Written by
Hannah Ostrowski Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeE91
ApplianceWasher
A display reading E91 means the washer’s UI board and its control board have lost their communication link.
Where the code is documented
Front-load tech sheets: FAFW3577KA, FAFS4272LR and EWFLS70JRR
Top-load washers list E91 too
Technician check, not an owner job
All of the sheets answer E91 with a numbered communication test meant for a technician, and the test on the FAFW3577KA sheet differs from the one on the later sheets. Before anyone looks the washer over, it makes sense to disconnect it from power.
E9B: microprocessor and external EEPROM communication
Bay Area service for E91
For Frigidaire washer service in San Francisco and around the Bay Area, see Frigidaire washer repair or call (415) 319-6371. Mention E91 and the washer model number, and say what you have already tried.
Model compatibility: Frigidaire reuses codes across series and model years, so E91 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The UI board and the control board have a communication fault.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Frigidaire appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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