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LG · Room air conditioner

LG Room air conditioner FL Code: Meaning & Troubleshooting

Stop use and isolate nowProfessional service requiredSafe checks available

error code

LG FL is a model-dependent alternate display for the CH04 condensate condition on covered window or portable air conditioners.

First thing to do

Power off and unplug the air conditioner before using its documented lower rear drain port.

Can I keep using it? Use only the accessible drain port documented for window and portable units; do not open the cabinet.

DIY level: Stop — professional guidance required

See the stop instructions

Interactive troubleshooter

Follow the official checks one at a time. A code and your answers do not confirm a failed part.

Model number (optional)

Brand / appliance verified. Exact model not checked.

Scope: LG window and portable air conditioners whose model or software shows FL for CH04. Model stays in this tab; it is excluded from analytics.

Stop — professional guidance recommended

Power off and unplug the air conditioner before using its documented lower rear drain port.

Use only the accessible drain port documented for window and portable units; do not open the cabinet.

Request LG inspection if FL occurs frequently even on dry days.

LG FL is a model-dependent alternate display for the CH04 condensate condition on covered window or portable air conditioners. The source does not establish which component has failed from these answers. Do not continue into electrical testing, gas work, wiring, or disassembly.

Give support the model, displayed code, and checks listed below. Check warranty coverage before paying for service. A written quote lets you compare repair with replacement.

Repair or Replace?

Your check history

No checks completed yet.

Safe external checks

Power off and unplug the unit, drain the documented external condensate port, and securely replace its cap.

  1. Drain condensate through the documented external port and securely replace the cap.

Stop use and isolate now

If you notice smoke, a burning smell, sparks, flooding, gas odor, severe overheating, or electric-shock risk, stop using the appliance and follow the manufacturer's safety instructions. Do not wait for this page or email support.

Power off / keep off

The source directs power off or keeping the appliance off.

Request LG inspection if FL occurs frequently even on dry days.

  • Request LG inspection if FL occurs frequently even on dry days.

Official meaning, scoped to this source

LG FL is a model-dependent alternate display for the CH04 condensate condition on covered window or portable air conditioners.

Manufacturer
LG
Document
[LG Air Conditioner] Guide to Error Codes · Official error-code index
Product family
window and portable air conditioners
Market and locale
US · en-US

This is an official-source interpretation for the stated scope, not a confirmed diagnosis. Meaning can change across brands, models, product families, and markets.

Market, product family, and model applicability

US · en-US · LG window and portable air conditioners whose model or software shows FL for CH04

Exact model applicability has not been verified.

This release retains family or source-index scope only. Do not infer that an arbitrary model uses this code; confirm it in the exact manufacturer manual.

Open the official model/manual lookup (opens in a new tab)

Do not do

Do not access internal drains, wiring, refrigerant, fans, or sealed-system components.

Use only the accessible drain port documented for window and portable units; do not open the cabinet.

Check warranty before authorizing service

Warranty coverage depends on the country, model, purchase date, and manufacturer terms. Have the model and serial number available, open the manufacturer's official support or warranty page, and ask whether the service route is authorized before paying for work.

This public record does not make a coverage determination. Use the official model lookup and warranty information linked below.

Open official model lookup (opens in a new tab)↗View source and warranty links

If the message returns

If FL returns frequently in dry conditions, request LG inspection.

Source and scope

Official source verified at release
Market and locale
US · en-US
Product family
window and portable air conditioners
Content and safety verified on
July 26, 2026
Source updated by manufacturer
Not supplied in the official record

LG

[LG Air Conditioner] Guide to Error Codes · Official error-code index

Open official source (opens in a new tab)

Verification and review status

  • Content meaning and safety verifiedJuly 26, 2026
  • Source reachability statusOfficial source verified at release
  • Automated evidence review completedPassed · July 26, 2026
  • Automated safety rules checkPassed for this published safety boundary
  • Human technical reviewPending — no human completion is claimed
  • Publication gateAutomated publication checks passed · July 26, 2026
  • Official-source conflictNo unresolved conflict admitted to this public release

Automated checks and release approval are not a substitute for a qualified service professional or the exact manufacturer manual.

Evidence used for this guidance

  • CH04 / FL > Window type, Portable type

    Source-backed summary

    Depending on model and software, CH04 may appear as FL; drain condensate, and request inspection if it occurs frequently on dry days.

Does the model or source look wrong?

Send a privacy-minimal correction signal. It cannot change public content automatically.

Report a model or source mismatch

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