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Error code reference

LG Microwave Error Code E-22

Temperature Sensor Short Error

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Temperature Sensor Short Error — when temperature sensor value is below 5, marks E-22 and converts to cancel mode.

First step from the service manual

Check if both terminals of the sensor are slightly shorted; remove any foreign substance from the shorted part.

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

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What E-22 means on a LG microwave

The E-22 error code on an LG microwave indicates a Temperature Sensor Short Error. This fault is triggered when the microwave's control board reads a sensor value below 5 from the temperature sensor circuit, which falls outside the acceptable operating range. When this threshold is crossed, the control board interprets the reading as a short condition and immediately converts the unit to cancel mode, halting any active cooking cycle to prevent further operation under a potentially faulty sensor state.

The temperature sensor in an LG microwave is a thermistor-type component that monitors internal cavity temperature during cooking operations. Under normal conditions, the sensor produces a resistance value that the control board translates into a temperature reading. When the sensor terminals become shorted, either through physical contact between the terminals or the presence of a foreign substance bridging them, the resistance drops abnormally low, producing a sensor value below the minimum threshold. This false low reading signals to the control board that a fault condition exists.

The first diagnostic step is to inspect both terminals of the temperature sensor for a short circuit condition. Foreign substances such as food debris, grease buildup, or condensation can accumulate on or between the sensor terminals and create an unintended electrical path that mimics a short. If contamination is found, carefully cleaning the affected area may resolve the fault. If the terminals appear physically damaged or the sensor itself has failed internally, replacement of the temperature sensor will be required to restore normal operation.

Source: manufacturer service documentation.

Common causes of E-22

  1. 01

    Foreign substance on sensor terminals

    Wiring / connection

    Grease, food debris, or moisture can accumulate between the temperature sensor terminals, creating an unintended electrical path that produces a falsely low sensor value. Inspect the terminals visually and clean away any visible contamination.

  2. 02

    Shorted sensor terminals

    Wiring / connection

    Physical contact between the two sensor terminals, whether from mechanical deformation or debris, causes the circuit to read below the minimum threshold of 5 and trigger E-22. Check whether the terminals are touching or bent toward each other.

  3. 03

    Failed temperature sensor

    Part replacement

    The thermistor inside the temperature sensor can fail internally, producing a permanently shorted condition regardless of external contamination. If cleaning the terminals does not resolve the fault, the sensor itself likely needs replacement.

  4. 04

    Damaged sensor wiring or connector

    Part replacement

    The wiring harness leading to the temperature sensor can sustain insulation damage or a pinched conductor, causing a short that the control board reads as a low sensor value. Inspect the wiring and connector for visible damage or bare wire contact.

  5. 05

    Faulty control board

    Part replacement

    If the temperature sensor and its wiring check out correctly, the control board may be misreading the sensor circuit due to a component-level fault on the board itself. This is the least likely cause and should only be considered after other components are ruled out.

See the test procedure for each cause

Frequently asked questions about E-22

What does E-22 mean on a LG microwave?
E-22 on an LG microwave is a Temperature Sensor Short Error. It occurs when the control board reads a sensor value below 5 from the temperature sensor circuit, indicating a short condition at the sensor. The microwave responds by entering cancel mode and stopping operation. This is a protective measure to prevent cooking under a potentially faulty sensor state.
Can I fix the E-22 error myself on my LG microwave?
In some cases, yes. The first step is to inspect both terminals of the temperature sensor for any foreign substances such as grease or food residue that may be bridging the terminals and causing a short. Carefully removing any contamination may clear the fault without any parts replacement. If the sensor terminals are physically damaged or the sensor has failed internally, replacing the temperature sensor is required and is a more involved repair.
Will resetting my LG microwave clear the E-22 error?
A reset alone is unlikely to permanently clear E-22 if the underlying short condition at the sensor is still present. The control board will detect the out-of-range sensor value again as soon as it checks the circuit and re-trigger the error. The root cause, whether contamination on the terminals or a failed sensor, must be addressed before the unit will operate normally.
Is it safe to use my LG microwave while it shows E-22?
No. When E-22 is active, the microwave enters cancel mode and will not run a cooking cycle, so continued use is not possible in that state. Attempting to bypass or ignore this fault is not recommended, as the temperature sensor is a safety-related component. The fault should be diagnosed and corrected before the appliance is returned to service.
How much does it cost to repair an LG microwave E-22 error?
If the fault is caused by contamination on the sensor terminals, the repair may cost nothing beyond your time. If the temperature sensor itself needs to be replaced, parts and labor costs typically range from around $50 to $150 depending on the specific model and whether a professional technician is needed. If the control board is found to be at fault, repair costs can be higher, often ranging from $100 to $250 or more.

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