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If you check the code information in the link below you will see that 5 flashes indicates an issue with the RPM sensor or the motor. The motors are pretty robust and rarely fail, so you most likely have an RPM sensor issue.

The RPM sensor has a small Interrupter Cup that looks like a small crown on the end of the motor shaft. The “crown” edges alternately block and open the area in front of the RPM sensor as the door moves. Without the alternating signals, the opener suspects the door has been somehow stopped from moving and will reverse the door back open to prevent possible damage or injury.

The first basic check to make on the RPM Sensor is that the Interrupter cup is in place and blocking/opening the area in front to the sensor. The cup is item 19 in the Owner's Manual image below.

Next, be sure the sensor, item 17, is clean and clear of any debris or dust that might prevent it seeing changes in the cup. Check the wiring, item 5, from the sensor to the logic board is not damaged and the wiring plug is firmly in place so all the prongs on the board are making good contact inside the plug. It is possible to install the plug off-center so that one of prongs is not even in the plug.

If you are still having issues, and the troubleshooting tips here and in your manual and in the other links below do not help, then you might have a problem with the motor itself or possibly the logic board.