Appliance Code Check

LG · Room air conditioner

CH04

Stop use and isolate nowProfessional service requiredSafe checks available

error code

LG CH04 means a covered window or portable air conditioner has accumulated condensate that needs to be drained.

Display form
CH04
Lookup normalization
CH04
Alternate forms
None retained in the official record

Check the display exactly as shown. The decoder ignores case and spaces, but it never substitutes O/0, I/1, or S/5.

Official meaning, scoped to this source

LG CH04 means a covered window or portable air conditioner has accumulated condensate that needs to be drained.

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 covered by the cited US guide

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)

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 CH04 occurs frequently even on dry days.

  • Request LG inspection if CH04 occurs frequently even on dry days.

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 CH04 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

    High humidity can cause CH04 or FL; drain condensate from the lower rear drain port, and request inspection if it occurs frequently on dry days.

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