The upper spray arm has detached.
Try this.
The upper spray arm might detach if it isn't properly reassembled after cleaning.
Lift the upper spray nozzle's locking part and turn the nut clockwise to detach it. (Reassemble in the reverse
order.)
Lift the end of the nozzle guide, replace the nozzle, and rotate it to the left until you hear a click.
Assembled upper spray arm
Front view of the assembled spray arm
Top view of the assembled spray arm
Bottom view of the assembled spray arm (with the basket flipped)
This guide was created for all models, so the images or content may be different from your product.