I don't have a Bissel but had a similar problem. The tank that holds the water and soap was not properly locked down. The spray/water was not coming out. I opened and properly shut the tank and it was fine. Good luck.
No ideas from me except to say I hope you have better luck getting yours fixed than I have. I have had several Bissell products in the past few years and now I will never buy another product of theirs ever again. The shampooer I have, I can take it in to the shop recommended by Bissell, pay a small fortune to have it fixed, it'll work maybe twice, and it needs some other thing on it fixed. After the 3rd trip to the repairman, I said no more. I'm going back to Hoover, which has always been a good brand for me.
The bissell has a small pump that is trigger fired. This could be stuck since it is plastic, or if you run detergent through the machine, the alkaline buildup could cause it to stop working. Try wd40 on the trigger to see if that helps or try to get to the pump and see if there is a short or other problem.
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