Frigidaire · Washer Moderate

E91 — UI EEPROM checksum failure

The user interface board's saved settings are corrupted. The washer may revert to defaults or refuse to start.

Keep using it?
Yes, with caution
DIY difficulty
Hard
Verified against
frigidaire.com ↗

How to fix it

  1. Unplug for 10 minutes — sometimes clears soft corruption.
  2. Attempt the model's factory reset sequence per the tech sheet.
  3. If E91 persists, replace the UI board.
  4. Use a surge protector to prevent recurrence.

Why it happens

Typical signs: E91 at power-on · Settings won't save · Display behaves erratically

  • Power surge corrupted EEPROM Lightning or grid event scrambled saved data.
  • Failing UI memory chip EEPROM at end of write-cycle life.
  • Aborted firmware update Power lost mid-update during service.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Frigidaire UI control board Common replacement
    Amazon →
  • Whole-house or appliance surge protector Common replacement
    Amazon →

More Frigidaire washer codes

E10 E10 — Water fill problem E11 E11 — Fill time too long E13 E13 — Water leak or air leak in pressure system E20 E20 — Drain pump won't pump out E21 E21 — Slow drain / water remains in tub E23 E23 — Drain pump relay fault on control board

All Frigidaire codes → All washer codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: frigidaire.com.