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Error code reference

LG Microwave Error Code E

Invalid input error

LG codesLG microwave codes

Invalid input error – appears when an invalid time of day is set (outside 1:00–12:59), when weight input exceeds the acceptable maximum, or when an incorrect entry is made.

First step from the service manual

Touch STOP/CLEAR to clear the error, then re-enter the correct value.

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

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What E means on a LG microwave

The E error code on an LG microwave indicates an invalid input error. This code is generated by the microwave's control board when the user attempts to enter a value that falls outside the acceptable range for a given function. The error is not tied to a hardware component failure, but rather to the input validation logic built into the microwave's control system. The display triggers this code when the unit receives data it cannot process within its programmed parameters.

There are three primary scenarios that trigger the E error. First, entering a time of day outside the valid range of 1:00 to 12:59 will cause the code to appear. Second, entering a weight value that exceeds the maximum the unit accepts for weight-based cooking functions will also produce this error. Third, any other incorrect or out-of-range entry during programming or operation can trigger it. In each case, the control board rejects the input and displays E to prompt the user to re-enter a valid value.

Because this error is input-driven rather than component-driven, it does not indicate a failing part or a safety concern in most cases. The resolution is straightforward: press the STOP/CLEAR pad to dismiss the error and clear the current input, then re-enter the correct value within the accepted range. If the error persists even after entering values that appear to be valid, the touchpad or control board may warrant further inspection.

Source: manufacturer service documentation.

Common causes of E

  1. 01

    Clock time entered outside valid range

    Wiring / connection

    The microwave only accepts times between 1:00 and 12:59. Entering a value like 13:00 or 0:00 will immediately trigger the E error.

  2. 02

    Weight entry exceeds maximum limit

    Wiring / connection

    Weight-based cooking functions have a maximum input value. Entering a weight above that ceiling causes the control board to reject the entry and display E.

  3. 03

    Incorrect or out-of-range cooking time or power entry

    Wiring / connection

    Entering an invalid value in any cooking or function input field, such as a time or power level outside acceptable bounds, can also generate this error.

  4. 04

    Unintended key press sequence

    Wiring / connection

    Pressing multiple pads in rapid succession or in the wrong order can produce an invalid entry that the control board flags as E. Reviewing the correct sequence for the desired function before re-entering usually resolves this.

  5. 05

    Faulty or unresponsive touchpad

    Part replacement

    If the E error appears repeatedly even when entering values that should be valid, a worn or malfunctioning touchpad may be sending incorrect signals to the control board. This scenario is less common but would require touchpad replacement.

See the test procedure for each cause

Frequently asked questions about E

What does E mean on a LG microwave?
The E error on an LG microwave signals an invalid input error. It appears when a value entered by the user falls outside the range the microwave accepts, such as a clock time outside 1:00 to 12:59, a weight that exceeds the maximum, or any other out-of-range entry. The control board displays E to indicate it has rejected the input and is waiting for a corrected value.
How do I fix the E error on my LG microwave?
Press the STOP/CLEAR pad to clear the error and cancel the current input. Then re-enter the correct value, making sure a clock time is between 1:00 and 12:59 and that any weight entry does not exceed the unit's maximum. If the error continues to appear after entering valid values, the touchpad may need to be inspected or replaced.
Will pressing STOP/CLEAR reset the E error on a LG microwave?
Yes, pressing STOP/CLEAR will clear the E error from the display. The microwave is not locked out and will return to normal operation once the error is cleared. You will need to re-enter the correct value after clearing to complete whatever function you were setting up.
Is the E error on a LG microwave a safety concern?
No, the E error does not indicate a safety issue. It is strictly an input validation response from the control board and does not reflect a problem with the magnetron, heating system, or any other functional component. The microwave is safe to continue using once the error is cleared and a valid input is entered.
How much does it cost to repair a LG microwave showing the E error?
In most cases there is no repair cost because the E error is caused by an out-of-range user entry rather than a failed part. If the error persists due to a faulty touchpad, replacement touchpad parts and labor can range from around 50 to 150 dollars depending on the model and service provider. A full control board replacement, if needed, would typically cost more.

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