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Error code reference

LG Refrigerator Error Code E 23

Condenser fan error (RSG5B* model display).

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Condenser fan error (RSG5B* model display).

First step from the service manual

Check voltage between MAIN PCB CN74 GRAY and YELLOW; should be 7V~12V.

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

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What E 23 means on a LG refrigerator

The E 23 error code on LG RSG5B series refrigerators indicates a condenser fan motor fault. The condenser fan is responsible for drawing air across the condenser coils to dissipate heat from the refrigerant as it flows through the condenser. When this fan fails to operate correctly, heat buildup in the condenser section can reduce cooling efficiency, cause compressor overheating, and ultimately lead to a complete loss of refrigeration.

The primary diagnostic step for E 23 is to measure the supply voltage at the main PCB connector CN74 between the GRAY and YELLOW wires. This voltage should read between 7V and 12V under normal operating conditions. A reading outside this range points to a control board output failure, while a correct voltage reading at the connector with no fan operation suggests the fault lies in the fan motor itself, its wiring harness, or a mechanical obstruction preventing the motor from spinning.

Common root causes include a seized or failed condenser fan motor, wiring damage or corroded connectors between the PCB and the fan, and debris or ice buildup physically blocking the fan blade. The main PCB is also a possible cause if it fails to deliver the correct drive voltage to CN74. Proper diagnosis requires a multimeter to confirm voltage at the connector before any parts are replaced.

Source: manufacturer service documentation.

Common causes of E 23

  1. 01

    Failed condenser fan motor

    Part replacement

    The fan motor itself may have burned out or seized due to wear or overheating. If the correct voltage (7V to 12V) is present at CN74 but the fan does not spin, the motor has likely failed and needs replacement.

  2. 02

    Wiring harness or connector fault

    Wiring / connection

    Damaged wires or corroded connections between the main PCB connector CN74 and the condenser fan can interrupt power delivery to the motor. Inspect the GRAY and YELLOW wires for breaks, pinching, or corrosion at the connector terminals.

  3. 03

    Physical obstruction blocking the fan blade

    Wiring / connection

    Debris, dust accumulation, or ice buildup can jam the fan blade and prevent the motor from turning, triggering the error. Visually inspect the fan blade and clear any obstructions before further electrical testing.

  4. 04

    Main PCB output failure

    Part replacement

    If voltage at CN74 between the GRAY and YELLOW wires reads outside the 7V to 12V range, the main PCB is not supplying correct power to the fan circuit. This points to a faulty control board that may need replacement.

  5. 05

    Fan blade damage

    Part replacement

    A cracked or broken fan blade may cause the motor to run erratically or not at all due to imbalance or jamming. Inspect the blade for visible damage while the power is disconnected.

See the test procedure for each cause

Frequently asked questions about E 23

What does E 23 mean on a LG refrigerator?
E 23 on an LG refrigerator, specifically RSG5B series models, indicates a condenser fan error. The condenser fan is not operating as expected, which can cause the refrigerator to lose cooling ability. The first step in diagnosing this error is checking the voltage at main PCB connector CN74 between the GRAY and YELLOW wires, which should measure between 7V and 12V.
Can I fix the E 23 error on my LG refrigerator myself?
Some causes of E 23 are DIY-friendly, such as clearing debris or ice blocking the condenser fan blade. However, testing voltage at the main PCB connector CN74 and diagnosing whether the motor or control board has failed requires a multimeter and basic electrical knowledge. Replacing the condenser fan motor or main PCB is within reach for experienced DIYers, but those unfamiliar with appliance wiring should consult a technician.
Is it safe to keep using my LG refrigerator when E 23 is displayed?
Continuing to run the refrigerator with an active E 23 error is not recommended. Without a functioning condenser fan, heat cannot be properly dissipated from the condenser coils, which can cause the compressor to overheat and sustain permanent damage. Food safety may also be compromised if the unit loses its ability to maintain proper temperatures.
How much does it cost to repair the E 23 error on an LG refrigerator?
Repair costs vary depending on the cause. A condenser fan motor replacement typically costs between $80 and $200 including the part and labor. If the main PCB is at fault, parts and labor costs can range from $200 to $450 or more depending on the specific board and service rates in your area. A simple wiring repair or clearing an obstruction may cost significantly less.
Will resetting my LG refrigerator clear the E 23 error code?
A reset may temporarily clear the E 23 error code from the display, but if the underlying cause such as a failed fan motor, wiring fault, or PCB issue has not been resolved, the code will return. Resetting the unit without addressing the root cause can delay repairs and risk further damage to the compressor due to continued heat buildup.

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