Before calling out a technician, here are some quick-fire checks you can do in your own time: 

1. Visually inspecting your garage door’s components
   This is very easy to do as it only requires your eyes and ears. First, look around your closed door for any signs of damaged components – including the springs, cables, and rollers. Next, open your door and listen out for any suspicious noises. A squeak is merely a sign that one of your components needs a bit of oiling, but any gnashing or rusty sounds are a sign that something is amiss.  
2. Cleaning and inspecting the photo eye sensors
   The photo eye sensors are two rounded glass mechanisms placed on either side of the door. These are meant to trigger your door’s reversing functions when there is something along the door’s path. Check if there is any dirt of debris around this area, and clean it using a streak-free cleaner and some warm water. Be careful not to scratch the glass as you do this. Also ensure the eyes are level – you can do this by measuring them from the ground to check if both sides are lining up accordingly. If you have a spirit level, you should be able to realign these yourself if required. 
3. Testing the door’s reversing mechanisms
   Not just the photo eye sensors, but also the manual reversing system. All doors built from 1993 onwards will have both of these installed – they are legally required to do so. If your door was installed prior to this, we strongly recommend that you discuss some options with your local garage door professional as both systems play important roles in your door’s safety and protection. To test the manual system, turn off your sensors, place a piece of wood or a brick along the door’s path, and try to close the door – it should reverse back up as soon as it touches the object in its way. Your photo eye sensors should trigger the door to reverse as soon as you brush your arm or leg along the door’s path as it is closing. Contact a repairs technician if one or neither of these are activating as expected.
4. Checking if the door is balanced or out of track
   Like we said, there will be visual signs and noise indicators that a door is out of balance. But another way to check this for yourself is to disable your automatic opener and lift it up manually. No need to open it up completely – going about halfway should suffice. If you struggle to open it manually or the door doesn’t stay in position, you are dealing with an out of track door. You should check the door closes too – if you need to force it down or it is sliding downwards in full force, you’ll need to get an expert to rebalance your door for you.  
5. Oiling your door’s hinges, tracks and rollers
   Remember: when it comes to extending the life of a garage door, a little bit of grooming can go a long way. Whether that means patching up paint chips, addressing any issues with rust or water damage or ensuring your components are clean and lubricated. For the tracks and wheels, the first thing to do is to clean out any debris and dust that has accumulated along the way. Just use a broom and brush to do this – water and other chemicals might damage this part of your door. Then you can go on to lubricating your hinges, rollers, and track. A light coating of silicon lubricant, which you can buy from a garage door specialist in your area, is all that’s needed here. If you’ve never done this before, and you don’t feel confident about tackling this task, a technician will gladly do it for you.