Most likely cause: the motor has overheated and triggered its internal thermal protection.
Fix:
- Unplug the blender from the wall outlet.
- Let the motor base sit and cool down for 20 to 45 minutes.
- Plug it back in directly to a wall outlet. Do not use an extension cord or adapter.
- Ensure the On/Off switch is in the On (I) position and try starting it again.
If that didn't work:
- Check the circuit. If you have a GFI outlet near a sink, it may have tripped. Reset the wall outlet or circuit breaker. If it keeps tripping, unplug the blender and contact Vitamix Customer Service.
- Confirm the variable speed dial is set to Variable 1. The machine must start on the lowest speed setting.
Heads up: Never supply power through an external timer or switched circuit. This can cause the thermal cut-out to malfunction.