Kenmore Elite 721 model electric range

Unplug the range and measure the resistance of the upper oven temperature sensor. You should measure 1,090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the upper oven temperature sensor.

The code displays on the affected control display (oven or cooktop control display). For the cooktop control, unplug the range and check the ribbon wire connection between the control panel and the cooktop control board. If the F3 appears on the oven control, unplug the range and check the control panel ribbon wire connection on the oven control board. Reconnect the ribbon wire to the affected control if loose. If the ribbon wire connection is okay, press all keys on the affected control from different angles to free up the stuck key. Reassemble the range and plug it back in to restore power. If the code resumes, try this test. Unplug the range and disconnect the ribbon wire from the affected control. Reassemble the range and plug it back in to restore power. If the code appears with the ribbon wire unplugged, replace the affected control board because it's detecting a stuck key with the control panel unplugged. If the code doesn't appear with the ribbon wire unplugged, replace the control panel.

Unplug the range and measure the resistance of the lower oven temperature sensor. You should measure 1,090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the lower oven temperature sensor.

The control senses upper oven temperature above 650 degrees F in bake or broil modes. Unplug the range. If the code appears when the oven is at room temperature, measure the resistance of the upper oven temperature sensor. You should measure 1,090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the upper oven temperature sensor. If the oven is overheating when the code appears, then you'll likely need to replace the oven control board because a stuck relay on the control board is causing the overheating.

A voltage supply problem could prevent all elements in the range from heating. See if the lower oven elements and surface burners heat. If no elements heat, check the house circuit breakers because the range may be getting only 120 volts instead of the 240 volts needed to power the heating elements. Reset both circuit breakers for the range because it's often difficult to tell whether a breaker tripped. If the range elements don't heat after resetting the breakers, unplug the range and check the power cord wire connections on the terminal block. Reconnect any loose wires. Replace the power cord if you find damage. If you find no problems with the power cord or circuit breakers, then you'll likely need to have a service technician diagnose and repair the problem because the technician will need to perform live voltage checks that are dangerous if not performed correctly. If only the upper oven elements won't heat, unplug the range and check the wire harness connections between the upper bake element and the relay control board. Reconnect any loose wires and repair any broken wires. Measure the resistance of the upper bake element using a multimeter. You should measure near 27 ohms of resistance through the upper bake element. Replace the bake element if you measure infinite resistance. If the upper bake element is okay and you find no wiring problems, check the resistance of the upper oven temperature sensor. You should measure 1090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the upper oven temperature sensor.

Unplug the range and check the wire harness connections between the upper oven door lock motor and the relay control board. Reconnect any loose wires and repair any broken wires. Check the wire harness connections between the door lock switches and the oven control board. Reconnect any loose wires and repair any broken wires. Measure the resistance of the upper oven door lock motor using a multimeter. You should measure about 2,600 ohms. Replace the upper oven door lock assembly if you measure infinite resistance.

Unplug the range and check the wire harness connection between the oven control board and cooktop control board. Reconnect any loose wires and repair any broken wires. If the wire connections are okay, reset the oven control board by pressing Lower Stop, holding down the Lower Bake and Lower Broil keys for 3 seconds, pressing Lower Stop, then pressing and holding Lower Bake and Lower Broil again for 3 seconds. If the code returns, replace the oven control board then reset the oven control board using the above procedure. If the code returns again, replace the cooktop control board and reset the oven control using the above procedure.

The control senses lower oven temperature above 650 degrees F in bake or broil modes. Unplug the range. If the code appears when the oven is at room temperature, measure the resistance of the lower oven temperature sensor. You should measure 1,090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the lower oven temperature sensor. If the oven is overheating when the code appears, then you'll likely need to replace the oven control board because a stuck relay on the control board is causing the overheating.

A voltage supply problem could prevent all elements in the range from heating. See if the upper oven elements and surface burners heat. If no elements heat, check the house circuit breakers because the range may be getting only 120 volts instead of 240 volts. Reset both circuit breakers for the range because it's often difficult to tell whether a breaker tripped. If the range elements don't heat after resetting the breakers, unplug the range and check the power cord wire connections on the terminal block. Reconnect any loose wires. Replace the power cord if you find it damaged. If you find no problems with the power cord or circuit breakers, then you'll likely need to have a service technician diagnose and repair the problem because the technician will need to perform live voltage checks that are dangerous if not performed correctly. If only the lower oven elements won't heat, unplug the range and check the wire harness connections between the lower bake element and the relay control board. Reconnect any loose wires and repair any broken wires. Measure the resistance of the lower bake element using a multimeter. You should measure near 22 ohms of resistance through the lower bake element. Replace the bake element if you measure infinite resistance. If the lower bake element is okay and you find no wiring problems, check the resistance of the lower oven temperature sensor. You should measure 1,090 ohms at room temperature (77 degrees F). If resistance is off by more than 100 ohms, replace the lower oven temperature sensor.

Unplug the range and check the wire harness connections between the lower oven door lock motor and the relay control board. Reconnect any loose wires and repair any broken wires. Check the wire harness connections between the door lock switches and the oven control board. Reconnect any loose wires and repair any broken wires. Measure the resistance of the lower oven door lock motor using a multimeter. You should measure about 2,600 ohms. Replace the lower oven door lock assembly if you measure infinite resistance.