Frigidaire Cooktop Error Code E91

E91 indicates an internal generator synchronization error in the 2-cook-zone induction module. The cooktop's control system has detected that the generator circuits powering two of the induction zones have lost synchronization. The unit shuts down to prevent damage to the power electronics. Diagnosis begins with inspecting the cables and connections on the right generator circuit board.

No. When E91 is active, the cooktop disables the affected cook zones to protect the internal electronics from further damage. Attempting to bypass or ignore this fault and continue cooking is not safe. The underlying generator or wiring fault should be diagnosed and repaired before the unit is returned to service.

Repair costs depend on the root cause. If only cable reseating or minor connector work is needed, costs may be limited to a service call fee, typically in the range of $75 to $150. If the right generator circuit board or the induction module requires replacement, parts and labor combined can range from $200 to $500 or more depending on parts availability and local labor rates.

Some cases of E91 are caused by loose cable connections that a knowledgeable DIYer can address after fully disconnecting power to the cooktop. However, if the fault is caused by a failed generator circuit board or induction module, those repairs involve high-voltage components and are best handled by a qualified technician. Never open the cooktop while it is connected to power.

Resetting the cooktop by cycling the power may temporarily clear the E91 display, but the fault will return if the underlying cause has not been resolved. A loose connector that reseats itself temporarily might suppress the code for a short period, but a failed board or damaged wiring will continue to trigger the error. A proper repair addressing the root cause is necessary for a lasting fix.