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There can be many reasons but lets try the most common one first.
No elect power supply to the motor - check circuit breaker supplying elect power to the control box and or DC transformer. Check DC power supply for transformer to control box.
If that is ok adjust the up load turn switch - normally there are two adjusters regulating the open and close forces applied by the motor. If set to sensitive the door will open or close partially or even not at all. Quick check is open the door by releasing the manual lock and lifting the door by hand. Lock the manual lock again, press the door close switch/remote and see if it will close. If it closes the up switch is set to sensitive. Adjust by turning not more than a quarter turn before trying opening the door. If not sure to what side it must be turned turn it fully to the left try - if not working fully to the right and try again. It is however necessary to reduce the setting to a point just enough to open the door with any manual/hand assistance but where it should stop moving if light resistance is encountered such as hand pressure against direction of travel.
Check the remote contol batteries.
Check for some obstacle in the way of the door.
Check if the door is not locked.
Lastly check the micro switch settings on the door motor.
If the problem is not solved manufacturer assistance support.
I would check the headlamp door open and close relays first. One or both of them may be bad. It might be a bad headlamp door motor assembly as well. Is there anything blocking the doors from closing all the way? Have you tried closing and opening them manually? You can remove the rubber boot from the door motor knob and turn it by hand.
if you talking about door latch wont let door close.try to reset all door locks.first if you cant get door close.work unlock button with remote or door switch.then hold open door handle while you flat screw driver pull up latch in door latch should stay up so door will close.once get door close.try resetting all door locks by sitting inside vechicle with all doors close.remove key from ignition.open drivers door.wait 24 seconds.turn ignition switch on and back to lock position 3 times.press and release drivers door courtesy light 3 times.ensure doors lock and unlock.if not wait 40 seconds and repeat procedure.if this procedure fails. you have problem in the door latch and lock mechanism inside the door itself.
Make sure the door is properly closed!!! The door opener is electric, and the electrics are turned off unless the door is properly closed, hence with the door closed but not fully "home" you will neither be able to re-open the door nor wash what is in the machine. Just give the door a firm push closed and it should spring to life.
Try this: Loosen the chain enough that you can remove it from the sprocket above the motor. Now run the opener until the sprocket turns in the clockwise direction and stops. Reconnect the chain. This will get everything in sync and you will have to tweak the 'up and down limits' a bit to get it just right.
On the side of the motor unit you will find the 'down limit control'. Using a small screwdriver turn this control in the same direction as the arrow printed on the cover. Some tweaking may be necessary to get it just right.
Your motor may be working too hard anad ripping the reset button on the garage door,
Try increasing the power on the unit ( should be some type of dial.) or the door may be jamming up somewhere, Try disconnecting the opener from the door and see if it goes up easily, the door might need service
Check the latch mechanism on the door. There is a piece of the latch that closes around the clasp on the door frame. sometimes this closes when the door is open and you can't shut the door. Take a screw driver and flip this latch piece open and close the door.