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check the suction hose where it bends down to the floor unit,, lots of times dirt,hair and stuff collects there when the filter was plugged up. remove the floor plate ( like you were going to change the belt ) and use a wire coat hanger to run up the suction hose and back out and clean out any debris, also check the entire hose for blockage ( top to bottom ). if this is all clear and you still have little suction - then the problem could be the vacume motor itself and you will need to take the unit into the repair shop and have the motor rebuilt or replaced.
The first thing to do is to disconnect the pipe coming into the unit. If there is suction there than you probably have a break in the line. If there is no suction when you disconnect the pipe coming into the unit than it is most likely the motor gasket. This gasket can sometimes get sucked into the motor causing problems. Remove the lid to the central vacuum, than disconnect the motor, you should be able to tell if maybe the gasket has been off center or if it has been sucked up in the motor.
I also had the same problem as you.
Try suctioning up a full tank of hot tap water into the collection tank to soften/release a possible kink in the tubing inside of the vacuum hose that carries solution out to the spray tip. I did this a couple of times and it worked. This info I found on the Bissell website.
Sounds like yu may have a clog, either in the inlet by the brush roll, or the hose. If the hose comes loose, see if there is suction there. If no suction then it is clogged. If suction, then the inlet maybe clogged.
I work on many types of units. If you electric floor brush runs but you have no suction then there is possibly a problem with the relay board that allows you to turn on the suction from the hose handle. This is a low voltage (24 V) switching loop circuit that will cause the 120 V motor in the unit to run.
Inside the wall valve are two brass pins. NOTE: there are 120V valves installed on some systems known as a Super Valve. A shock hazared exists if you work on that type of valve. That being said. In the round portion of the valve you can use a garage hose that has a 360 deg. chrome ring to test the valve. The ring completes the circuit causing the unit to power up and suction at the end of the hose. If the suction is weak, there is a colg in the pipe. If you hear no airflow, the relay inside the unit did not energize or the motor is bad.
To test: go to the unit and turn the switch on the side to "manual" if the unit turns on the motor should be ok. DO NOT RUN THE UNIT without and open valve. In some brands dammage to your motor will occure.
If the unit did not run, look for a small button near the switch. This is a circuit breaker for the motor. If it is poped out and you hear a "click" when you press it in there is most likely motor problems and someone should be contacted for repair.
If the suction at the port that the hose hooks into has low suction, then most likely you have a problem with the motor. Some of these Rainbow motors sound ok running, but are running at a slower speed, thus reducing the suction and replacing the motor is the solution.
On my vacuum the "vacuum fan" (my name for the part which creats the suction) broke off the motor shaft. The vacuum sounded like it was working, but there was no suction. If you are sure there are no clogs (drop a marble down any hoses you can't see through), then this is the likely cause.