Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Do any of the normal tests fault? See picture link? Seat switch and harness to it are the common items to cause problem. Mower thinks there is no one on the seat.
So it is not a safety switch problem, maybe a hydraulic problem? Are all the deck blades free to turn?
Is the emergency brake lever in run position? Do you have operators manual?
1st PDF link is operators manual,it will need to be downloaded.