Frigidaire Washer Error Code E91 — Communication Error Between UI and Main Board
What this means
The E91 error code on Frigidaire washers indicates a communication failure between the user interface (UI) board behind the control panel and the main electronic control board (typically at the rear or bottom of the washer). A loose wire harness, corroded connectors, a power surge, or a failed board can cause this error. The washer may not respond to button presses or may display erratic behavior.
Alternate codes: E 91
Step-by-step fix
4 stepsReset the washer
Unplug the washer for 10 minutes. Plug it back in and check if the display responds and the washer accepts cycle selections.
A momentary power spike can cause a communication glitch. A full reset often resolves it.
Check the wire harness between boards
Unplug the washer. Remove the control panel cover to access the UI board. Locate the wire harness running to the main board and check both connector ends for secure seating. Disconnect and reseat each connector.
Vibration during spin cycles can loosen connectors over time.
Inspect connectors for corrosion
Look at the connector pins on both boards for green/white corrosion deposits. Clean with electrical contact cleaner and a soft brush if corrosion is present.
Corrosion on the UI board connector often comes from steam entering through gaps in the control panel.
Replace the faulty board
If reseating and cleaning do not resolve the error, one of the boards has failed. Replace the UI board first (more common failure). If the error persists, the main control board is the problem.
Order the exact replacement part number from the label on the existing board.
When to call a professional
If both boards need diagnosis or you cannot identify which board has failed, a technician with diagnostic tools can test each board independently.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
User Interface Board
Part #137006030 · $70–$140
If the UI board shows damage or does not communicate after connector reseat
Main Electronic Control Board
Part #137208014 · $120–$240
If the main board fails to communicate after UI board replacement
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