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Error code reference

LG Microwave Error Code E-26

Temperature did not rise above fixed AD value within first 3 minutes after heater cooking started.

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Temperature did not rise above fixed AD value within first 3 minutes after heater cooking started.

First step from the service manual

Check sensor and heater.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What E-26 means on a LG microwave

The E-26 error code on an LG microwave indicates that the internal temperature sensor did not detect a rise above a fixed analog-to-digital (AD) conversion threshold within the first three minutes after heater cooking began. This is a time-based temperature validation check built into the control system. During heater cooking mode, the microwave's control board monitors the sensor output in real time and expects to see a measurable temperature increase within that initial window. If the AD value from the sensor fails to cross the programmed threshold in that period, the unit flags E-26 and halts operation to prevent unsafe or ineffective cooking conditions.

The two primary components involved are the temperature sensor and the heater assembly. The sensor converts heat into a varying voltage or resistance signal that the control board translates into an AD value. If the sensor is faulty, damaged, or has a broken connection, it may report a static or incorrect value regardless of actual heat output. Alternatively, if the heater itself is not generating sufficient heat due to a failure in the heating element or its associated circuitry, the temperature will genuinely not rise fast enough to satisfy the threshold check, even if the sensor is functioning correctly.

Diagnosis should begin by inspecting the sensor for visible damage and verifying its electrical continuity and output characteristics. The heater should also be tested to confirm it is drawing power and producing heat during operation. Wiring and connector integrity between both components and the control board are worth checking as well, since a poor connection can produce the same symptom as a failed component.

Source: manufacturer service documentation.

Common causes of E-26

  1. 01

    Faulty Temperature Sensor

    Part replacement

    The temperature sensor may be defective, producing a flat or out-of-range signal that never crosses the required AD threshold even when heat is present. Check the sensor for continuity and verify its output changes appropriately with temperature.

  2. 02

    Failed Heater Element

    Part replacement

    If the heating element is burned out or not receiving proper power, the cavity temperature will not rise within three minutes. Inspect the heater for visible damage and test it for continuity.

  3. 03

    Loose or Damaged Wiring to Sensor or Heater

    Wiring / connection

    A broken wire or corroded connector between the sensor, heater, and control board can interrupt the signal or power supply, causing the error even if both components are physically intact. Inspect all related connectors and harnesses for damage or poor contact.

  4. 04

    Control Board Failure

    Part replacement

    If the control board is unable to correctly read the AD value from the sensor, it may trigger E-26 even when the sensor and heater are working normally. This is less common but should be considered after ruling out the sensor and heater.

See the test procedure for each cause

Frequently asked questions about E-26

What does E-26 mean on a LG microwave?
E-26 on an LG microwave means the control board did not detect a temperature rise above a programmed threshold within the first three minutes after a heater cooking cycle started. The microwave monitors an internal temperature sensor during this window, and if the sensor's analog-to-digital output does not reach the expected value, the unit stops and displays this code. The fault points to either the temperature sensor or the heater assembly as the most likely cause.
Can I fix E-26 on my LG microwave myself?
Some steps, such as checking wiring connections to the sensor and heater, are approachable for a knowledgeable DIYer. However, testing and replacing a heating element or temperature sensor involves working inside a microwave, which stores dangerously high voltage in its capacitor even when unplugged. If you are not experienced with appliance repair and high-voltage safety procedures, it is strongly recommended to have a qualified technician perform the repair.
Is it safe to keep using my LG microwave when E-26 is showing?
No, you should not continue using the microwave while E-26 is active. The error indicates the heating system is not functioning as expected, and the unit typically halts operation when this code appears. Using it in this condition could result in ineffective cooking or further component damage.
How much does it cost to repair an LG microwave with error code E-26?
Repair costs vary depending on which component has failed. A replacement temperature sensor typically runs in the range of $15 to $50 for the part, while a heater element can range from $30 to $100 or more depending on the model. Adding labor from a technician will increase the total cost, generally bringing the repair into the $100 to $250 range for most situations.
Will resetting my LG microwave clear the E-26 error code?
Unplugging the microwave for a minute and plugging it back in may temporarily clear the code, but the error will return if the underlying issue with the sensor or heater has not been resolved. E-26 is triggered by an active failure condition detected during operation, so a reset alone is not a fix. The root cause must be diagnosed and repaired to prevent the code from reappearing.

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