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Error code reference

LG Range Error Code C-30

PCB temperature sensor is open or PCB temperature rises abnormally high.

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PCB temperature sensor is open or PCB temperature rises abnormally high.

First step from the service manual

Disconnect power. Open back cover. Replace the main PCB.

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

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What C-30 means on a LG range

The C-30 error code on an LG range indicates a fault with the PCB (printed circuit board) temperature sensor. This sensor monitors the thermal condition of the main control board itself. When the sensor circuit reads as open, meaning there is no continuity through the sensing element, or when the board temperature climbs beyond its acceptable operating threshold, the range triggers this code and halts normal operation to prevent component damage.

The main PCB contains onboard thermal protection circuitry. An open sensor condition typically points to a failed thermistor or sensing element soldered directly to the board, a broken trace on the PCB, or a loose internal connection within the board assembly. Abnormally high PCB temperature, on the other hand, can result from inadequate ventilation around the control board, a cooling fan failure (if equipped), or a board component that is drawing excessive current and generating heat as a byproduct of its own failure.

Because the sensor is integrated into the main PCB rather than being a separately replaceable standalone component, the standard diagnostic path is board replacement rather than individual component repair. The first step before any diagnosis is disconnecting power to the unit completely, then accessing the board by removing the rear cover panel. There is no external wiring harness or remote sensor to inspect in this fault path since the thermal sensing function originates on the board itself.

Source: manufacturer service documentation.

Common causes of C-30

  1. 01

    Failed onboard PCB temperature sensor

    Part replacement

    The thermistor or thermal sensing element integrated into the main PCB can fail in an open-circuit condition, producing no valid temperature reading. This triggers C-30 even when the board itself is not physically overheating.

  2. 02

    Main PCB internal component failure causing overheating

    Part replacement

    A shorted or failing component on the control board can cause localized or board-wide overheating. The onboard sensor detects the abnormal temperature rise and triggers the fault code.

  3. 03

    Restricted ventilation around the control board

    Wiring / connection

    Blocked vents or debris accumulation around the rear of the range can trap heat near the PCB enclosure, causing ambient temperature around the board to rise abnormally. Check the rear panel area for obstructions or buildup.

  4. 04

    Loose or broken PCB board trace

    Part replacement

    A cracked solder joint or broken trace on the PCB can interrupt the sensor circuit, creating an apparent open condition. This is difficult to identify visually without close inspection under magnification.

See the test procedure for each cause

Frequently asked questions about C-30

What does C-30 mean on a LG range?
C-30 means the main PCB temperature sensor has gone open circuit or the control board itself has reached an abnormally high temperature. The range triggers this code to protect its electronics from damage. It is a board-level fault that points directly to the main PCB as the affected component.
Can I fix the C-30 error myself, or do I need a technician?
The repair requires disconnecting power, removing the back cover of the range, and replacing the main PCB. A confident DIYer comfortable with appliance disassembly and handling circuit boards can perform this repair. However, if you are unsure about working inside an appliance or sourcing the correct replacement board, a qualified technician is the safer option.
Is it safe to use my LG range while the C-30 code is displayed?
No, you should not continue using the range while C-30 is active. This fault indicates a control board issue that could affect safe operation of the appliance. Disconnect power to the unit until the repair is completed.
Will resetting the power clear the C-30 error code?
A power reset may temporarily clear the display, but C-30 will return if the underlying PCB sensor fault or overheating condition has not been resolved. Because this fault originates in the control board hardware, a reset alone is not a fix and the code will reappear during normal operation.
How much does it cost to repair the C-30 error on an LG range?
The cost depends primarily on the price of the replacement main PCB for your specific model, which typically ranges from around $100 to $350 or more for the part alone. If you hire a technician, labor costs will add to that total, bringing the overall repair estimate to somewhere between $200 and $500 or higher depending on your location and service rates.

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