Frigidaire Range Error Code F66

F66 indicates an internal power supply failure within the Electronic Oven Control (EOC) board. The EOC has detected that its internal power supply circuitry is not functioning correctly. This fault prevents normal oven operation and requires either a power cycle reset or replacement of the EOC board.

You should not attempt to use the range while the F66 fault is active. The EOC controls critical oven functions including temperature regulation, and a failure in its internal power supply means the oven cannot operate reliably or safely. Disconnect power until the issue is diagnosed and resolved.

A knowledgeable DIYer comfortable working with appliance electronics can replace the EOC board. However, the range must be fully disconnected from power before beginning any work. It is important to confirm the exact replacement part number for your specific model before ordering, as EOC boards are not universal across Frigidaire range models.

A reset may clear the code if the fault was caused by a temporary power event. Disconnect the range from power for at least 30 seconds, then restore power. If the F66 code returns immediately after power is restored, the EOC board has a hardware failure and must be replaced.

If the EOC board requires replacement, parts typically cost between $150 and $350 depending on the specific model. Professional labor to diagnose and replace the board generally adds another $100 to $200. A power cycle that clears the fault would cost nothing, but if the code returns, board replacement is the required repair.