When performing repairs on major home appliances, it's important to take all of the necessary safety precautions. Troubleshooting the keytail on a Kenmore residential range requires partially disassembling the appliance cabinet to expose the wiring and control board components. To avoid serious electrical injury, unplug the range from the wall outlet and switch off the corresponding circuit breaker while servicing the appliance.
You can access the keytail ribbon and electronic control board by removing the upper service panel on the back of the range. If the keytail is unplugged, inspect the locking tabs and prongs for possible damage before plugging it back into the control board wiring harness. Detach the keytail and examine it for damage if it was still attached to the control board. Once you've ensured that the keytail is connected and properly seated, restore the electrical supply and attempt to operate the appliance. Repeat the process if the range continues to display the "E1 F2" error message.
The range may display the same keytail error message if any of the related parts, such as the electronic control board or keypad, are too damaged to sense the keytail. Replace these components if the error message doesn't go away after connecting and disconnecting the keytail two or three times. You can obtain replacement parts for your range directly from Kenmore or from a Kenmore-authorized appliance parts retailer.
Don't go to the trouble of servicing your range if you don't have to. Kenmore 665.95802 ranges come with a warranty agreement that protects consumers against defective parts. Consult the terms of the warranty; if your range is still covered, it may be eligible for complimentary repair service. Troubleshooting, repairing or replacing any internal components yourself voids the warranty on the range. Contact a professional appliance repair technician to troubleshoot the keytail if you want to keep the range under warranty.