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Error code reference

LG Refrigerator Error Code F1 F3

Abnormal freezer BLDC fan motor

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Abnormal freezer BLDC fan motor - no position signal over 65 seconds when fan motor operates.

First step from the service manual

MICOM stops fan motor and re-checks operation every 30 minutes; if normal condition returns, system resets.

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

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What F1 F3 means on a LG refrigerator

The F1 F3 error code on an LG refrigerator indicates an abnormal condition with the freezer compartment BLDC (brushless DC) fan motor. Specifically, the control board (MICOM) is not receiving a position signal from the fan motor for a continuous period exceeding 65 seconds while the motor is commanded to run. BLDC motors rely on a feedback signal to confirm rotor position and verify rotation. When this signal is absent, the MICOM cannot confirm the motor is actually spinning, and the fault is triggered.

The freezer fan is responsible for circulating cold air from the evaporator coils throughout the freezer and, in many configurations, into the fresh food compartment. A failure in this fan circuit typically results in rising temperatures, frost accumulation, and inconsistent cooling. Common sources of the fault include a seized or obstructed fan motor, a break in the wiring harness between the motor and the control board, a failed motor winding, or a faulty MICOM that is not properly sending or receiving signals.

When the error is detected, the MICOM executes a protective response: it stops the fan motor and then re-checks its operation every 30 minutes. If the motor returns to normal operation during one of these re-check cycles, the system will reset automatically without requiring manual intervention. Persistent faults that do not self-resolve across multiple re-check cycles indicate a hardware failure requiring physical inspection and component testing.

Source: manufacturer service documentation.

Common causes of F1 F3

  1. 01

    Ice or debris obstructing the fan blade

    Wiring / connection

    Ice buildup around the evaporator area can physically block the fan blade from spinning, preventing the motor from generating a position signal. Inspect the fan blade for ice obstruction and defrost the freezer manually if ice is present.

  2. 02

    Failed freezer BLDC fan motor

    Part replacement

    The motor windings or internal hall-effect sensor can fail, causing the motor to stop spinning or stop sending a position feedback signal to the MICOM. A failed motor will need to be replaced.

  3. 03

    Damaged or disconnected wiring harness

    Wiring / connection

    The wiring between the fan motor and the control board can become pinched, corroded, or disconnected, interrupting the position signal. Inspect the full harness run from the motor connector to the board for visible damage or loose connections.

  4. 04

    Faulty main control board (MICOM)

    Part replacement

    If the control board is not correctly supplying power to the motor or is not reading the returning position signal, it can trigger this fault even when the motor itself is functional. This is less common but should be considered after the motor and wiring are confirmed good.

  5. 05

    Seized fan motor bearing

    Part replacement

    Over time, the fan motor bearings can wear out and seize, preventing the blade from rotating despite receiving a power signal. A grinding or absent sound from the fan area during operation is a common indicator.

See the test procedure for each cause

Frequently asked questions about F1 F3

What does F1 F3 mean on a LG refrigerator?
F1 F3 indicates that the freezer BLDC fan motor is not sending a position signal back to the control board for more than 65 seconds during operation. This means the control board cannot confirm the fan is actually spinning. The freezer fan is critical for circulating cold air, and without it, temperatures in the freezer and fresh food sections can rise. The refrigerator will automatically stop and restart the fan every 30 minutes to check if the issue clears.
Can I fix the F1 F3 error on my LG refrigerator myself?
Some causes are DIY-friendly, particularly if the fan blade is blocked by ice. Manually defrosting the freezer by unplugging the refrigerator for 24 to 48 hours can clear an ice obstruction and resolve the error. If the issue is a failed fan motor or damaged wiring, those repairs require basic appliance repair skills, a multimeter for testing, and sourcing a compatible replacement motor.
Is it safe to keep using my refrigerator when F1 F3 is displayed?
Continued use is not recommended without addressing the fault. Without a functioning freezer fan, air circulation is compromised and freezer temperatures will likely rise, putting stored food at risk. The refrigerator does attempt to restart the fan every 30 minutes, but if the fault persists, you should not rely on the unit to maintain safe food temperatures.
Will resetting my LG refrigerator clear the F1 F3 error code?
A manual reset, such as unplugging the unit for a few minutes, may temporarily clear the displayed code, but the error will return if the underlying hardware problem is not fixed. The MICOM is designed to automatically reset if the fan returns to normal operation during one of its 30-minute re-check cycles. A persistent error after multiple cycles points to a component that needs inspection or replacement.
How much does it cost to repair an F1 F3 error on an LG refrigerator?
Repair costs vary depending on the root cause. A replacement freezer fan motor typically ranges from $30 to $80 for the part alone. If professional labor is required, total repair costs including diagnosis and installation generally fall in the range of $150 to $300. A main control board replacement, if needed, can push costs higher, often ranging from $200 to $400 total.

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