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Error code reference

KitchenAid Microwave Error Code F8

Meat probe shorted (function not used).

KitchenAid codesKitchenAid microwave codes

Meat probe shorted (function not used).

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What F8 means on a KitchenAid microwave

The F8 error code on a KitchenAid microwave indicates a malfunction within the electronic control board itself. The control has detected an internal fault that prevents normal operation. This is not a sensor failure or a peripheral component issue reported back to the control; the control board is the source of the fault. The standard service procedure is direct replacement of the control board, as internal component-level repair of the board is not supported by KitchenAid.

For homeowners, the electronic control board is the brain of the microwave. It manages every function, including cook time, power levels, the display, and safety interlocks. When it malfunctions and throws an F8, the microwave typically becomes non-functional or behaves erratically. Power cycling the unit by unplugging it for 60 seconds can occasionally clear a temporary fault, but if F8 returns, the control board has failed and needs to be replaced.

Before replacing the control board, it is worth confirming that the wiring harness connections to the board are fully seated and undamaged, since a loose or corroded connector can mimic an internal board failure. If connections are intact and the error persists, board replacement is the correct next step.

Source: manufacturer service documentation.

Common causes of F8

  1. 01

    Failed electronic control board

    Part replacement

    The control board itself has suffered an internal failure, such as a burned component, failed microprocessor, or damaged circuit trace. This is the primary cause indicated by F8 and requires replacing the board.

  2. 02

    Loose or corroded wiring harness connector at the control board

    Wiring / connection

    A wiring harness connector that has worked loose or developed corrosion can disrupt communication to the control board, triggering an F8 fault. Reseating or replacing the connector may resolve the error without replacing the full board.

  3. 03

    Power surge damage to the control board

    Part replacement

    A voltage spike from a power surge can damage the control board's internal circuitry and cause a permanent F8 fault. A surge-damaged board will not recover after power cycling and must be replaced.

  4. 04

    Moisture or grease contamination on the control board

    Part replacement

    Over-range microwaves can accumulate grease or condensation that reaches the control board, causing short circuits or component corrosion that triggers F8. If contamination is present and the board shows visible damage, replacement is required.

See the test procedure for each cause

Frequently asked questions about F8

What does F8 mean on a KitchenAid microwave?
F8 on a KitchenAid microwave means the electronic control board has detected an internal malfunction. The control board is reporting a fault with itself rather than with another component like the magnetron or door switches. The standard fix is to replace the electronic control board.
How do I fix the F8 error code on my KitchenAid microwave?
Start by unplugging the microwave for 60 seconds to allow the control to reset. If F8 returns when power is restored, inspect the wiring harness connectors at the control board and reseat any that are loose. If the error persists after those steps, the electronic control board needs to be replaced. Locate the correct part number for your model using the full model number printed on the inside door frame.
Is it safe to use my KitchenAid microwave while the F8 code is active?
No. With an active F8 error, the electronic control board is malfunctioning and the microwave should not be used. A failed control board can cause unpredictable behavior, including failure of the safety interlocks that prevent the magnetron from running with the door open. Discontinue use until the control board has been inspected and replaced.
How much does it cost to fix an F8 error on a KitchenAid microwave?
The electronic control board for a KitchenAid microwave typically costs between $80 and $200 depending on the model. If you hire a technician, expect to add $100 to $200 in labor, bringing the total repair to roughly $180 to $400. For microwaves on the lower end of that cost range, comparing the repair cost to the price of a replacement unit is a reasonable consideration.
Can I replace the KitchenAid microwave control board myself to fix F8?
Control board replacement is a manageable DIY repair for someone comfortable working with appliances. You will need to disconnect power, discharge the high-voltage capacitor before working near any internal components, and carefully document connector locations before removing the old board. The capacitor inside a microwave can retain a lethal charge even when unplugged, so discharging it properly is a required step, not optional. If you are not confident with this procedure, a qualified appliance technician should perform the repair.

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