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F6E3

F6E3 - No communication from MCU to ACU

Whirlpool · Diagnostic Mode

What does F6E3 mean?

The ACU (Appliance Control Unit) is not receiving communication signals from the MCU (Main Control Unit). This indicates a critical internal communication failure.

Common Causes

  • MCU or wiring issue
  • ACU problem

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check ACU power (Refer to TEST #1 in manual).

  2. 2

    Replace the ACU.

Browse all codes in this manual (51)
Verified technical data. Last updated: April 2026

Related Faults

888 or 88Display Shows 888 or 88 — No Saved Fault CodesACU Power Check FailACU Power Check Failure — Power or Connection IssueClean Washer LED flashing at end of wash cycleClean Washer LED Flashing — Reminder to Run Clean Cycle
Source: Whirlpool Diagnostic Mode
Open Manual (Page 8)Search more codes in this manual