If the rollers or other parts seem stuck, you can try brushing on some kerosene to the parts. If they are rusty, use steel wool to take away the rust and lubricate as usual. If they are badly corroded they may need replacement. You also need to take a look at the opener. If it is operated by a drive screw or a chain, you may need to lubricate these parts as well.
Does it need Some Adjusting? ; Check the sides of the doors for any weather stripping. You may need to adjust the doors as necessary in order to have your unit working properly again. If the door of your garage is wood, make sure that it has weather stripping. If not, apply weather stripping on the bottom. Touch-ups may be necessary at this point, so that your wooden door doesn't get stuck again.
Because of the moisture and the low temperatures, the door may appear to be a bit uncooperative. Believe it or not, it is possible for the door to freeze to the floor. If there is only thin ice connecting the door to the floor, usually it breaks when you open it.
In many cases homeowners think that they need a professional, but with a bit of maintenance they can avoid repairs. There is a lot they can do even without the expensive help of a repairman.
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