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Error code reference

Whirlpool Range Error Code F6E4

Oven User Interface UI and ACU state status mismatch-the UI and ACU status do not match within 60 seconds of the fault condition.

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What the F6E4 error code actually means

The F6E4 error means the two main computer boards inside your range have lost their ability to communicate properly and are no longer in agreement about what the appliance should be doing. Think of it like two people trying to coordinate a task but sending each other conflicting messages. This is often triggered by a brief power fluctuation or a wiring issue, but it can also point to a failing control board that needs professional diagnosis.

Diagnostic procedure

The full F6E4 procedure

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1
First diagnostic step
Record and clear error, exit diagnostic screen, power cycle, and check that the range is working by trying Bake, Broil cycle, and turning on/off the light.
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Most common causes of F6E4

Ranked by how often they cause this code
  1. 1Temporary communication glitch between UI and ACU
  2. 2Faulty or loose wiring harness between UI board and ACU
  3. 3Failed User Interface (UI) board
  4. 4Failed Appliance Control Unit (ACU)

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Questions people ask about F6E4

What does error code F6E4 mean on a Whirlpool range?
F6E4 means the User Interface board and the Appliance Control Unit are reporting mismatched operational states, specifically on Whirlpool ranges with an Indigo control system. The two control modules are not agreeing on the current operating state of the range. This can be caused by a power glitch, a loose wiring connection, or a failed UI board or ACU.
Can I still use my Whirlpool range if it's showing F6E4?
If you clear the error, power cycle the range, and Bake, Broil, and the oven light all function normally during testing, the range is likely safe to use temporarily. However, if the error returns during operation or any function behaves unexpectedly, stop using the range until the underlying cause is diagnosed. A persistent UI-to-ACU communication fault can lead to unpredictable control behavior.
Why does F6E4 keep coming back on my Whirlpool range after I clear it?
A recurring F6E4 after power cycling means the error is being triggered by an actual hardware fault rather than a temporary glitch. The most common culprits are a damaged or intermittently connected wiring harness between the UI and ACU, a failing UI board, or in less common cases, a failing ACU. Check all connectors on the harness first, as a loose connector is a cheaper fix than replacing a control board.
How do I fix F6E4 on a Whirlpool range?
Start by recording the code, then clear it and exit the diagnostic screen. Power cycle the range by turning off the breaker for 60 seconds and restoring power. After the range restarts, test Bake, Broil, and the oven light to confirm normal operation. If F6E4 returns, inspect the wiring harness between the UI board and the ACU for loose or damaged connections. Persistent recurrence after reconnecting the harness points to a failed UI board or ACU that will need to be replaced.
How much does it cost to fix F6E4 on a Whirlpool range?
If the error clears with a power cycle and does not return, the fix costs nothing. If the wiring harness needs replacement, parts typically run $20 to $60. A replacement UI board for an Indigo control system generally costs $100 to $250 for the part alone, and an ACU can range from $150 to $350. Professional labor adds $75 to $150 per hour depending on your area. DIY replacement of the UI board or harness is feasible if you are comfortable working with appliance electronics and following a wiring diagram.

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