B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 200; Flight Crew Total 16383; Flight Crew Type 13000
Distraction; Time Pressure
Aircraft Equipment Problem Less Severe
Flight Crew Rejected Takeoff; Flight Crew Returned To Gate; General Maintenance Action
Aircraft
Taking off we had the Takeoff Configuration warning bell go off at 100 kts. Performed Rejected T/O procedure. Exited Runway and completed the checklist. We were not in the caution range and it said to cool for 25 minutes so we returned to gate to have maintenance determine why the configuration warning came on.  We were properly configured and had done the takeoff configuration test on the Final Items checklist and also the warning didn't come on until 100 kts; not when the thrust levers were applied. Maintenance fixed the problem and we continued to [our destination].
B737 Captain reported experiencing a configuration warning during the takeoff roll. A high speed rejected takeoff was safely accomplished and the aircraft returned to the gate for maintenance action.