AEG Washer Error Code E91

E91 indicates a reading error from the program selector caused by incorrect configuration data. The main control board is unable to correctly interpret the signals coming from the selector dial. This prevents the washer from identifying which cycle has been chosen, so the machine halts operation and displays the fault code.

A power reset is unlikely to permanently resolve E91 because the fault is tied to incorrect configuration data or a hardware failure in the electronics. The error may temporarily clear after a reset, but it will return if the underlying component fault is not addressed. Replacement of the faulty electronics is the correct repair path.

Repair costs depend on which component has failed. A replacement main control board typically ranges from $80 to $250 for the part alone, while a program selector assembly generally costs between $20 and $80. Adding professional labor, total repair costs can range from $150 to $400 or more depending on your location and the specific parts required.

Resolving E91 typically requires replacing electronic components, which is a moderately advanced repair. A knowledgeable DIYer comfortable with appliance disassembly and component swapping may be able to replace the control board or program selector. However, correctly diagnosing which component is at fault can be difficult without experience, so a qualified technician is recommended if you are unsure.

When E91 is active, the washer cannot reliably determine which program has been selected, so running a cycle is not advisable. The machine may not operate as expected, and continuing to use it before the fault is resolved could complicate diagnosis. It is best to leave the washer unplugged until the repair is completed.