Hi bsful1 - Typically, E91 indicates that the main control board has gone bad or is not communicating correctly. Before replacing this part, I would first recommend resetting power to the unit for about ten minutes. If the error code still displays, it is advisable to contact an appliance repair tech to accurately diagnose and make the appropriate repairs.
Hello - Typically error code E91 on Frigidaire washer indicates a communication error with the user interface to main control board. A certified technician will need to check the wiring between both parts. Either part could be defective or unit may possibly have faulty wiring. Depending on the diagnostic either or will need replacing.
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