Normally this means that either your transmitter needs to be reprogrammed or you may have loose wiring. OR the alternative is that one of your sensors could be dirty or misalligned and you might not know it. Check the users manual and your door buttons to see if any wiring is faulty or loose. Most of the time it has to do with sensors. Holding button down is a manual bypass to force the door to go down. Something is telling it to stay up. Check your sensors. They can be easily moved, jarred, or knocked loose by accident.
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