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Error code reference

LG Refrigerator Error Code E 24

Freezer defrost error

LG codesLG refrigerator codes

Freezer defrost error - defrost trouble due to overheating (RSG5B* model display).

First step from the service manual

Disconnect MAIN PCB CN70 and read resistance between Orange and Brown wire terminals; 0 Ohm = heater short, infinite Ohm = wire cut or blown thermistor.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E 24 means on a LG refrigerator

The E 24 error code on LG RSG5B* series refrigerators signals a freezer defrost fault caused specifically by overheating during the defrost cycle. Under normal operation, the defrost heater activates periodically to melt frost accumulation on the evaporator coils, and a defrost thermistor monitors coil and heater temperatures to prevent the system from exceeding safe limits. When the control logic detects that temperatures have climbed beyond acceptable thresholds during this cycle, it logs E 24 and halts the defrost process to protect the evaporator assembly and surrounding components.

The primary diagnostic focus for E 24 is the defrost heater circuit itself. The main PCB connector CN70 carries the heater circuit through Orange and Brown wires, and resistance measurement across those terminals reveals the fault type immediately. A reading of 0 Ohms indicates a shorted heater element, meaning the heating coil has failed in a way that allows unrestricted current flow, which produces excessive heat. An infinite resistance reading points in the opposite direction, indicating an open circuit caused by a severed wire, a corroded connector, or a blown defrost thermistor that has opened to cut power as a protective response.

Beyond the heater and thermistor, contributing factors can include a defrost thermostat that fails to open at the correct cutoff temperature, poor airflow around the evaporator causing heat to concentrate, or a faulty main PCB that misreads sensor signals. Because the error specifically cites overheating rather than a simple no-heat condition, attention should be given to the thermal limiting components in the circuit, particularly the defrost thermistor and thermostat, after the heater element resistance has been confirmed normal.

Source: manufacturer service documentation.

Common causes of E 24

  1. 01

    Shorted defrost heater element

    Part replacement

    A short circuit within the heater coil allows excessive current to flow, generating abnormal heat levels. This is confirmed when resistance across the CN70 Orange and Brown wire terminals reads 0 Ohms.

  2. 02

    Open circuit from a blown defrost thermistor

    Part replacement

    The defrost thermistor can blow open as a protective response to overheating, cutting the circuit. An infinite resistance reading at CN70 with no visible wire damage points to this component.

  3. 03

    Severed or corroded wiring in the defrost circuit

    Wiring / connection

    A broken wire or heavily corroded connector in the harness between CN70 and the heater assembly will also produce an infinite resistance reading. Inspect the full wire run for physical damage, pinching, or corrosion at terminals.

  4. 04

    Defrost thermostat failing to open at cutoff temperature

    Part replacement

    If the defrost thermostat does not open at its rated cutoff point, heat continues to build beyond safe limits even when the heater element itself is functioning correctly. The thermostat should be tested for proper operation after the heater circuit is confirmed intact.

  5. 05

    Faulty main PCB misreading sensor signals

    Part replacement

    In some cases the main PCB incorrectly interprets temperature data from the defrost circuit and triggers E 24 without a true component failure. The PCB should be considered after all heating components and wiring have been tested and found to be within spec.

See the test procedure for each cause

Frequently asked questions about E 24

What does E 24 mean on a LG refrigerator?
E 24 on an LG RSG5B* series refrigerator means the freezer defrost system detected an overheating condition during the defrost cycle. The control board monitors the defrost heater circuit and shuts down the defrost process when temperatures exceed safe limits. The code identifies a fault in the heater, defrost thermistor, wiring, or related thermal components. Diagnostic testing at the main PCB connector CN70 is the recommended starting point to isolate the specific failure.
Can I fix E 24 on my LG refrigerator myself?
A knowledgeable DIYer can begin by disconnecting CN70 on the main PCB and using a multimeter to measure resistance between the Orange and Brown wire terminals. A 0 Ohm reading confirms a shorted heater, while infinite resistance points to an open circuit from a cut wire or blown thermistor. Replacing a defrost heater or thermistor is within reach for someone comfortable working with appliance wiring, but if the PCB is suspect or wiring damage is extensive, professional service is advisable.
Is it safe to keep using my refrigerator when E 24 is displayed?
Continued use is not recommended when E 24 is active. A shorted heater poses a risk of sustained overheating inside the freezer compartment, which can damage the evaporator coils and surrounding insulation. With defrost disabled, frost will also accumulate on the evaporator and gradually reduce cooling efficiency. Address the fault promptly to avoid secondary damage and potential food spoilage.
How much does it cost to repair an E 24 error on an LG refrigerator?
Repair costs depend on which component has failed. A defrost heater or thermistor replacement typically falls in the range of $80 to $200 including parts and labor. If the main PCB requires replacement, costs can rise to $250 to $450 or more depending on parts availability and service rates in your area. Getting a diagnostic assessment first helps avoid paying for parts that are not the root cause.
Will resetting my LG refrigerator clear the E 24 error?
A power reset may temporarily clear the E 24 code from the display, but it will not resolve the underlying fault. The error will return once the refrigerator attempts the next defrost cycle and the control board detects the same overheating or circuit problem again. A permanent fix requires identifying and replacing the failed component in the defrost heater circuit.

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