The LG refrigerator CH error code typically indicates a problem within the sealed refrigeration system, most commonly a high-side refrigerant leak. However, it’s crucial to understand that this code can also be triggered by other issues, such as a faulty defrost sensor.
This guide will help you understand the potential causes, troubleshooting steps, and how to clear the code.
Primary cause of the LG refrigerator CH error code: Sealed System High Side Leak
A high-side leak means refrigerant is escaping from the high-pressure side of the sealed system. This can be caused by various factors, including:
- Leaks in the tubing or connections: This is the most common cause.
- A faulty compressor: A failing compressor can lead to increased pressure and leaks.
- A malfunctioning valve: A bad valve can also disrupt the refrigerant flow and cause leaks.
Troubleshooting a High Side Leak:
- Check Temperatures: You can use a temperature gun to check temperatures. In a high-side leak, both the low-side and high-side pressures will be lower than normal and will generally follow each other. For example, you might see readings like 25 inHg on the low side and 45 PSIG on the high side.
- Isolate and Pressurize: To effectively locate a leak, isolate the sealed system and pressurize it with nitrogen to between 300-400 PSIG.
- Leak Detection: Use soap bubbles, carefully feel for escaping air, or listen for hissing sounds to pinpoint the leak’s location.
Important Note on Yoder Loops: LG refrigerators manufactured recently have a rubberized shrink coating at the bottom of the Yoder Loop to prevent rust. Reports of rusted Yoder Loops are currently rare. However, repair procedures for leaks between compartments are available if needed.
Other Potential Causes of the LG Refrigerator CH Error Code:
While a high-side leak is the most common culprit, the “CH” error can also be triggered by:
- Faulty Defrost Sensor: A malfunctioning defrost sensor can sometimes falsely trigger the “CH” code. Check the frost pattern on the evaporator coil(s). If there’s excessive frost buildup indicating a defrost problem, test the defrost sensor(s). The freezer defrost sensor has been specifically identified as a potential source of false “CH” codes.
- Dirty Condenser Coil: A clogged condenser coil restricts airflow and reduces cooling efficiency, potentially leading to a “CH” error. Inspect the condenser coil and clean it if necessary.
Clearing the LG Refrigerator CH Error Code:
The “CH” code should automatically clear itself after 24 hours if the refrigerator successfully reaches and maintains a temperature of 14°F or below after the repair.
If the code doesn’t clear after 24 hours and the temperature is consistently below 14°F, you can force it off using the following procedure:
- Open the refrigerator door.
- Press the Freezer and Refrigerator buttons simultaneously three times.
This forced deletion procedure is intended for situations where the temperature is normal after repair, but the error code remains due to a software glitch or other issue.
LG Refrigerator CH Error Code: Summary Table
| Cause | Symptoms/Diagnosis | Solution | Clearing the Code |
|---|---|---|---|
| High Side Refrigerant Leak | Low and following pressures on both low and high sides. Use SVC App or temperature gun. | Isolate the system, pressurize with nitrogen (300-400 PSIG), locate the leak (soap bubbles, feel, listen), and repair the leak. | Should clear after 24 hours if temperature reaches and maintains 14°F or below. Force clear: Open the door and press the Freezer and Refrigerator buttons 3 times. |
| Faulty Defrost Sensor | Excessive frost buildup on evaporator coil(s). | Test and replace the faulty defrost sensor. | Same as above. |
| Dirty Condenser Coil | Reduced cooling efficiency, potentially warm refrigerator. | Clean the condenser coil. | Same as above. |
| Code Remains After Successful Repair | Temperature is normal (below 14°F), but the “CH” code persists. Likely a software or algorithm issue. | Force clear: Open the door and press the Freezer and Refrigerator buttons 3 times. |
Mike Walker is an appliance repair technician with 15 years of experience dedicated to helping homeowners understand and fix their appliances. On this site, I break down complex error codes and offer easy-to-follow troubleshooting solutions.
