mypros+
Error code reference

LG Refrigerator Error Code HI

Ambient temperature is above 50°C, displayed on outside temperature area of LCD.

LG codesLG refrigerator codes

Ambient temperature is above 50°C, displayed on outside temperature area of LCD.

MyPros+ Max

Get the full diagnostic procedure for HI.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What HI means on a LG refrigerator

The HI error code on an LG refrigerator indicates that the ambient temperature surrounding the unit has exceeded 50 degrees Celsius (122 degrees Fahrenheit). This reading is displayed in the outside temperature area of the LCD panel. The code is generated by the refrigerator's temperature sensing system, which monitors environmental conditions around the appliance. When the detected ambient temperature breaches this upper threshold, the unit triggers the HI alert to notify the user that operating conditions are outside the acceptable range.

This code is not necessarily a sign of a refrigerator component failure. Instead, it most commonly reflects an actual environmental problem: the space where the refrigerator is installed has become dangerously hot. Conditions like direct sunlight exposure, placement near heat-generating appliances, poor ventilation in an enclosed space, or an unusually hot garage or utility room can all push ambient temperatures above the 50 degree Celsius limit. In rare cases, a faulty ambient temperature sensor could generate a false HI reading even when actual surrounding temperatures are normal.

When the HI code is active, the refrigerator's ability to maintain safe internal cooling temperatures may be compromised. Compressor efficiency drops significantly in extreme ambient heat, and the unit will work harder to maintain set temperatures, potentially leading to food safety concerns. Resolving the root cause of the elevated ambient temperature is the primary corrective action before any internal refrigerator components are inspected.

Source: manufacturer service documentation.

Common causes of HI

  1. 01

    Excessively hot installation environment

    Wiring / connection

    The most frequent cause is the refrigerator being located in a space that genuinely reaches or exceeds 50 degrees Celsius, such as an uninsulated garage during summer or a room with no ventilation. Check the actual room temperature with a thermometer to confirm.

  2. 02

    Insufficient clearance around the refrigerator

    Wiring / connection

    If the unit is installed too close to walls or enclosed in a tight cabinet without adequate airflow, heat generated by the condenser can build up and raise the detected ambient temperature. Check that the recommended clearance space on all sides of the unit is maintained.

  3. 03

    Proximity to heat sources

    Wiring / connection

    Placement next to ovens, ranges, dishwashers, direct sunlight from windows, or heating vents can dramatically increase the local ambient temperature around the refrigerator. Relocating or shielding the unit from these heat sources should resolve the error.

  4. 04

    Faulty ambient temperature sensor

    Part replacement

    If the surrounding environment is clearly not excessively hot but the HI code persists, the ambient temperature sensor itself may be defective and sending an inaccurate high-temperature reading to the control board. This would require testing and replacing the sensor.

  5. 05

    Control board misreading sensor data

    Part replacement

    In rare cases, the main control board may be incorrectly interpreting input from a functioning ambient sensor and falsely triggering the HI alert. This is typically diagnosed only after confirming the sensor itself tests correctly.

See the test procedure for each cause

Frequently asked questions about HI

What does HI mean on a LG refrigerator?
The HI code on an LG refrigerator means the ambient temperature around the outside of the unit has been detected at above 50 degrees Celsius (122 degrees Fahrenheit). This reading appears in the outside temperature area of the LCD display. It is primarily an environmental alert rather than an internal component failure. Addressing the temperature of the room or space where the refrigerator is located is the first step.
How do I fix the HI error code on my LG refrigerator?
Start by checking the actual temperature of the room or space where the refrigerator is installed using a thermometer. If the space is genuinely very hot, improve ventilation, remove nearby heat sources, or relocate the refrigerator to a cooler area. If the environment is not excessively hot, the ambient temperature sensor may be faulty and should be tested and replaced if defective.
Is the HI error code on my LG refrigerator dangerous?
The HI code itself is a warning, not an immediate emergency, but the underlying cause can be serious. When ambient temperatures exceed 50 degrees Celsius, the refrigerator cannot cool efficiently, which means food inside may not stay at safe temperatures. Address the environmental conditions promptly to prevent food spoilage and avoid long-term strain on the compressor and other components.
Will resetting my LG refrigerator clear the HI error code?
A simple power reset will temporarily clear the HI display, but the code will return if the ambient temperature around the unit remains above 50 degrees Celsius. The reset does not resolve the underlying condition. The error will only stay cleared once the environment around the refrigerator is brought within an acceptable temperature range, or the faulty sensor is replaced if that is the cause.
How much does it cost to repair a LG refrigerator showing the HI code?
If the error is due to an environmental issue like a hot room or poor ventilation, there is no parts cost involved. If the ambient temperature sensor is faulty, sensor replacement parts typically range from around 15 dollars to 60 dollars depending on the specific model, with professional labor adding another 80 to 150 dollars if a technician is needed. Control board replacement, if required, is more costly and generally falls in the range of 150 to 400 dollars for parts alone.

Related LG refrigerator codes

All LG refrigerator codes
View all 485 LG refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass