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Error code reference

Electrolux Microwave Error Code LOCK ON

Displayed when the Child Lock feature is active and a control panel pad is touched, indicating the control…

Electrolux codesElectrolux microwave codes

Displayed when the Child Lock feature is active and a control panel pad is touched, indicating the control panel is deactivated.

First step from the service manual

Touch user pref and START pad to cancel the Child Lock.

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

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What LOCK ON means on a Electrolux microwave

The LOCK ON display on an Electrolux microwave is not an error code in the traditional sense. It is a status indicator that appears when the Child Lock feature has been activated on the unit. When Child Lock is enabled, the control panel is fully deactivated, meaning no cooking functions, timer settings, or other pad inputs will register. The microwave is intentionally locked to prevent unintended or unsupervised operation. Any time a control panel pad is pressed while Child Lock is active, the display responds with LOCK ON to inform the user of the panel's current state.

The Child Lock function is a built-in software-level feature controlled through the microwave's control board and panel interface. No components are damaged or malfunctioning when LOCK ON appears. The feature is toggled through a specific key sequence involving the user preferences pad and the START pad. This is entirely a user-configurable setting, not a fault condition that indicates hardware failure.

To clear the LOCK ON status and restore normal panel operation, touch the user pref pad followed by the START pad. This sequence disables the Child Lock and returns the control panel to its active state. If the panel does not respond after this sequence, confirm that the microwave is receiving power and that the door is fully closed, as some models require the door to be shut before accepting panel input.

Source: manufacturer service documentation.

Common causes of LOCK ON

  1. 01

    Child Lock intentionally activated

    Wiring / connection

    The most common reason for LOCK ON is that a household member deliberately turned on the Child Lock feature. This is the expected behavior of the function and requires no repair.

  2. 02

    Child Lock accidentally activated

    Wiring / connection

    The Child Lock can be triggered accidentally if certain pad sequences are pressed unintentionally, such as during cleaning or while leaning against the panel. The fix is the same: press user pref and then START to deactivate it.

  3. 03

    Control panel pad malfunction causing unintended lock activation

    Part replacement

    In rare cases, a stuck or shorted control panel pad could trigger the Child Lock sequence without deliberate input. If the lock re-engages on its own repeatedly, inspect the control panel for physically stuck buttons.

  4. 04

    Control board retaining lock state after power interruption

    Wiring / connection

    Some microwaves retain user settings including Child Lock through power cycles. If the lock was active before a power outage, it may still be enabled when power is restored. The standard deactivation sequence will clear it.

See the test procedure for each cause

Frequently asked questions about LOCK ON

What does LOCK ON mean on a Electrolux microwave?
LOCK ON means the Child Lock feature is currently active on your Electrolux microwave, which disables the entire control panel. This is a built-in safety function designed to prevent unintended operation. It is not an error or a sign of a malfunction. Pressing user pref and then START will deactivate the Child Lock and restore normal operation.
How do I fix the LOCK ON display on my Electrolux microwave?
To clear LOCK ON, touch the user pref pad on the control panel and then press the START pad. This key sequence disables the Child Lock feature and re-enables all control panel functions. If the display does not change after this sequence, ensure the microwave is properly plugged in and the door is fully closed before trying again.
Is it safe to use my Electrolux microwave when LOCK ON is displayed?
The microwave itself is not damaged or in an unsafe condition when LOCK ON is displayed. The appliance is simply locked and will not accept any cooking commands until the Child Lock is deactivated. Once you clear the lock using the user pref and START sequence, the microwave will operate normally.
Will resetting or unplugging my Electrolux microwave clear the LOCK ON message?
Unplugging the microwave may not clear the Child Lock, as many Electrolux models retain user settings including the lock state through power cycles. The correct way to clear LOCK ON is to use the designated deactivation sequence: press user pref followed by START. Relying on a power reset alone may result in LOCK ON reappearing when the unit powers back on.
Do I need a technician or replacement parts to fix the LOCK ON message?
In nearly all cases, no technician or parts are needed to resolve LOCK ON. The condition is cleared through a simple button sequence on the control panel. Parts or professional service would only be relevant if a physically damaged or stuck control panel pad is causing the lock to activate on its own repeatedly, in which case control panel replacement costs typically range from $50 to $150 depending on the model.

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