Unit shows full bucket whe bucket is empty and shuts off

I beleive the model you have, has a float valve in the top of the water collection bucket. If it's stuck in the 'UP' position, it would cause the Bucket Full Light to glow. Remove the bucket form it's holder and determine if the bucket does have the float valve. If so, jiggle the float valve arm to get it to return to the Down position.

If the unit doesn't have a float valve, installing the bucket "squarely" into it's holder from top to bottom is very important. If the bucket does not make firm contact with the bucket removal safety switch (A trigger switch), it will cause the unit to think the bucket is full. After reinstalling the bucket, be sure that the bottom of the bucket is not tilted down in any way.

Hope this helped you to troubleshoot and solve the problem.