Make sure that the tanks are seated properly. If the tanks are okay, then you likely have a pump failure or a restriction in one of the hoses. Here is a link for a previous answer that has information and images on the pump and plumbing inside the unit:
Where can I get a diagram showing where the hoses connect?
. If you are advanced in technical skills, you may be able to access the plumbing and check the pump. Here is a link for a previous answer that shows how to open up the unit:
How do I change the hose assembly on a Bissell 9200 Pro Heat steam cleaner?
. Be sure that you have the shampooer
when accessing internal components. If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:
Sears Home Services