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I have no idea just what reverse suction would be or how to get it from ANY vac. If you're looking at getting the blowing air from the vac instead of suction, then simply move the hose from the suction end to the exhaust end.
It could be clogged at the head or throat, or you might have a hole in the hose. Unplug the hose; if you're getting suction where the hose plugs in then the problem is in the hose or the head. If you're not getting suction where the hose plugs in then the problem is in the body, probably the throat. If the problem is in the hose or head, detach the hose from the head and check for suction at the end of the hose. If there's not suction there, then you've got a clog or a hole. If there is suction there, then you've got a clog in then head.
I think you mean it's an 8955, Riccar has not had a 8995 model. If there is no suction in the hose it has to have something clogging it. Open the little round opening on the back of the vacuum where the hose attaches to see if you have suction there.
It automatically switches over when you disconnect the hose from the power nozzle. No suction it getting to the power nozzle, so the suction is only through the attachments. If there is no suction through the hose, check for clogs in the hose and in the tank where the hose plugs in. Also, check the screen at the bottom of the tank. If there is a clog in the hose or tank, then there also will be no suction to the power nozzle.
Remove all clogs and you should get suction.
Disconnect the suction hose. While running, check the suction port if it works, by putting a piece of paper. If the paper is taken in, then it is oK. Now, check the suction Hose for breaks or opening before the suction head. Breaks or opening breaks the suction power at the suction head. Loose connection between the suction pipe and the suction port also must be check as this will also cause the same problem. You may need to replace the suction hose to correct this problem, Send us the e-mail and your vote if this solves your problem.
You say it lost its suction, then you also say this is plenty of suction power, seems you cant figure out the prob. Try cleaning the fan on the suction blower. The blades can get chocked with dust which will give you a reduced suction.