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Error code reference

LG Refrigerator Error Code Er 10

Abnormal water tank sensor

LG codesLG refrigerator codes

Abnormal water tank sensor - short circuit in water tank sensor.

First step from the service manual

Check water tank sensor resistance with a multimeter.

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

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What Er 10 means on a LG refrigerator

The Er 10 error code on an LG refrigerator indicates an abnormal condition in the water tank sensor, specifically a short circuit within that sensor circuit. The water tank sensor is a thermistor-based component that monitors the temperature of the water stored in the internal water tank, which is used for the dispenser system. When the control board detects that the sensor signal has dropped to a voltage or resistance level consistent with a short circuit, it flags Er 10 and may disable related functions to protect the system.

A short circuit in the sensor circuit means the resistance across the sensor terminals has fallen abnormally low, typically near zero ohms, instead of reading within the expected range for the current temperature. This can be caused by damaged sensor wiring, a failed thermistor element inside the sensor itself, or moisture and corrosion bridging the sensor connector pins. The control board interprets this low-resistance reading as an out-of-range fault and triggers the error.

Diagnosing Er 10 begins with disconnecting the water tank sensor connector and measuring resistance across the sensor terminals using a multimeter. A shorted sensor will read near 0 ohms rather than the expected resistance value for the ambient temperature. Inspect the wiring harness between the sensor and the control board for pinched, chafed, or melted insulation that could be causing the conductors to contact each other. If the wiring is intact but the sensor reads shorted, the sensor itself requires replacement.

Source: manufacturer service documentation.

Common causes of Er 10

  1. 01

    Failed water tank sensor (shorted thermistor)

    Part replacement

    The thermistor element inside the sensor has failed internally, creating a short circuit. Measuring the sensor directly with a multimeter will show near-zero resistance regardless of temperature.

  2. 02

    Damaged sensor wiring harness

    Part replacement

    The wiring between the water tank sensor and the control board may be pinched, chafed, or melted, causing the two conductors to contact each other and produce a short. Visually inspect the full length of the harness for any signs of damage.

  3. 03

    Corroded or moisture-contaminated sensor connector

    Wiring / connection

    Water or condensation can enter the sensor connector and bridge the terminals, simulating a short circuit. Inspect the connector for visible corrosion, discoloration, or moisture, and clean or replace the connector as needed.

  4. 04

    Control board fault

    Part replacement

    In rare cases, a fault on the main control board itself can cause the sensor input circuit to report a false short. This should only be considered after the sensor and wiring have been confirmed to be in good condition.

See the test procedure for each cause

Frequently asked questions about Er 10

What does Er 10 mean on a LG refrigerator?
Er 10 on an LG refrigerator indicates a short circuit detected in the water tank sensor circuit. The water tank sensor is a thermistor that monitors the temperature of the internal water supply used by the dispenser. The control board triggers this code when it reads an abnormally low resistance signal from the sensor, which is consistent with a short circuit condition.
How do I fix the Er 10 error on my LG refrigerator?
Start by unplugging the refrigerator and locating the water tank sensor connector. Use a multimeter to measure the resistance across the sensor terminals. If the reading is near zero ohms, the sensor has shorted and needs to be replaced. Also inspect the wiring harness for any visible damage or pinching that could be causing the conductors to short together.
Will resetting my LG refrigerator clear the Er 10 error?
Resetting the refrigerator by unplugging it for a few minutes may temporarily clear the display, but Er 10 will return if the underlying short circuit in the water tank sensor or its wiring has not been corrected. A reset is useful for confirming whether the fault is intermittent, but it is not a repair.
Is it safe to keep using my refrigerator while Er 10 is displayed?
The Er 10 error primarily affects the water dispenser system and its temperature monitoring. The refrigerator and freezer compartments will generally continue to cool food, but the water dispensing function may be impaired or disabled. It is best to address the fault promptly to avoid any further issues with the dispenser system.
How much does it cost to repair an Er 10 error on an LG refrigerator?
If only the water tank sensor needs replacement, parts typically range from $15 to $50, and the repair is relatively straightforward for someone comfortable working with appliances. If the wiring harness requires repair or the control board is involved, labor and parts costs can range from $100 to $300 or more depending on the extent of the damage and local service rates.

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