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lg | air-conditioner – Compression Ratio Exceeded
Error Codes (undefined): Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH37 Mean?❓

CH37 means that the compressor is working under extreme pressure conditions — either due to blockage in the refrigerant cycle, overcharging, or sensor failure. This causes an unsafe compression ratio, triggering a safety shutdown to prevent damage.

air-conditioner - Causes of CH37 Error

  • Refrigerant overcharge or incorrect type used
  • Clogged expansion valve or capillary tube
  • Blocked refrigerant filter or pipes
  • Faulty high or low pressure sensor
  • Restricted airflow over indoor or outdoor coils

air-conditioner - How to Fix CH37 Error❓

  • Check Refrigerant Levels

    1. Use proper gauges to check refrigerant pressure.
    2. Recover or recharge refrigerant as per manufacturer specs.

  • Inspect for Blockages

    1. Check expansion valves, filters, and pipes for clogs.
    2. Clean or replace components as needed.

  • Verify Pressure Sensors

    1. Use multimeter or diagnostic tools to test pressure sensors.
    2. Replace any faulty sensors.

  • Improve Airflow

    1. Clean coils, filters, and ensure proper fan operation.
    2. Clear any obstructions around outdoor unit.

  • Test Post-Repair

    1. Monitor system after fix to ensure pressure levels are normal.

air-conditioner - Helpful Tips

  • Do not continue using the AC with this error—it may harm the compressor.
  • Always get refrigerant handled by certified technicians.
  • Clean filters and coils regularly to reduce strain.
  • Avoid setting temperatures extremely low in very hot weather.
  • Schedule preventive maintenance before peak seasons.

Frequently Asked Questions❓

Question: Can I fix CH37 error by restarting the AC?
Answer: Temporarily, maybe. But the root issue must be diagnosed and fixed.
Question: Does CH37 damage the AC?
Answer: If ignored, it can cause compressor failure or refrigerant system damage.
Question: Is this a common error in LG inverter ACs?
Answer: It’s not common, but can occur due to refrigerant handling issues or airflow blockages.

When to Contact a Technician

If you experience any of the following issues even after completing the recommended troubleshooting steps, please contact an authorized service technician or our support team for further assistance.

  • The same error appears repeatedly after restarting or resetting the unit.
  • Multiple error codes appear simultaneously.
  • The device makes unusual noises, vibrations, or emits a burning smell.
  • The product fails to start, operate, or complete its function despite troubleshooting.
  • There are signs of electrical issues, physical damage, or leakage.
  • An unknown or unlisted error code appears on the display.

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