Here are two types of garage door issues that a property owner should have repaired as soon as they discover them. Malfunctioning Door Safety Sensors Many modern motorised garage doors come with safety sensors. These devices detect nearby obstacles when a garage door is in motion and will stop the door from moving any farther if they identify an obstacle that's too close to it. If a person notices that their garage door's safety sensors are malfunctioning (for example, if their door continues to open or close, even when there is a person standing under it), they should seek out a garage door repairs expert immediately.