the cue for LG's manual defrost.
6. Gasket: run a hand along it; push any loose section back into its groove.
7. Back cover: unplug, vacuum the dust, plug back in.

How to know it's fixed: 24–48 hours later the freezer holds your setting and ice cream is firm.

What LG says vs. what LG says (three LG pages that don't agree)

LG's own help pages give different numbers for the same problem:

Our take: start at about −8°F; going colder rarely fixes a fan or defrost problem. For an FF code or frost on the vents, defrost for at least 8 hours, and go the full 24 hours (longer in a cold room) if ice is still on the fan or vents when you check. If your panel shows FS, tell the technician whether the ice maker was overfilling; that separates a flow-sensor problem from a freezer-sensor problem.

Not from LG: Fixr, a cost-guide site, says to clean refrigerator coils at least twice a year. LG's advice is to vacuum the back cover (unplugged) and not remove it.

LG freezer codes and what they point to

Which part each symptom points at:

Codes and explanations from LG US help library pages (sources 1–4), checked 2026-10-30. The part mapping is our own from those pages and the LG part catalog on Sears PartsDirect.

Diagnose by symptom → likely part

1. FF code or a silent freezer fan

Likely cause: ice around the evaporator fan, or a failed fan motor. LG says to defrost first; if the code returns, the fan motor is the usual part.

DIY difficulty: Moderate (defrost) → Advanced (motor).

2. dH code, or frost on the vents that keeps coming back

Likely cause: the defrost system. LG lists ice buildup, a blown thermal fuse, heater failure, or a main board issue, and says the code appears when the expected temperature change doesn't happen after defrost starts.

DIY difficulty: Advanced; LG recommends service.

3. dS or FS code

Likely cause: a failed defrost sensor or freezer sensor. LG says these require a professional inspection.

DIY difficulty: Advanced.

4. CF code, or the back of the fridge is hot and quiet

Likely cause: the condenser fan motor at the rear, which releases heat from the compressor. LG says disconnected wiring or the main board can also cause CF.

DIY difficulty: Advanced.

5. Cold air leaking at the freezer drawer or door

Likely cause: a gasket out of its groove (press it back in) or torn. LG's error-code page also says frost along the freezer walls means the leveling and door alignment need checking.

DIY difficulty: Moderate.

Recalls

We searched the CPSC site on 2026-10-30. The LG refrigerator recall we found and read is from June 29, 2005: about 20,000 LG and Kenmore Elite Trio three-door bottom-freezer refrigerators, where the condenser fan motor capacitor could short and overheat (fire hazard). The LG models were LRFC21755TT/SB/ST and LRFC25750WW/SW/SB/TT/ST, serial numbers starting 405KR through 410KR; the remedy was a free in-home repair (LG 888-294-5782 at the time). It isn't a freezer-not-freezing recall, but if you own one of those models and it was never repaired, mention it. We didn't find a current LG recall for freezers that won't freeze. Search your exact model at cpsc.gov/Recalls.

Prevent it next time

• Don't overfill: LG suggests up to about 60%, with vents clear.
• Close doors fully and check the gasket sits in its groove.
• Vacuum the back cover now and then, unplugged; don't remove it.
• Leave 4 inches behind the fridge, and keep it in a 41–109°F room.
• Keep the fridge level with the doors aligned; LG links frost along the freezer walls to leveling and alignment.

Related guides: LG refrigerator not cooling · LG ice maker not working · LG refrigerator leaking water · GE freezer not freezing · Whirlpool freezer not freezing · Samsung fridge freezer not freezing · Samsung freezer frost buildup

What LG's warranty covers on a refrigerator

Per LG's US refrigerator limited warranty (see Sources; read via search-index text because the PDF blocked our fetch):

Coverage varies by model (some list longer sealed-system terms), so check the warranty sheet that came with yours. What this means for a freezer that won't freeze: an evaporator fan, defrost heater, sensor, condenser fan, or board in year 1 is covered. A CH or other sealed-system failure is covered with labor through year 5. Setting, Demo mode, overfilling, and dust aren't defects. Keep your proof of purchase.

→ LG: schedule a repair · LG Customer Service 1-800-243-0000

Before you pay for any repair: a 4-point check

1. Warranty: year 1; sealed system through year 5; inverter compressor part through year 10; retailer or credit-card extended protection.
2. Recalls: search your model at cpsc.gov/Recalls.
3. Free fixes done: setting, lock, Demo mode, 2–3 days for a new fridge, vents, gasket, space, back-cover dust, manual defrost.
4. Written quote: ask for part, labor, and trip fee separately, and which part tested bad.

What it costs: repair parts and pro service (2026)

Part prices checked 2026-10-30 on Sears PartsDirect public search pages (S1–S7). Pro-cost cells tagged [GUIDE] from G1 (Fixr) and G2 (HomeGuide), re-read 2026-10-30; [GUIDE] figures are national averages, not LG-specific quotes except where marked. Prices change; confirm with your model number.

Tip: tell the tech the exact code, whether you already did a manual defrost (and for how long), whether the fridge side is warm too, and whether the ice maker overfills. That separates a fan, defrost, sensor, and sealed-system problem.

Repair vs. replace calculator

1. What's the all-in repair cost? → R = trip/diagnostic fee + part + labor + tax, minus anything LG's warranty (or a recall) covers
2. What does a comparable new refrigerator cost, all-in? → N = unit + delivery + installation + haul-away
3. How old is your refrigerator, and how long should it last? → Age and Life (use about 13 years, Fixr's average, inside HomeGuide's 10–20-year range, if you don't know)
4. How much have you spent on repairs in the last 2 years? → Past

Step A — Cost ratio: R ÷ N
Step B — Life used: Age ÷ Life
Step C — Repeat-repair check: (R + Past) ÷ N

Repeat-repair rule: if Step C is over 50%, lean toward replacing. If the part is no longer available for your model, replace.

Worked example 1 (illustrative numbers): A 4-year-old LG French-door shows FF and the freezer is soft. You unplug it and leave the doors open overnight; the code clears and it's cold 2 days later. R = $0.
→ Not a repair.

Worked example 2 (illustrative numbers): A 7-year-old LG side-by-side shows dH. A tech replaces the defrost heater: R = $300; N = $2,000.
300 ÷ 2,000 = 15%; life used 7 ÷ 13 = 54% → Repair.

Worked example 3 (illustrative numbers): An 11-year-old LG bottom-freezer shows CH; the tech quotes a sealed-system repair after an evaporator fan last year ($250): R = $900; N = $1,600.
900 ÷ 1,600 = 56% (inside the 50–60% second-quote zone); life used 11 ÷ 13 = 85%; repeat check (900 + 250) ÷ 1,600 = 72% → Replace (unless an inverter-compressor part is still covered and the labor quote is low).

Tips toward replacing: a CH or sealed-system repair out of coverage on an older refrigerator, repeat failures, or parts no longer available.
Tips toward repairing: it's a fan, defrost heater, sensor, or gasket; the refrigerator is under about 8 years old; or it's covered.

Why 50%? It's the common rule of thumb; Fixr says never spend more than half the price of a new model on repairs. Some technician checklists draw the line a little higher, at about 60% of a new refrigerator's price, so treat a repair that costs 50–60% of new as a second-quote zone, not an automatic replace.

Who services LG refrigerators near you

1. LG (warranty). Schedule a repair online or call 1-800-243-0000. Have your model and serial number ready.
→ LG: schedule a repair

2. A partner appliance pro (out of warranty).
Our call line connects you with an independent appliance repair provider in your area. Tell them the code, the freezer temperature, what you've already tried, and your model number.

Questions to ask any technician:

• Did you check for ice on the evaporator fan before replacing it?
• For dH: did you test the heater, the thermal fuse, and the board?
• If it's the sealed system, is it still inside LG's coverage, and is the compressor part covered longer?
• Can you split the quote into part, labor, and trip fee?

Optional: is an appliance warranty worth it?

A home warranty (service contract) can cover repairs for a yearly fee plus a per-visit service fee. Read the exclusions carefully: plans often exclude food loss, refrigerant recharges, and pre-existing problems.

FAQ

Why is my LG freezer not freezing?
LG's top checks: setting too warm, a locked panel, Demo mode (OF F), a new fridge that hasn't had 2–3 days, blocked vents, a loose gasket, too little space behind it, or dust on the back cover. FF often means ice on the fan.

What temperature should my LG freezer be?
LG's current article says to set −8°F or colder (−8 to −11°F) if it isn't cold enough; its FAQ lists 0 to −4°F as the normal recommendation.

How do I fix FF on my LG freezer?
LG says to unplug it and leave both doors open for at least 8 hours (its ER FF article says at least 24 hours, up to 3 days in winter), dry everything, plug it back in, and allow 24–48 hours. If FF returns, request service.

What does dH mean on an LG refrigerator?
A defrost fault: ice buildup, a blown thermal fuse, heater failure, or a main board issue. LG says to request service.

How much does it cost to fix an LG freezer that won't freeze?
Often nothing. When we checked Sears PartsDirect on 2026-10-30, LG evaporator fan motors were listed at about $33 to $221 and defrost heaters at about $93 to $191. Fixr puts freezer diagnosis and repair at $100 to $250.

Should I replace an LG refrigerator whose freezer won't freeze?
Rarely for a fan, heater, sensor, or gasket. Consider it for a CH or sealed-system repair on an older model that's out of coverage.

About the author

Fix It or Replace editorial team — We research appliance repairs using manufacturer documentation, parts-supplier data, and current US cost guides, and we cite every source below. We are not appliance technicians; for sealed-system, electrical, or board repairs, call a qualified pro.
Last updated: 2026-10-30.

Sources

1. LG US help library: "If Your LG Freezer Is Not Cold Enough" (dated 09/30/2026: set −8°F or colder, −8 to −11°F; blocked vents; doors closed; 4 inches from the wall; room 41–109°F; vacuum the back cover unplugged, don't remove it; new fridge cold air in 1–2 hours, 2–3 days to normal; FAQ recommended 0 to −4°F, −6 to −11°F if not cold or room hot). https://www.lg.com/us/support/help-library/if-your-lg-freezer-is-not-cold-enough--20155482757821 (accessed 2026-10-30 via search-index text)
2. LG US help library: "[LG Refrigerator] Freezer Not Cold Enough (Weak Cooling)" (dated 02/02/2026: −22 to −24°C; long-press Lock to unlock; error code means service; doors and gasket pressed into its groove; back-cover dust can overheat the compressor; fill up to 60%; frost on vents: unplug, doors open at least 8 hours, 24–48 hours to recover). https://www.lg.com/us/support/help-library/lg-refrigerator-freezer-not-cold-enough--20155014481733 (accessed 2026-10-30 via search-index text)
3. LG US help library: "LG Refrigerator – Error Code List" (dated 09/03/2026: FS freezer sensor; dS freezer defrost sensor; dH/FdH/dHF defrost fault from ice buildup, blown thermal fuse, heater failure, or PCB; FF freezer fan or ice, doors open at least 8 hours, 24–48 hours; CF condenser fan, wiring, or main board; cycle error; CH high-side cycle leakage, likely refrigerant leak from the condenser, unplug 2 minutes; Demo mode OF F, hold REFRIGERATOR and ICE PLUS 5 seconds; FS flow sensor for ice-maker overfilling; frost along freezer walls means check leveling and door alignment). https://www.lg.com/us/support/help-library/lg-refrigerator-error-code-list--20155159406537 (accessed 2026-10-30)
4. LG US help library: "How to Fix ER FF and ER rF Error Codes on Your LG Refrigerator" (fan motor iced; unplug, doors open at least 24 hours, about 1 day in summer and up to 3 days in winter; dry; 24–48 hours). https://www.lg.com/us/support/help-library/how-to-fix-er-ff-and-er-rf-error-codes-on-your-lg-refrigerator--20155433198922 · "Freezing is weak due to foreign matter clogged at the back of the refrigerator" https://www.lg.com/us/support/help-library/lg-refrigerator-freezing-freezing-is-weak-due-to-foreign-matter-clogged-at-the-back-of-the-refrigerator--20154629491525 (accessed 2026-10-30 via search-index text)
5. LG US refrigerator limited warranty (1 year parts and labor; sealed system and compressor 5 years parts and labor; linear/inverter compressor part only years 6–10; terms vary by model). https://www.lg.com/us/PDF/warranty/ha/Warranty_REF.pdf (accessed 2026-10-30 via search-index text; direct fetch was blocked) · LG repair scheduling https://www.lg.com/us/support/repair-service/schedule-repair
6. U.S. Consumer Product Safety Commission: "CPSC, LG Electronics and Sears, Roebuck and Co. Announce Recall to Repair Refrigerators" (June 29, 2005; about 20,000 units; condenser fan motor capacitor can short and overheat; LG LRFC21755TT/SB/ST and LRFC25750WW/SW/SB/TT/ST; serials 405KR–410KR; free in-home repair; LG 888-294-5782). https://www.cpsc.gov/Recalls/2005/cpsc-lg-electronics-and-sears-roebuck-and-co-announce-recall-to-repair-refrigerators · recalls search https://www.cpsc.gov/Recalls (accessed 2026-10-30)
7. Federal Trade Commission: endorsement and affiliate disclosure guidance. https://www.ftc.gov/business-guidance/resources/ftcs-endorsement-guides-what-people-are-asking
8. Part prices (Sears PartsDirect, S-list) and repair cost guides (Fixr G1, HomeGuide G2), see lists below (accessed 2026-10-30).

Part price sources (Sears PartsDirect public search results, USD, accessed 2026-10-30; LG part numbers only; prices change, confirm with your model number):

• S1. Search "lg refrigerator evaporator fan motor" (plus "lg refrigerator damper"): EAU64824401 assembly $33.25, EAU61524007 $79.29, EAU65058305 $85.98, EAU63923608 $100.50, EAU63923603 $103.69, EAU63103003 $103.70, EAU63103201 $103.70, EAU60694527 $109.53, EAU65058315 $121.56, 4681JB1027C $121.80, 4681JB1029H $131.06, 4681JB1027N $220.95 (condenser fan EAU62025701 in the same results excluded). https://www.searspartsdirect.com/search?q=lg%20refrigerator%20evaporator%20fan%20motor
• S2. Search "lg refrigerator defrost heater": 5300JR1006D $93.03, MEE62705114 $93.03, MEE62805106 $105.24, MEE63545701 $106.24, 5300JK1005D $109.38, MEE63545705 $109.53, MEE62225101 $109.53, MEE62225112 $109.53, 5300JB1114Z $114.92, MEE62805303 $129.20, MEE63545708 $136.58, 5300JK1003M $150.55, 5300JB1100T $163.14, MEE64165101 $189.64, MEE62105217 $191.17 (Kenmore-labeled MEE62105206 and 5300JK1005Z, evaporator assembly ADL74581702, and GE WR51X10132 excluded). https://www.searspartsdirect.com/search?q=lg%20refrigerator%20defrost%20heater
• S3. Search "lg refrigerator defrost sensor": 6615JB2005H $30.67, EBD61246710 $33.00, 6615JB2005N $36.88, ACM73919214 freezer temperature sensor $45.89, ACM73079207 $48.72, 6615JB2005R $54.83, ACM73919216 $66.91, 6615JB2005W $93.03, 4781JR2004C $96.32, ACM55859001 $103.70, 6615JB2005U $115.92 (Samsung DA32-00006S, GE WR55X29875, and 808137001 excluded). https://www.searspartsdirect.com/search?q=lg%20refrigerator%20defrost%20sensor
• S4. Search "lg refrigerator condenser fan motor": 4680JB1017Q $82.69, EAU65058502 $86.35, 4680JB1026H $89.38, EAU63923601 $93.03, EAU65058312 $99.20, EAU63923602 $100.50, EAU63103205 $103.70, EAU63103207 $115.31, EAU62025701 assembly $123.86, EAU63103305 $135.38, EAU61644105 $172.17 (4681JB1029V listed at $17.96 left out of the range as a likely outlier; evaporator fan EAU65058313 and bracket MEA42772903 excluded). https://www.searspartsdirect.com/search?q=lg%20refrigerator%20condenser%20fan%20motor
• S5. Search "lg refrigerator door gasket": freezer door gasket, upper ADX73730401 $70.24; all door gaskets from ADX73591403 $67.52 to 4987JJ1010R $469.61. https://www.searspartsdirect.com/search?q=lg%20refrigerator%20door%20gasket
• S6. Search "lg refrigerator main pcb": EBR76347624 $213.01, CSP30242916 $258.81, CSP30021025 $365.76, EBR84433504 $383.91, CSP30021035 $383.91, EBR41531314 $385.45, EBR75234710 $402.07, EBR73093619 $428.79, EBR81182703 $447.90, EBR58010501 power board $455.29, EBR75234709 $481.79, EBR77042524 $481.79, CSP30020822 $481.79 (Kenmore Elite 6871JB1215J and Samsung DA92/DA94 boards excluded). https://www.searspartsdirect.com/search?q=lg%20refrigerator%20main%20pcb
• S7. Search "lg refrigerator compressor": TCA35931726 $280.93, TCA36811409 $430.63, TCA35776411 $441.53, TCA37091209 $467.32, TCA36491304 $476.29, TCA38151706 $487.47, TCA35111303 $508.72, TCA36811415 $523.31, TCA38091801 $616.58, TCA35893203 $720.42. https://www.searspartsdirect.com/search?q=lg%20refrigerator%20compressor

Pro-cost guide sources [GUIDE] (US national averages, parts + labor, not brand-specific quotes unless noted; the guide pages carry 2023–2025 dates, so local quotes may differ):

• G1. Fixr, "How much does it cost to repair a refrigerator?" (updated August 29, 2025): freezer diagnosis and repair $100–$250; fan repair $120–$200, replacement $120–$150; fridge seal $60–$100; control board $500–$1,000; compressor $500–$1,000; sealed system $800–$1,200; LG brand repairs $50–$400; service call $70–$120; labor $100–$250 per hour; replacement $1,000–$3,000; average life 13 years; clean coils at least twice a year (non-OEM advice); never spend more than half the price of a new model on repairs. https://www.fixr.com/costs/refrigerator-repair (accessed 2026-10-30)
• G2. HomeGuide, "How Much Does Refrigerator Repair Cost? (2026)" (byline April 5, 2023): freezer $100–$400; evaporator fan motor $250–$400; condenser fan motor $200–$350; defrost heater $120–$400; door seal $100–$300; control board $400–$750; compressor $700–$1,250; entire sealed system $600–$1,400; $50–$125 per hour, minimum call-out $70–$130; replacement $675–$2,500; refrigerators last 10–20 years. https://homeguide.com/costs/refrigerator-repair-cost (accessed 2026-10-30)

Disclosure

Fix It or Replace is an independent site. We are not affiliated with, endorsed by, or sponsored by LG. "LG" is a trademark of its owner and is used here only to describe the products we cover.

• Affiliate links: Some part links go to retailers such as PartSelect and RepairClinic. If you buy through them, we may earn a commission at no extra cost to you.
• Call line: Phone numbers labeled "partner pro" are operated by a third-party lead service that routes your call to an independent repair provider in your area. We may be paid for calls. We don't employ the technicians, and we don't guarantee their work, pricing, or availability. Confirm licensing, insurance, and quotes directly with the provider.
• Prices are estimates and change often. Always get a written quote.
• Safety: Unplug the refrigerator before vacuuming the back cover or removing panels. Sealed-system work requires a certified technician. If you're unsure, call a qualified professional.

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