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Error code reference

LG Microwave Error Code E-25

Overheat during cooking causes temperature to reach 500F, stops all modes of cooking and converts to cancel…

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Overheat during cooking causes temperature to reach 500F, stops all modes of cooking and converts to cancel mode.

First step from the service manual

Replace the Sensor or the Control Circuit Board.

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

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What E-25 means on a LG microwave

The E-25 error code on an LG microwave indicates an overheat condition has been detected during a cooking cycle. When the internal temperature reaches 500 degrees Fahrenheit, the microwave's thermal monitoring system triggers this fault, immediately halting all active cooking modes and switching the unit into cancel mode. This is a protective shutdown designed to prevent damage to internal components and reduce fire risk.

The temperature monitoring function is handled by a thermal sensor that continuously reads internal cavity or component temperatures during operation. When the sensor reports a value at or above the threshold, the control circuit board interprets the signal as a fault condition and initiates the E-25 response. If either the sensor is reading inaccurately high values or the control board is misprocessing the sensor signal, the error can appear even when actual temperatures are within normal range.

True overheating can also occur due to blocked ventilation, a malfunctioning cooling fan, or extended cooking cycles that push the unit beyond its thermal limits. In these cases, the shutdown is a legitimate protective response rather than a sensor or board fault. Diagnosing whether the overheat is real or sensor-induced is the critical first step before replacing any components.

Source: manufacturer service documentation.

Common causes of E-25

  1. 01

    Faulty Thermal Sensor

    Part replacement

    The thermal sensor may be failing and reporting temperatures at or above 500 degrees Fahrenheit even when actual conditions are normal. A sensor that reads incorrectly high will trigger E-25 without any true overheat event.

  2. 02

    Control Circuit Board Malfunction

    Part replacement

    The control board may be misinterpreting or incorrectly processing the temperature signal from the sensor, causing a false E-25 fault. If the sensor tests within spec but the error persists, the board is the next component to evaluate.

  3. 03

    Blocked Ventilation

    Wiring / connection

    If the vents on the microwave are obstructed by cabinetry, grease buildup, or improper installation clearance, heat cannot escape efficiently and the unit can genuinely overheat during cooking. Inspect all vent openings for blockage before replacing components.

  4. 04

    Cooling Fan Failure

    Part replacement

    The internal cooling fan circulates air to keep components within safe temperature ranges. If the fan motor has failed or the fan blade is obstructed, heat accumulates rapidly during cooking and can legitimately trigger the 500 degree threshold.

  5. 05

    Extended or High-Power Cooking Cycles

    Wiring / connection

    Running the microwave continuously at maximum power for prolonged periods can push internal temperatures beyond design limits. This is more common in commercial-use scenarios or when cooking large volumes of food repeatedly without rest intervals.

See the test procedure for each cause

Frequently asked questions about E-25

What does E-25 mean on a LG microwave?
E-25 on an LG microwave means the unit detected an overheat condition during a cooking cycle, with the internal temperature reaching 500 degrees Fahrenheit. When this threshold is hit, the microwave immediately stops all cooking modes and switches to cancel mode as a safety measure. The fault can be caused by a defective thermal sensor, a malfunctioning control circuit board, or an actual overheat event from blocked vents or a failed cooling fan.
Can I reset the E-25 error code and keep using the microwave?
Unplugging the microwave and allowing it to cool down may temporarily clear the E-25 code, but if the underlying cause is not resolved, the error will return. If blocked vents or extended use caused the overheat, clearing the obstruction and allowing a cool-down period may resolve it. If the sensor or control board is faulty, a reset will not provide a lasting fix and the code will reappear during the next cooking cycle.
Is it safe to use my LG microwave while it shows the E-25 error?
No, you should not attempt to continue cooking while E-25 is active. The microwave is designed to shut down all cooking modes when this code appears precisely because operating at or above 500 degrees Fahrenheit poses a risk of component damage or fire. Allow the unit to fully cool down and diagnose the cause before attempting to use it again.
How do I fix the E-25 error on my LG microwave?
Start by checking that all ventilation openings are clear and that the microwave has proper clearance around it as required by the installation specifications. If ventilation is adequate, the next step is to inspect and test the thermal sensor, as a faulty sensor is one of the primary causes of this code. If the sensor is not the issue, the control circuit board should be evaluated and replaced if defective. Both components require replacement parts and, given the high-voltage components inside a microwave, professional repair is strongly recommended.
How much does it cost to repair an LG microwave with an E-25 error?
Repair costs vary depending on which component is at fault. A thermal sensor replacement is generally the less expensive repair, typically ranging from $50 to $150 including parts and labor. Replacing the control circuit board tends to cost more, often in the range of $100 to $300 depending on the specific model and service provider. If the microwave is older, comparing the repair estimate against replacement cost is worth considering before proceeding.

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