Question about Bissell 7920 ProHeat Pro-Tech Upright Wet/Dry Vacuum

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Shampoo not releasing

When we first start we can smell the shampoo. Then we see the water go thru but shampoo level never drops

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I had this same problem. I fixed it by replacing the manifold (manual style) part number 2036806

Posted on Apr 09, 2012

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Either the gasket is off of the bottle valve and sitting loose in the hole. If it is on, then replace the soap dispenser.

Posted on Sep 18, 2008

  • snydsy33
    snydsy33 Apr 09, 2012

    I had the same problem. I fixed the problem by replacing the manifold (manual) Part number 2036806.

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What is the best way to unclog the tubing from the shampoo container to the water supply. My machine, I thought, was working well! Then I realized I did not see movement in tank of shampoo and the carpet...


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The 7920 is a great little carpet shampooing vacuum. Look up manual information for detailed assembly and starting/breakdown procedures. Make certain that the carpet/floor has been vacuumed previous to cleaning with the shampooer! The small nozzle opening will get clogged with as little as a toothpick or cheerio! Step on the rear release arm pedal and drop the handle down to the floor, Pull up on the resevoir bucket handle and place the handle of the resevoir back down to open the top of the tank and fill the bladder with hot water. Replace bucket top and place bucket back into vacuum. Raise the handle until it clicks into place. Fill on board soap/shampoo dispenser by lifting out of chamber on unit and fill with appropriate Bissell or upright shanpoo cleaner. Replace unit and make certain the top is tight. Plug unit in and turn on both vaccuum switch and preheat water switch and wait approx. 2 minutes to get water hot enough to proceed with cleaning. Start by rollling cleaner onto carpet and engage trigger approx 2-3' pathway away from you and then release trigger and draw vacuum /shamppoooer back over wetted area, repeat without using water again unless heavier traffic area. Do not over wet area draw unit back and forth a few times until water runs clear thru the front clear window. Proceed to make another path along side cleaned area and so on.
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Won't release shampoo


If your floor cleaner doesn't spray, chances are the heater unit is clogged. It is easy to fix if you have a few simple tools and are mechanically inclined.

Steps to fix:

- The heater unit is located inside the body of the machine, behind the power/heater switches. Remove 6 screws and split the case open.
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- Take the box to a work bench, and unscrew the 6 or 7 screws that hold on the lid. Don't lose the red washers that are found on the inside of the box that keep water from leaking out of the screw holes
- You'll see a "maze" where the water runs around to get heated up. Clear this of all debris. The inlet and/or outlet ports may also be clogged. I used an appropriate sized drill bit mounted on an electric screwdriver to carefully "drill" out the clogs. Make sure all the debris has been removed. I used an electric screwdriver because my 18v DeWalt hammer drill would have been overkill :)
- Reassemble to box
- Rewire and plumb the box according to your notes or reference photo.
- Put the machine back together.

Doing this saved me a $85 repair and took 30 minutes. My machine now works perfectly.

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