![]() However, a bulb tester – or a tool that includes one of these, such as the LightKeeper Pro – is generally the simplest solution. ‘Frequently, the bulb will appear to be smoky as well.’ ‘You can identify which bulb on your string of traditional Christmas lights is out by looking for the bulb that is burned out or has lost its filament by looking at the tiny small filaments in the light bulbs,’ explains Imani Francies, home decor expert with USInsuranceAgents. You might be able to see which bulb is out on Christmas lights simply by looking. ‘A consumer might also plug too many incandescent sets end to end blowing a fuse in the first set but giving the appearance that all of the following sets also don’t work because they won't illuminate.’ How do you know which bulb is out on Christmas lights? Alternatively, squirrels for some reason love the insulation on light set wires and often chew on them, causing a break in the circuit and a nonfunctional light set. ‘Old LEDs often had corrosion issues due to weather elements building up within the socket and keeping the bulbs from making a proper connection. That doesn’t mean the entire section is bad or needs new bulbs, but it means you’ll need to find that one to get the rest illuminated. If one bulb goes out, the entire section becomes unlit. ‘The more common light sets work in series fashion, meaning each bulb depends on the rest. ‘There are many components that make up a light set and therefore there are many factors that can lead to failure,’ explains John DeCosmo, president of Ulta-Lit Tree Company. (Image credit: Getty) What causes a section of Christmas lights to go out? If the lights still don’t work, you can use the tool’s detector according to the manufacturer’s instructions to locate the problem area, then replace the bulb here. Use the Christmas light repair tool available at Amazon as directed in the instructions. The problem with Christmas lights may be a faulty shunt. Make sure they’re screwed in tightly then plug the lights in again.’ 4. Unplug the lights and check each bulb in the set that isn’t working. ![]() It may be tempting to do this while the lights are plugged in to get quick feedback on what you’re doing, but you could electrocute yourself if you do this. ‘This is easy to fix, but you need to be careful. ‘Usually the culprit is a bulb that's come unseated from contact with the circuit,’ he explains. ![]() ‘Strings of at least 50 lights typically have between two to four circuits, which is why the whole string doesn’t go out. Perhaps the problem is that a whole section of the lights isn’t working? ‘Christmas light strings share a circuit so when one isn’t firmly attached, it throws out the entire circuit which means the others aren’t going to light up either,’ explains Andre Kazimierski, CEO, Improovy. Make sure you follow the rules on Christmas light safety and do so with a bulb with the correct voltage rating. ![]() If that wasn’t the problem, replace the bulb. Simply twist the bulb if it moves then this may have been the issue and you can plug the string in to check if it now works. Wondering how to fix Christmas lights if the problem is that one bulb isn’t working?įirst of all, check the problem isn’t a loose connection.
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