Electrolux Dryer Error Code E91 — Communication Error
What this means
The E91 error code on Electrolux dryers indicates a communication failure between the main electronic control board and the user interface (UI) board. The dryer may display this code and become unresponsive to button presses. Causes include a damaged communication cable, a failed control board, a failed UI board, or a power surge that corrupted the communication protocol.
Alternate codes: E 91
Step-by-step fix
4 stepsPower cycle the dryer
Unplug the dryer for 10 minutes. This allows both boards to fully discharge and reset. Plug back in and see if the display responds normally.
Power surges during storms are a common trigger for communication errors between boards.
Reseat the communication cable
Remove the top panel to access the control boards. Locate the ribbon cable or wire harness connecting the two boards. Unplug both ends, inspect for damage, and firmly reseat the connections.
Look for bent pins or corrosion on the connectors.
Check both boards visually
Inspect the main control board and UI board for any burn marks, cracked solder joints, water damage, or swollen capacitors. Any visible damage indicates which board needs replacement.
Sometimes moisture from steam can condense on the boards. Look for white or green corrosion around component leads.
Replace the faulty board
If the cable is good but the error persists, replace the damaged board. If neither shows visible damage, replacing the main control board is the most common fix.
Write down all wire positions before disconnecting the old board.
When to call a professional
Board-level diagnosis can be complex. If power cycling and reseating the cable don't resolve the issue, a technician can test both boards with diagnostic tools.
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 #137207100 · $150–$280
If board shows damage or communication fails after cable check
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