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Error code reference

LG Microwave Error Code 0t

Temperature sensor of PCB short-circuit error (alternate display for cooling fan motor sensor error).

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Temperature sensor of PCB short-circuit error (alternate display for cooling fan motor sensor error).

First step from the service manual

Repair the short circuit on the temperature sensor.

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

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What 0t means on a LG microwave

The 0t error code on an LG microwave indicates a short-circuit condition in the temperature sensor located on the PCB (printed circuit board). This sensor monitors the internal temperature of the control board to prevent thermal damage during operation. When the sensor detects a short circuit, the microwave halts normal operation to protect both the electronics and the user. In some LG models, 0t may also appear as an alternate display for a cooling fan motor sensor error, meaning the underlying fault can involve either the PCB-mounted thermistor or the sensor tied to the cooling fan circuit.

A short circuit in the temperature sensor typically results from one of a few conditions: physical damage to the sensor or its wiring harness, moisture or contamination on the PCB causing unintended electrical contact, or component-level failure of the thermistor itself. Because the sensor is integrated into or closely connected to the main control board, identifying whether the fault is in the sensor wiring, the sensor component, or the board itself is a critical part of diagnosis.

Diagnosis begins with inspecting the wiring harness connected to the temperature sensor for pinched, burned, or bare conductors that could create a short to ground or to an adjacent circuit. If wiring appears intact, the thermistor should be tested for resistance values outside its expected range, which would indicate an internal short. If the short originates on the PCB itself, board-level repair or full control board replacement is likely required.

Source: manufacturer service documentation.

Common causes of 0t

  1. 01

    Shorted PCB temperature sensor (thermistor)

    Part replacement

    The thermistor mounted on the control board can fail internally, creating a short circuit. Testing the sensor for resistance values outside the normal range will confirm this failure.

  2. 02

    Damaged or pinched sensor wiring harness

    Part replacement

    Wiring connecting the temperature sensor to the PCB can become pinched, chafed, or burned, causing a short to ground or to an adjacent conductor. A visual inspection of the harness routing will often reveal this condition.

  3. 03

    Moisture or contamination on the PCB

    Wiring / connection

    Steam, grease, or condensation entering the control board cavity can create unintended conductive paths across sensor circuit traces. Look for discoloration, corrosion, or residue on the board surface near the sensor connections.

  4. 04

    Cooling fan motor sensor fault

    Part replacement

    On applicable LG models, 0t can represent a cooling fan motor sensor error rather than a PCB thermistor fault. If the PCB sensor checks out, inspect the sensor associated with the cooling fan motor for damage or wiring issues.

  5. 05

    Failed or damaged main control board

    Part replacement

    If the short circuit originates within the PCB traces or components rather than in external wiring, the control board itself may be the failed component requiring repair or replacement.

See the test procedure for each cause

Frequently asked questions about 0t

What does 0t mean on a LG microwave?
The 0t error code indicates a short-circuit condition in the temperature sensor on the PCB (printed circuit board). On some LG microwave models it can also appear as an alternate code for a cooling fan motor sensor error. The microwave shuts down to prevent damage when this fault is detected. A technician needs to locate the short in the sensor, its wiring, or the board itself to restore operation.
Can I fix the 0t error on my LG microwave myself?
Diagnosing a short-circuit fault requires safely accessing internal components, which involves working near high-voltage capacitors that can retain a dangerous charge even after the unit is unplugged. Technicians with appliance repair experience can inspect the sensor wiring harness and test the thermistor for resistance, but most homeowners should have a qualified technician handle this repair. If the short is in the wiring rather than the board, the fix may be straightforward once the fault is located.
Is it safe to use my LG microwave while the 0t error is showing?
No. The 0t error means the microwave has detected a fault in its temperature monitoring circuit and has likely stopped normal operation as a protective measure. Attempting to bypass or ignore this error and continue using the unit risks further electrical damage and potential safety hazards. The microwave should remain unplugged until the fault is repaired.
Will resetting my LG microwave clear the 0t error?
Unplugging the microwave and restoring power may temporarily clear the display, but the 0t error will return if the underlying short circuit has not been corrected. The fault is hardware-based, meaning a reset does not address the damaged or failed sensor component. Repair of the short circuit must be completed before the error will stay cleared.
How much does it cost to repair the 0t error on a LG microwave?
Repair costs vary depending on whether the fault is in the wiring harness, the thermistor sensor, or the main control board. A wiring repair is typically the least expensive scenario, while control board replacement can run significantly higher. Total repair costs including labor generally range from around $100 to $350 or more, depending on the specific component required and local labor rates. It is worth comparing the repair estimate to the cost of a replacement unit before proceeding.

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