Sounds like it could be the low oil pressure shut down. It could be low on oil or just a bad oil pressure sensor.
The start switch bypasses the low oil pressure function. You can try to hold the switch longer to build some oil pressure. Or you can unhook the sensor. It's best to make sure the unit has oil pressure so it doesn't destroy itself while running with no oil pressure. Basically you need to determine if the problem is electrical or oil pressure related.
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