I am using a hoover ultra steam cleaner but the

Thankyou,

The redball indicates that it is full, that is due to the high resistence its suction system is inducing, because it is empty and it still stays up, I would try to turn the power settings a little lower, or it is experiencing high pressure from operation. Also, if you could adjust the bristles, or losen around the air vents. This should do the trick.
Thankyou, :)