Garage Door Opener Not Working Only Travels 6 Inches Then Reverses Stops

My 1 2 hp garage door opener travels only a short distance then stops. In fact even. There are no obstuctions and this happens even with the trolley disconnected.

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Garage Door Opener Not Working Only Travels 6 Inches Then Reverses Garage Door Opener Troubleshooting Garage Door Opener Garage Doors

Garage Door Opener Not Working Only Travels 6 Inches Then Reverses Garage Door Opener Troubleshooting Garage Door Opener Garage Doors

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