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Error code reference

Frigidaire Microwave Error Code LOCK

Indicates the Child Lock feature is active and the control panel is deactivated; displayed when any pad is…

Frigidaire codesFrigidaire microwave codes

Indicates the Child Lock feature is active and the control panel is deactivated; displayed when any pad is touched while locked.

First step from the service manual

To cancel, touch Timer/Clock, the number 1 and Clear/Off pad.

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

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What LOCK means on a Frigidaire microwave

The LOCK display on a Frigidaire microwave indicates that the Child Lock feature has been activated, which fully deactivates the control panel to prevent unintended operation. This is a software-controlled lockout state managed by the microwave's control board. When the unit is in this state, pressing any pad on the control panel will cause the LOCK indicator to appear rather than executing any command. The microwave itself remains powered and functional, but all user inputs are ignored until the lock is properly disengaged.

The Child Lock is an intentional safety feature, not a fault or malfunction. It is typically engaged by a specific key sequence or by holding a designated button, and it persists through normal use cycles, meaning it will not clear on its own if the door is opened or the cooking cycle times out. In some cases, a brief power interruption may or may not reset the lock state depending on how the control board retains its settings.

To cancel the Child Lock on a Frigidaire microwave, the required sequence is: touch the Timer/Clock pad, then touch the number 1 pad, then touch the Clear/Off pad. This three-step sequence is specific and must be performed in order. If the control panel does not respond to this sequence, the control board or membrane keypad may have an underlying issue that should be investigated separately.

Source: manufacturer service documentation.

Common causes of LOCK

  1. 01

    Child Lock accidentally activated

    Wiring / connection

    The most common reason for the LOCK display is that the Child Lock was triggered unintentionally, often by pressing buttons in a sequence that activates the feature without the user realizing it. This requires no parts and is resolved by entering the unlock sequence.

  2. 02

    Child Lock deliberately set and forgotten

    Wiring / connection

    Another household member may have enabled the Child Lock intentionally and not communicated this to others. The microwave is operating normally and only needs the unlock key sequence entered.

  3. 03

    Control board retaining lock state after power event

    Wiring / connection

    A brief power fluctuation or outage may cause the control board to resume in a locked state if the lock was active before power was lost. Entering the unlock sequence should resolve this.

  4. 04

    Faulty membrane keypad

    Part replacement

    If the unlock sequence is entered correctly but the LOCK indicator persists or the panel remains unresponsive, the membrane keypad may have a damaged or shorted key contact that is registering unintended inputs. A replacement keypad would be required.

  5. 05

    Control board malfunction

    Part replacement

    In rare cases, the control board may fail to process the unlock sequence correctly, keeping the unit locked regardless of user input. This would point to a defective control board requiring replacement.

See the test procedure for each cause

Frequently asked questions about LOCK

What does LOCK mean on a Frigidaire microwave?
LOCK on a Frigidaire microwave means the Child Lock feature is active and the control panel has been deactivated. When this feature is on, pressing any button will display LOCK instead of performing a function. This is a safety feature, not an error or malfunction. It can be cleared by entering a specific three-button sequence.
How do I fix the LOCK display on my Frigidaire microwave?
To disable the Child Lock, press the Timer/Clock pad, then the number 1 pad, then the Clear/Off pad in that order. The LOCK indicator should disappear and the control panel will return to normal operation. If this sequence does not work, verify you are pressing the pads in the correct order without pausing too long between inputs.
Will unplugging my Frigidaire microwave clear the LOCK code?
Unplugging the microwave may or may not clear the Child Lock depending on how the control board stores the lock state. The recommended and reliable method is to use the proper unlock sequence: Timer/Clock, then 1, then Clear/Off. Relying on a power reset is not guaranteed to work and the lock may return when power is restored.
Is the LOCK display on my Frigidaire microwave a safety concern?
No, the LOCK display is not a safety concern. It means the Child Lock feature is active, which is a built-in function designed to prevent accidental use. The microwave is not broken and poses no hazard in this state. Simply enter the unlock sequence to restore normal operation.
How much does it cost to repair a Frigidaire microwave that is stuck on LOCK?
If the LOCK display clears after entering the correct key sequence, there is no repair cost at all. If the control panel remains unresponsive after the correct sequence is entered, the issue may involve a faulty membrane keypad or control board. Keypad replacements typically range from $20 to $80 in parts, while control board replacements can range from $60 to $200 or more depending on the model, not including labor if a technician is hired.

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