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have you checked the chain tension adjustment for proper amount of deflection? This is listed in the manual that comes with your garage door opener. Usually, the chain is too loose from the problem that you are describing. I would check online for the manual if you don't have access to yours. Also, the travel adjustments for stop (up and down resting positions) would be explained as well.
Motor has overheated; the motor unit does not operate or trolleyis stuck on stop bolt = Motor unit hums briefly; RPM Sensor =Short travel 6-8" (15-20 cm).• Unplug unit to reset. Try to operate motor unit, check diagnostic code.• If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace RPMsensor.• If motor unit doesn't operate, motor unit is overheated. Wait 30 minutes andretry. If motor unit still will not operate replace logic board.