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Check for a plugged tube in the wall by listening to the motor when it's running. If it sounds like it's running too fast then there's an obstruction. If it sounds ok, then there's a disconnected tube somewhere in the system.
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.
Is this motor thermally protected? Are you running it on 240 VAC and the pump is set up for 240 VAC? (120 VAC- and 120 VAC?). Pump is on its own circuit, or one adequate to supply the proper volts, amps and watts? No extension cords involved?????????
The motor does this because it is over heating for some reason ... improper voltage comes to mind.
You say it starts but will not run ... a faulty run winding comes to mind (start circuit is evidently ok)
Overheating can als be caused by an obstruction in the suction or discharge ...
If the motor turns, you should have suction. Put the hose on the exhaust side of the motor if there is a connection, and try to blow it out. If you can't, try using a garden hose or toilet snake to clear the hose. IF the hose is clear, and the problem continues, check the float in the cage below the motor. It should be down at the bottom of the cage. Also, if you haven't been using a bag or foam cover for the cage, it is possible for leaves to clog the motor.
If by stopped working you mean that it no longer has any suction, then check the hose for a clog and also clean all the filters.
If you mean that it literally stopped running, then the most common cause is a faulty switch. If the machine is still under warranty, contact Shop Vac for a replacement motor, Switches for shop vacs are not available, only replacement motors. If the machine is not under warranty you can either replace the motor or the whole machine.