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LG Air Conditioners CH Error Code: How to Fix It Yourself

The CH Error Code on your LG Air Conditioner is a diagnostic alert indicating a specific malfunction. In most cases, this error can be resolved with some basic troubleshooting steps that don't require professional help or expensive parts.

Easy20-45 minutesParts: $0-$25

Tools Needed

Fin combVacuum with brush attachmentGarden hosePhillips screwdriver

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⚠️ Safety First

  • Turn off the air conditioner and unplug it before any maintenance.
  • Be careful around the aluminum fins — they are sharp and bend easily.
  • Never attempt to recharge refrigerant yourself — this requires a licensed technician.

Before You Start

Parts You May Need

LG Air Conditioner Replacement Parts

~$10-$30

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Step-by-Step Repair

  1. Step 1 of 6
    1

    Power cycle the unit

    Unplug your LG Air Conditioner from the wall outlet. Wait 2-3 minutes. This resets the internal computer and clears temporary error codes. Plug it back in and see if the error returns.

  2. Step 2 of 6
    2

    Check for obvious issues

    Look for anything unusual — blocked vents, loose connections, water where it shouldn't be, or unusual sounds. Many error codes are triggered by simple physical problems that are easy to spot.

  3. Step 3 of 6
    3

    Clean filters and accessible parts

    If your air conditioner has user-accessible filters, remove and clean them thoroughly. Clogged filters trigger many error codes. Rinse under running water and let dry completely before reinstalling.

  4. Step 4 of 6
    4

    Inspect connections and hoses

    Check all hoses, cables, and connections you can safely access. Look for kinks, clogs, loose fittings, or visible damage. Reconnect anything that looks loose.

  5. Step 5 of 6
    5

    Run a test cycle

    After cleaning and checking connections, run a short test cycle. If the error code has cleared, you've fixed the problem. If it returns, try repeating the power cycle one more time.

  6. Step 6 of 6
    6

    Document the error for a technician

    If the error persists, note exactly when it appears (start of cycle, mid-cycle, etc.) and any sounds or behaviors. This information helps a technician diagnose the issue much faster, saving you money on diagnostic fees.

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If That Didn't Work

  • A dirty air filter is the #1 cause of AC problems — clean or replace it first.
  • The condenser coils may be dirty — clean them with a garden hose.
  • The thermostat may not be set correctly or the sensor may be displaced.

When to Call a Professional

If the compressor isn't running or you suspect a refrigerant leak, you'll need a licensed HVAC technician. Refrigerant recharge costs $150-$400. Compressor replacement on a window unit usually isn't worth it — a new unit costs $150-$500.

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Disclaimer: This guide is for informational and educational purposes only and does not constitute professional repair advice. All repairs are performed at your own risk. RepairItFree.com is not liable for any personal injury, property damage, device damage, voided warranties, or other losses resulting from the use of this information.

If you are unsure about any step — especially anything involving electricity, gas, water, or refrigerant — stop and consult a qualified professional. Your safety is more important than saving money.

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