LG AC Error Code CH38: Causes, Fixes, and How to Reset Your Air Conditioner

What Does LG AC Error Code CH38 Mean?

If your LG air conditioner displays error code CH38, it usually means the system has detected a refrigerant level problem. This code appears when the AC senses that the refrigerant pressure is lower than normal.

Refrigerant is the gas responsible for cooling the air inside your room. When the level drops too low, the compressor can overheat or get damaged. To protect the system, the air conditioner automatically stops and shows CH38 on the display.

This error is commonly seen in LG inverter air conditioners and split AC models.

Common Causes of LG AC Error Code CH38

Several issues can trigger the CH38 error. The most common ones include:

1. Low Refrigerant Level

The most frequent cause of CH38 is insufficient refrigerant gas in the system.

This can happen because of:

• Small leaks in copper pipes

• Poor installation

• Loose flare connections

2. Refrigerant Leakage

Over time, refrigerant may escape due to corrosion, damaged pipes, or worn joints. Even a small leak can trigger this error.

3. Compressor Protection Mode

The AC’s internal system may temporarily shut down the compressor if it detects abnormal pressure levels. This safety feature prevents permanent damage.

4. Sensor or Pressure Detection Issue

In rare cases, the pressure sensor or control board may incorrectly detect refrigerant levels and show the CH38 code.

How to Fix LG AC Error Code CH38

You can try a few basic troubleshooting steps before calling a technician.

Step 1: Turn Off the AC

Switch off the AC using the remote and turn off the main power supply.

Step 2: Wait for 10–15 Minutes

Allow the system to reset. Sometimes the error occurs due to temporary pressure fluctuations.

Step 3: Restart the AC

Turn the power back on and start the AC again.

If the error disappears, it was likely a temporary system protection response.

When to Call a Technician

If the CH38 error keeps appearing, professional inspection is required.

A technician may:

• Check refrigerant pressure

• Locate refrigerant leaks

• Recharge refrigerant gas

• Inspect compressor operation

• Test pressure sensors and PCB board

Refrigerant handling requires proper equipment, so it should not be attempted without training.

How to Prevent CH38 Error in the Future

Proper maintenance can reduce the chances of seeing this error again.

Follow these tips:

• Service your AC at least once a year

• Ensure proper installation and tight pipe connections

• Clean filters regularly

• Check for unusual cooling performance early

Routine servicing helps detect refrigerant leaks before they become serious.

Final Thoughts

The LG AC error code CH38 is mainly related to low refrigerant levels or compressor protection. While a simple restart may clear the error temporarily, repeated occurrences usually indicate a refrigerant leak that requires professional repair.

Addressing the issue quickly prevents damage to the compressor and ensures your air conditioner continues to cool efficiently.

Read More:

LG AC error code CH05

LG AC error code CH67

LG AC error code CH21

LG AC error code CH10