LG · Room air conditioner
LG Room air conditioner CH04 Code: Meaning & Troubleshooting
Stop use and isolate nowProfessional service requiredSafe checks availableerror code
LG CH04 means a covered window or portable air conditioner has accumulated condensate that needs to be drained.
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 instructionsInteractive 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 covered by the cited US guide. 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 CH04 occurs frequently even on dry days.
LG CH04 means a covered window or portable air conditioner has accumulated condensate that needs to be drained. 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.
- 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.
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)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.
If the message returns
If CH04 returns frequently in dry conditions, request LG inspection.
Explore the same symptom
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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