mypros+
Error code reference

LG Refrigerator Error Code iD

Ice room (IR) sensor disconnection or short circuit (displays 'Lo' for disconnection, 'Hi' for short).

LG codesLG refrigerator codes

Ice room (IR) sensor disconnection or short circuit (displays 'Lo' for disconnection, 'Hi' for short).

First step from the service manual

Measure the resistance between both terminals after separating CN15 of the Main PCB. If IR-sensor is disconnected or shorted, change the IR-sensor on the evaporator.

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

MyPros+ Max

Get the full diagnostic procedure for iD.

  • 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 iD means on a LG refrigerator

The iD error code on an LG refrigerator indicates a fault with the Ice Room (IR) sensor, which monitors temperature inside the ice maker compartment. When the Main PCB detects an abnormal signal from this sensor, it triggers the iD code. The display modifier tells you what type of fault is present: 'Lo' appears when the sensor circuit is open (disconnected), meaning the PCB is receiving no signal at all, while 'Hi' appears when the sensor is shorted, meaning resistance has collapsed and the PCB reads an unrealistically low temperature value.

The IR sensor is a thermistor located on the evaporator within the ice room section. Like all thermistors, it changes resistance in response to temperature, and the PCB interprets that resistance to regulate ice-making functions. Diagnosis begins at connector CN15 on the Main PCB. Separating that connector and measuring resistance across both terminals reveals whether the sensor itself is at fault or whether the wiring harness is the source of the problem. A properly functioning sensor will show a resistance value consistent with the ambient temperature at the time of measurement.

Common causes include physical damage to the sensor body, corrosion or moisture intrusion at the connector, or a wiring harness that has been pinched or chafed during a previous service. If the out-of-range resistance is confirmed at CN15, the IR sensor mounted on the evaporator must be replaced. If resistance reads correctly at CN15, the fault lies in the wiring between that connector and the sensor, or in the PCB itself.

Source: manufacturer service documentation.

Common causes of iD

  1. 01

    Failed IR thermistor sensor

    Part replacement

    The thermistor on the evaporator can fail due to age, moisture exposure, or physical damage, resulting in an open or shorted circuit. Confirming this requires measuring resistance at the CN15 connector terminals after disconnecting the harness.

  2. 02

    Loose or corroded connector at CN15

    Wiring / connection

    Moisture or vibration can cause the CN15 connector on the Main PCB to loosen or corrode over time, creating an intermittent or complete loss of signal. Inspect the connector pins for oxidation, bent contacts, or debris before replacing the sensor.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire harness running from the evaporator sensor to CN15 can be pinched, chafed, or cracked, causing either an open circuit or a short to ground. Visually trace the harness for any obvious damage and check continuity along each wire.

  4. 04

    Ice or frost bridging around the sensor

    Wiring / connection

    Excessive ice buildup on the evaporator can physically stress or damage the sensor body and its lead wires. If a defrost issue is also present, addressing the root cause of ice accumulation may be necessary alongside sensor replacement.

  5. 05

    Faulty Main PCB

    Part replacement

    If the wiring harness and sensor both test within normal resistance ranges at CN15, the Main PCB may be misreading the signal due to an internal component failure. PCB replacement is typically considered only after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about iD

What does iD mean on a LG refrigerator?
The iD code indicates a problem with the Ice Room (IR) sensor, a thermistor that monitors temperature inside the ice maker compartment. If the display also shows 'Lo', the sensor circuit is open or disconnected. If it shows 'Hi', the sensor is shorted. In both cases, the ice maker may not function correctly until the fault is resolved.
Can I fix the iD error code myself?
A knowledgeable DIYer can perform the initial diagnostic step by locating CN15 on the Main PCB and measuring resistance across both terminals with a multimeter after disconnecting the harness. If the sensor tests as open or shorted, replacing the IR sensor on the evaporator is the recommended repair. Working inside the refrigerator near the evaporator does require removing interior panels, so comfort with appliance disassembly is helpful.
Is it safe to keep using my refrigerator with an iD error code?
The iD code specifically affects the ice room sensor and ice maker operation, so your main refrigerator and freezer compartments may continue cooling normally. However, running the appliance with a faulty sensor means the ice maker is operating without proper temperature feedback, which can lead to poor ice production or no ice at all. It is best to address the fault promptly to avoid potential secondary issues.
How much does it cost to repair an iD error on an LG refrigerator?
If only the IR sensor needs replacement, parts typically range from $15 to $60 depending on the specific model. If a technician performs the repair, labor costs can bring the total to $100 to $250 or more. A Main PCB replacement, if required, is a more expensive repair and could range from $200 to $500 or higher including labor.
Will resetting the refrigerator clear the iD error code?
A power reset may temporarily clear the iD code from the display, but it will return if the underlying sensor fault is still present. The code is triggered by an actual electrical condition, either an open or shorted sensor circuit, so the fault must be diagnosed and repaired for the code to stay off. Resetting without repairing does not fix the ice maker.

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