A strand of lights is out on my tree!

If you find a portion of lights out on your tree, always the first thing to do is to make sure that all extension cords and light strands are plugged in correctly and securely. Look closely inside the tree for any cords that are not plugged into the other lights or central cord. Please reference your instruction manual to see how your tree lights are supposed to be connected.

Sometimes one loose or burned-out bulb can cause a whole segment of lights not to light. Just one faulty bulb can lead to 10 or more bulbs being unlit due to the electrical construction of most artificial Christmas trees. Unfortunately, it's hard to know which bulb is the culprit, as many times faulty bulbs cannot be visually detected. You may need to try replacing the unlit bulbs one by one with a spare bulb (provided with your tree). When you find the bulb in question, all of the unlit bulbs should re-light. Please see the below instructions on searching for a faulty bulb.

Taking a single replacement bulb, remove the first bulb in the strand of unlit lights and replace it with the new bulb, making sure that the metal connections between the bulb and the socket are touching.
If the strand still does not light, put the original bulb back and move on to the next light with the replacement bulb.
Go through each unlit light until you find the light at fault. Mark the ones you have already tried with a marker or a piece of tape.
Once the light in question has been replaced, the rest of the unlit bulbs should light as well.