Service Flash from Electrolux on the 30″ Frigidaire Free-Standing Ranges with lower mini oven and warmer drawer combination:

Beeping sound coming from the control panel area with no fault code displayed in the Electronic Oven Control (EOC). The consumer can set the oven lock out feature and the beeping stops.

Possible open or shorted mini oven sensodprobe circuit, or mini oven control. The mini oven control will beep constantly when it detects a fault condition in the temperature sensor/probe circuit. This may be caused by a runaway heat condition, open or shorted temperature sensor/probe, or faulty sensor/probe connection or harness.

The technician should test the temperature sensor/probe circuit by disconnecting the P3 connector at the mini oven control board and then measuring the resistance between the two purple wires. The resistance of the mini oven temperature sensor probe should read the same as that of the main oven temperature sensor/probe. If the sensor/probe circuit and harness are good, then replace the mini oven control board.

Thanks to our forum moderator, Pegi, for sharing this with us.