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Error code reference

LG Refrigerator Error Code R dS

Refrigerator defrost sensor error caused by short or disconnection of the defrost sensor (Orange to Orange or…

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Refrigerator defrost sensor error caused by short or disconnection of the defrost sensor (Orange to Orange or Gray to Gray wires).

First step from the service manual

Check for a loose connection, then measure resistance at CON7.

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

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What R dS means on a LG refrigerator

The R dS error code on an LG refrigerator indicates a defrost sensor fault in the fresh food (refrigerator) compartment. Specifically, the control board has detected either a short circuit or an open circuit (disconnection) in the defrost sensor circuit. The defrost sensor monitors temperatures during the defrost cycle to prevent the evaporator from overheating and to signal the control board when defrost is complete. When the sensor circuit falls outside acceptable resistance parameters, the board flags the R dS fault and may interrupt normal defrost operation.

The sensor circuit runs through two wire pairs identified by color: orange to orange and gray to gray. A fault in either pair can trigger this code. The most direct diagnostic approach is to inspect connector CON7 at the control board, where the sensor wires terminate. A loose, corroded, or physically damaged connector at CON7 is the first thing to rule out before condemning the sensor itself. After confirming the connection is solid, resistance measurement across the sensor terminals at CON7 will confirm whether the sensor is shorted, open, or reading within spec.

Common root causes include a failed defrost sensor (open or shorted thermistor element), damaged wiring between the sensor and CON7, or a compromised connector. Physical damage from ice buildup in the freezer cavity can pinch or sever sensor wires over time. In less common cases, the control board itself may have a faulty input circuit at CON7, though wiring and sensor integrity should be ruled out first.

Source: manufacturer service documentation.

Common causes of R dS

  1. 01

    Loose or corroded connector at CON7

    Wiring / connection

    The sensor wiring harness connector at CON7 on the control board can work loose over time or develop corrosion that breaks the circuit. This is the first thing to check since it requires no parts and is a quick fix if found.

  2. 02

    Failed defrost sensor (open or shorted thermistor)

    Part replacement

    The defrost sensor thermistor element can fail internally, producing either no resistance (short) or infinite resistance (open). Measuring resistance at CON7 with the sensor disconnected will confirm this failure mode.

  3. 03

    Damaged wiring in the orange or gray wire pairs

    Part replacement

    The orange-to-orange or gray-to-gray wires running from the sensor to CON7 can be pinched, chafed, or severed, particularly if ice has accumulated around the wiring path. Visually inspect the wire routing for damage.

  4. 04

    Ice buildup causing physical wire damage

    Part replacement

    Excessive frost or ice accumulation in the evaporator area can compress and eventually break sensor wires. This is often accompanied by visible frost buildup inside the refrigerator compartment.

  5. 05

    Faulty control board input circuit at CON7

    Part replacement

    If the sensor and all wiring test within specification but the error persists, the CON7 input circuit on the control board may be defective. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about R dS

What does R dS mean on a LG refrigerator?
R dS indicates a defrost sensor error in the refrigerator compartment. The control board has detected either a short circuit or an open (disconnected) circuit in the defrost sensor wiring, specifically in the orange-to-orange or gray-to-gray wire pairs. The defrost sensor is responsible for monitoring evaporator temperatures during defrost cycles, and this fault can disrupt that process.
Can I fix the R dS error myself?
Some causes of the R dS error are DIY-friendly. Start by checking the CON7 connector at the control board for a loose or corroded connection, as reseating it may clear the fault without any parts. If the connector is secure, you can measure the resistance at CON7 to test the sensor. Replacing the defrost sensor is a moderately straightforward repair, but working inside the refrigerator's sealed compartment and control board area requires basic electrical knowledge and safety precautions.
Is it safe to keep using my LG refrigerator when R dS is displayed?
A defrost sensor fault means the refrigerator may not complete defrost cycles properly, which can cause frost to accumulate on the evaporator over time. This can eventually restrict airflow and cause temperatures to rise, putting food safety at risk. Short-term use may be acceptable, but the issue should be diagnosed and repaired promptly to avoid further problems.
How much does it cost to repair the R dS error on an LG refrigerator?
If only a connector needs to be reseated, there is no parts cost. A replacement defrost sensor typically costs in the range of $15 to $50 for the part. If a technician is needed, total repair costs including labor generally range from $100 to $250 depending on your location and the extent of the repair.
Will resetting my LG refrigerator clear the R dS error code?
A reset may temporarily clear the R dS code from the display, but the error will return if the underlying fault in the defrost sensor circuit has not been corrected. Resetting without repairing the sensor or wiring does not fix the problem and can delay necessary repairs. The code should be cleared only after the defective component or connection has been addressed.

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