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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.
You may have a stuck relay or one of your access port switches may be bad. According to the owners manual: "A complete check of all Wall Inlet and Power Unit low voltage control lead connections (external yellow leads). Turn system off by removing fuse or tripping circuit breaker at house fuse box."
Check the filter. If it's dirty, thoroughly rinse it in cool water, then let it thoroughly dry before using. If you don't have an extra filter to use during this time, you should get one.
It could also be a clogged hose or pipe. These would cause the motor to overheat, thus shutting off. Check hose at end for suction. If weak or nonexistent, detach hose and try dropping a penny or dime, or marble, down the hose. If it comes out the end, the hose is probably clear. If this is the case, you need to check other outlets.
You probably have a stuck relay. You
can try tapping with medium force next to where the low voltage wires
are attached to the unit using the handle end of a hammer. Even if this
works it's time to replace the circuit board. Take the unit to a local vacuum repair center for service.
The system is ignited by turning on a hot water faucet causing water to flow through the unit activating the igniter.You could disconnect the gas line at the unit turn the valve on and off real quick and smell for gas.If there is air in the line you may have to let it run or purge the line just long enough to make sure gas and not air is comming out.You might want to have utility company do this if you have any worries .I would make sure it is set up for lpg and not natural gas. And then and this is quite often the problem the gas line feeding the unit should be at least 3/4 inch pipe and fairly close to the main supply and in no instance the last fixture in system unless the pipe sizing is adequate for the amount of gas the unit needs to run.If sizing is the problem sometimes rather than running new pipes your utility company might be able to adjust the pressure comming out of the tank to make up for it. Hope this helps good luck
My guess would be that the motor is done. Impossible to diagnose for sure without seeing it of course. If you were happy with the unit before the trouble, a replacement motor will probably run $250-$300. If you are interested in a new unit, shop around. There are definitely better designed and more powerful units out there, although some of them can cost quite a bit more than $300. Good Luck!!
Disconnect the inlet piping from the unit and check the suction there. Be sure that the utility inlet on the unit is closed. If you have good suction, you have an open/broken pipe somewhere, or possible an inlet valve or vacpan that is not sealing when closed. The easiest way to find it would be to install your tubing back into the inlet of the unit, turn the unit on, and walk around the house listening for air leaks. Good Luck!!