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Error code reference

Kenmore Microwave Error Code SF

Sabbath mode failure

Kenmore codesKenmore microwave codes

Sabbath mode failure — indicates a power failure occurred during Sabbath mode; the appliance will not automatically restart with original bake settings when power is restored.

First step from the service manual

Re-enter Sabbath mode settings manually after power is restored.

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

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What SF means on a Kenmore microwave

The SF error code on a Kenmore microwave indicates a Sabbath mode failure caused by a power interruption while the unit was operating in Sabbath mode. Sabbath mode is a specialized operating state designed to comply with certain religious observance requirements, allowing the microwave to maintain specific settings continuously over an extended period. When power is lost during this mode, the appliance cannot retain the previous configuration and will not automatically resume those settings once power is restored. Instead, the SF code is displayed to alert the user that manual reconfiguration is required.

The underlying issue is not a hardware failure but rather a software state reset triggered by the power loss. The microwave's control board clears its active Sabbath mode parameters when the power supply is interrupted, since the settings are held in volatile memory during operation. This means no component damage has occurred, and the unit itself remains fully functional. The SF code is purely informational, signaling that the user must re-enter the Sabbath mode settings before the microwave will return to that operating state.

The most common cause is a household power outage, a tripped circuit breaker, or the microwave being unplugged, all of which interrupt power to the control board. Momentary voltage fluctuations or brownouts can also trigger the same result by causing the control board to reset. Because Sabbath mode typically runs for extended periods, even a brief power interruption is enough to clear the settings and generate the SF alert.

Source: manufacturer service documentation.

Common causes of SF

  1. 01

    Power outage or interruption

    Wiring / connection

    A household power outage, even a brief one, clears the Sabbath mode settings stored in the control board's active memory. This is the most frequent trigger for the SF code.

  2. 02

    Tripped circuit breaker

    Wiring / connection

    A tripped breaker on the microwave's dedicated or shared circuit cuts power to the unit and resets the control board state. Check the breaker panel and reset any tripped breaker before re-entering Sabbath mode.

  3. 03

    Microwave unplugged accidentally

    Wiring / connection

    If the microwave was unplugged from the wall outlet while Sabbath mode was active, power to the control board was cut and the settings were lost. Verify the unit is securely plugged in before reconfiguring.

  4. 04

    Voltage fluctuation or brownout

    Wiring / connection

    A momentary drop or spike in household voltage can cause the control board to reset without a full outage. This may be harder to identify but will produce the same SF alert upon power stabilization.

  5. 05

    Control board retaining power issue

    Part replacement

    In rare cases, a failing control board may not retain operating states properly even with stable power. If the SF code appears repeatedly without any power interruption, the control board may need inspection or replacement.

See the test procedure for each cause

Frequently asked questions about SF

What does SF mean on a Kenmore microwave?
The SF code on a Kenmore microwave stands for Sabbath mode failure. It appears when a power interruption occurs while the microwave was running in Sabbath mode, causing the unit to lose its saved settings. The microwave will not automatically restart with the original Sabbath mode configuration after power is restored. The code is informational and does not indicate a hardware malfunction.
How do I fix the SF error code on my Kenmore microwave?
To clear the SF code, simply re-enter the Sabbath mode settings manually after power has been fully restored to the unit. There is no repair needed in most cases, as the error is caused by the control board losing its active settings during a power interruption. Once Sabbath mode is reconfigured, the code should no longer display. If the code returns without any power interruption, consult a technician to evaluate the control board.
Is it safe to use my Kenmore microwave when the SF code is showing?
Yes, the SF code does not indicate a safety hazard or a damaged component. The microwave is fully functional and safe to operate. The code simply means Sabbath mode settings were lost and need to be re-entered. Standard cooking functions are not affected by this alert.
Will resetting my Kenmore microwave clear the SF error code?
A basic reset, such as unplugging the unit for a minute and plugging it back in, will clear the displayed code but will not restore the Sabbath mode settings. You will still need to manually re-enter those settings afterward. If the SF code reappears after each power cycle without any outage occurring, there may be an issue with the control board that requires further diagnosis.
How much does it cost to repair a Kenmore microwave showing the SF code?
In most cases, no repair cost is involved because the SF code is caused by a power interruption rather than a faulty component. Re-entering Sabbath mode settings yourself costs nothing. If the code is caused by a failing control board, replacement part and labor costs can range from roughly 100 to 300 dollars or more depending on the model and service provider. It is worth confirming the root cause before committing to a repair.

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