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Error code reference

Whirlpool Microwave Error Code ERR 9

Options were not correctly selected.

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Options were not correctly selected.

First step from the service manual

Check by re-selecting options.

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

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What ERR 9 means on a Whirlpool microwave

ERR 9 on a Whirlpool microwave indicates that the control system detected an invalid or incomplete options selection during a cooking or feature setup cycle. The error originates in the control board's input validation logic, which monitors user selections for proper sequence, compatibility, and completeness. When the board determines that the entered options do not meet the required parameters for a given cooking mode, it halts the operation and displays ERR 9 to prevent an undefined or potentially unsafe cooking cycle from executing.

This error is most commonly a user-input issue rather than a hardware failure. Conflicting settings, such as selecting incompatible power levels or cook modes simultaneously, can trigger the validation check to fail. Incomplete entries where a required step in the option selection sequence was skipped are another frequent cause. The control board expects a specific logical order of inputs, and deviating from that sequence will produce this error.

Before assuming a component failure, the recommended first step is to clear the current selection and re-enter the desired options from the beginning, following the correct sequence for the intended cooking function. If the error persists across multiple correct input attempts, the touchpad membrane or the main control board may be contributing to erroneous input signals. A faulty key panel can send ghost inputs or fail to register selections accurately, causing the board to see an invalid options state even when the user's input appears correct.

Source: manufacturer service documentation.

Common causes of ERR 9

  1. 01

    Incorrect or incomplete option entry sequence

    Wiring / connection

    The most common cause is skipping a required step or entering settings out of order. Cancel the current operation and re-select all options from the beginning, following the correct sequence for the chosen cooking mode.

  2. 02

    Incompatible cooking options selected together

    Wiring / connection

    Certain combinations of power levels, cook modes, or timer settings conflict with each other and will fail the control board's validation check. Review which options are compatible with the selected cooking function before re-entering them.

  3. 03

    Faulty or worn touchpad membrane

    Part replacement

    A degraded touchpad can send incorrect or duplicate signals to the control board, causing the board to register an invalid selection even when the user input is correct. Inspect the keypad for unresponsive keys, keys that stick, or inconsistent behavior.

  4. 04

    Control board input processing error

    Wiring / connection

    A temporary glitch in the main control board's logic can cause it to misread valid inputs as an improper options selection. Disconnecting power to the microwave for several minutes and then restoring power can sometimes reset the board's logic state.

  5. 05

    Failing main control board

    Part replacement

    If the error appears consistently across multiple correct input attempts after a power reset, the main control board may have a hardware fault affecting its ability to process user selections accurately. This would require board replacement.

See the test procedure for each cause

Frequently asked questions about ERR 9

What does ERR 9 mean on a Whirlpool microwave?
ERR 9 means the microwave's control board detected that the cooking options were not correctly selected. The board validates user inputs for proper sequence and compatibility before allowing a cycle to run, and this error appears when that validation fails. It is most often caused by a skipped step or conflicting settings in the option entry process.
How do I fix ERR 9 on my Whirlpool microwave?
Start by pressing Cancel or Clear to exit the current input sequence, then re-enter your cooking options carefully from the beginning, making sure to follow the correct order for the mode you are using. Avoid combining incompatible settings such as conflicting power levels and cook modes. If the error persists after correct re-entry, try unplugging the microwave for a few minutes to reset the control board, then attempt the selection again.
Is ERR 9 on a Whirlpool microwave a safety concern?
ERR 9 is generally not a safety hazard. The error indicates the microwave refused to start a cooking cycle because the selected options were invalid, which is the control system working as intended to prevent undefined operation. The unit should remain safe to use once valid options are correctly entered.
Will resetting my Whirlpool microwave clear the ERR 9 code?
A reset can clear ERR 9 if the error was caused by a temporary control board glitch. Unplug the microwave or trip its circuit breaker for two to five minutes, then restore power. If the underlying cause is incorrect user input or a faulty touchpad, the error will return unless the input issue is also resolved.
How much does it cost to repair a Whirlpool microwave showing ERR 9?
If the error is caused by user input, there is no repair cost. If the touchpad membrane needs replacement, parts and labor typically range from around 50 to 150 dollars depending on the model and service provider. A main control board replacement is more involved and can range from roughly 100 to 300 dollars or more, at which point evaluating the age of the microwave against repair cost is worthwhile.

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