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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.
Once you hear the water run out or you have finished cleaning an area then shut of heater and vacuum. release handle with foot pedal release and lift out bucket and pour out dirty water and rinse area/tank /resevoir etc. You should also clean the small red filter in the resevoir of any debris by popping out and replacing. Also, there is an onboard filter under the clear window (where spinner is located) . unscrew clear top , take out spinner device and pull out small plastic screen and rinse or blowout. Clean also the front clear cover if there is debris, by rinsing off with sprayer or wiping clean. You may also find that you have to take off the clear plastic hood window, by unscrewing two screws on either side of nozzle opening (top ) and rinse out as well. Do not, get water under unit into motor area. Place unit upright and in a warm place.. Do not let freeze if in climate that is known to freeze. Good luck cleaning!!
Reasons for that to happen: a) You have tilted the vac while vacuuming b) Used the Rainbow without separator (basket like thing on the bottom of the motor) c) Overfilled the rainbow tank with water (may have happened when shampooing with AquaMate)
Clean and install back the separator, remove HEPA, Set the Rainbow on empty water pan (with HEPA removed) turn it on for a while so everything will dry. Install new HEPA.
You will have to get a new HEPA filter (you can find them HERE)
Unless the design has changed, there should be a cone shaped filter with slots around the sides of it. It's secured to a brass bolt in the center of the Rainbow above the motor. The filter is used to keep water out of the motor. If it isn't attached it can blow water out of the secondary filter as well as the exhaust port. It can ruin the motor in some cases as well.
It shouldn't be operated without it being secured to the base of the Rainbow.
We used to call it a filter but what it is its a water serperator. It looks likes this:
Did you blew thru the heater with both hoses off of it? If you did and it was clear, could be the pump, it is just working weakly. Is the top cover flush with the base in the back? If it has broken loose and has risen up, then it won't work. Here is a diagram that may help:
Some of the e-series has a corrugated filter in the top section. To get to it, remove the clear plastic panels that are the sides. Most have 3 screws on each side to move, then the top half will come loose. There also is filter on the back, there is a door to remove to get to it.
It sounds like you will need to first clean it very well if you haven't yet and then most likely the problem is the rear hepa filter is ruined due to having sucked up what you did and gotten some on the filter. Each time you turn on the machine hot air is blown through it and can smell very foul. I had gotten mine wet once from the machine tipping over and had to replace it because it started smelling moldy. Very easy job to do and its about 25 bucks and you can find them on ebay or other places. Hope this helps