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I love these and have 2 of them! The warrantees are usually good and it is your pump if both the hand held and carpet positions won't spray water. Both the soap tank and water resevoir need to have at the very least water in both for the unit to work. Yes... You can use just hot water for light cleaning in both. The pump controls both the spraying water and suction. Last, if one or the other won't spray, the unit can have residue blockage. The passages are narrow, check to see if they are clean. Last test. Turn it on, release the handle. At the base of the neck there will be an oval shaped opening. With the handle on the floor as if filling the unit with water...put either your hand or a paper plate over the hole to see if there is suction. If the pump is good, you will feel a lot of suction against your hand or the flat surface of the plate.
tip unit back to lift brushes off floor and roll forward until over carpet edge. tip back unit to sit flush on carpet and unlock handle so it swings freely. now pull backwards ith finger on spray trigger. that's how it works, not by pushing forwad.
Under the plastic under the water tank (its a pain to pull apart to get to it) there is a solenoid that actuates the water between the floor and the tools. This is toast if its not spraying the floor, its simply not reacting to the signal to let it go through to the water side.
Seems to be a common problem with the Bissell Proheats. You can order a new one online for about $12 and try to get to it to replace it yourself (if you can open up the base its obvious which part it is if you just follow the hoses).