Electrolux Washer Error Code E91 — Communication Error Between Boards
What this means
The E91 error code on Electrolux washers indicates a communication failure between the main electronic control board (located in the back) and the user interface board (behind the control panel). This can be caused by a faulty ribbon cable or wiring harness, a failed main control board, a failed UI board, or a power surge that damaged the communication circuit.
Alternate codes: E 91
Step-by-step fix
4 stepsPower cycle the washer
Unplug the washer for 10 minutes to fully discharge the capacitors on both boards. Plug it back in and see if the washer powers up normally. Power surges can cause temporary communication errors.
Consider plugging the washer into a surge protector after repair to prevent future power surge damage.
Check the communication cable
Remove the top panel and the control panel housing. Locate the ribbon cable or wire harness connecting the UI board to the main board. Unplug and firmly reseat both ends. Inspect for any bent pins, corrosion, or damage.
Take a photo of the cable connections before disconnecting so you can reference the correct orientation.
Inspect both boards for damage
Visually inspect both the main control board and the UI board for burn marks, swollen capacitors, water damage, or cracked solder joints. Any visible damage indicates the affected board needs replacement.
Water sometimes drips onto the main board from the detergent dispenser hose — check for corrosion around connectors.
Replace the faulty board
If reseating the cable does not fix the issue, replace the board that shows visible damage. If neither shows visible damage, the main control board is statistically more likely to be the culprit.
When ordering a replacement board, check if the new board needs to be programmed with your model's configuration.
When to call a professional
Control board diagnosis and replacement can be tricky — call a professional if you're unsure which board has failed or if the replacement board requires programming.
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
Main Control Board
Part #137275300 · $150–$280
If main board shows damage or communication still fails after cable check
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