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F4E1

F4E1 - Wash heater relay error or no feedback signal

Whirlpool · Diagnostic Mode

What does F4E1 mean?

The ACU cannot detect a temperature increase from the wash heater, indicating a problem with the heater relay or its feedback signal.

Common Causes

  • Wash heater relay fault
  • Wash heating element not working
  • Wiring issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wash heating element (Refer to TEST #9a in manual).

  2. 2

    Inspect wiring connections related to the wash heater.

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