Here are some possible reasons for the FL error

• Faulty water inlet valve - This valve controls the water flow into the washer. If it's malfunctioning, it might not shut off properly, causing excessive water intake.
• Blocked drain hose - A clog in the drain hose can prevent the washer from draining properly, leading to overflow.
• Defective pressure switch - This switch monitors the water level in the washer. If it's faulty, it might send incorrect signals to the washer, causing it to overfill.

Before attempting any fixes, it’s recommended to consult your Kenmore washer's user manual for specific troubleshooting steps related to your model. 

Here are some safety precautions to take:

• Unplug the washer from the power outlet.
• Turn off the water supply to the washer.

If you're not comfortable troubleshooting the washer yourself, it's best to contact a qualified appliance repair technician.