Diagnosis
FL means "Full Bucket" sensor is still triggered. Either the bucket isn't seated perfectly, the float sensor is stuck, or the sensor contacts are dirty.
How to Fix It
Unplug the unit. Take the bucket out. Look inside the bucket compartment for a small plastic lever or pin—that's the float switch. Manually press it up and down a dozen times to free it if it's sticky. Wipe the contacts (little metal pieces it touches) with a dry cloth. Re-seat the bucket firmly until you hear a click.
If That Didn't Work
There might be water spilled *under* the bucket compartment, tricking the sensor. Unplug, tip the unit slightly to check for pooled water, and dry everything thoroughly with a towel.
Heads Up
Don't just slap the bucket in. It must be pushed in straight and firmly until the front face is flush with the unit. A 1mm misalignment can cause this error.