Liftmaster troubleshooting

These motors have a FORCE ADJUSTMENT on them that tell the motor how hard to PUSH or PULL try adjusting the one your have trouble with. For example if the motor is not opening the door try turning the up force a little by moving it from number 3 to 4 or low to normal. Then try it again if this doesn’t work then check to see if the door is balanced!  Then you need to check your SAFETY REVERSE.