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Error code reference

Whirlpool Microwave Error Code F1:Pr

Software type mismatch in electronic control board.

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Software type mismatch in electronic control board.

First step from the service manual

Unplug microwave oven or disconnect power, then replace electronic control board.

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

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What F1:Pr means on a Whirlpool microwave

The F1:Pr error code on a Whirlpool microwave indicates a software type mismatch within the electronic control board. This fault is detected internally by the control board's firmware when the programmed software type does not match the expected configuration for the specific appliance model. The control board contains embedded software that must correspond precisely to the hardware and model variant it is installed on. When this mismatch is detected, the board flags the F1:Pr fault and prevents normal operation.

This error is not caused by a user-serviceable setting or a transient electrical fault. It originates inside the control board itself, either because the board was replaced with an incompatible unit during a prior repair, because the board's internal memory or firmware became corrupted, or because the board was incorrectly programmed at the factory. Unlike sensor faults or door switch errors, this code points directly to the control board as the source of the problem rather than any external component or wiring.

Because the mismatch is a firmware-level issue residing inside the control board, external resets or power cycling will not resolve it. The board cannot correct its own software type designation. The required repair is full replacement of the electronic control board with a unit that carries the correct software type for the microwave model. Technicians should verify the replacement board is sourced to match the specific model number to avoid reintroducing the same mismatch condition.

Source: manufacturer service documentation.

Common causes of F1:Pr

  1. 01

    Incorrect replacement control board installed

    Part replacement

    A previously installed control board may have been sourced for a different model variant, resulting in a software type that does not match this microwave. Check the model number on the board against the appliance's model number to confirm compatibility.

  2. 02

    Corrupted control board firmware

    Part replacement

    The firmware stored in the control board's memory can become corrupted due to a power surge or electrical anomaly, causing the software type identifier to read incorrectly. This corruption is internal to the board and cannot be repaired externally.

  3. 03

    Factory programming error on control board

    Part replacement

    In some cases, a control board may have left the factory loaded with software intended for a different model variant. This would cause the F1:Pr fault immediately or shortly after installation.

  4. 04

    Control board failure after power surge

    Part replacement

    A voltage spike or power surge can damage the control board's internal memory, causing the stored software type information to become unreadable or mismatched. A surge protector installed after the fact will not resolve existing board damage.

See the test procedure for each cause

Frequently asked questions about F1:Pr

What does F1:Pr mean on a Whirlpool microwave?
F1:Pr indicates a software type mismatch detected within the electronic control board. The board's embedded firmware does not match the expected software type for this appliance. This is an internal board-level fault and not related to any user setting or external component. Replacing the electronic control board is the required repair.
Can I fix the F1:Pr error myself without calling a technician?
The repair requires replacing the electronic control board, which involves working inside the microwave cabinet. Microwave capacitors can retain a lethal electrical charge even after the unit is unplugged, so this repair carries significant safety risk for anyone not trained to discharge high-voltage capacitors. If you are not familiar with microwave internal components, professional service is strongly recommended.
Is it safe to use my Whirlpool microwave while it shows F1:Pr?
The F1:Pr fault indicates the control board has detected an internal mismatch and the microwave should not be relied upon for normal operation while this code is active. The appliance may not function correctly or at all. It is best to leave the microwave unplugged until the control board has been replaced.
Will resetting or unplugging the microwave clear the F1:Pr code?
No, unplugging or resetting the microwave will not clear the F1:Pr error. The fault is a firmware-level software type mismatch stored within the control board itself. Because it is not caused by a transient condition, the error will return immediately when power is restored. Only replacing the control board will resolve the fault.
How much does it cost to repair a Whirlpool microwave with an F1:Pr error?
The total cost depends on the specific model and whether you use professional service or attempt a DIY repair. Control board parts typically range from $75 to $200 or more depending on the model. Professional labor to diagnose and replace the board can add $100 to $200 on top of parts costs. In some cases, especially for older or lower-end models, replacement of the entire microwave may be more cost-effective than a control board repair.

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