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What is a pull light string?
A pull light string, also known as a pull chain switch, is the hanging string that you pull to turn lights on and off. It is commonly found on ceiling fans and pendant lights. The pull string is attached to a switch that connects and disconnects the power to the light. When you pull the string, it toggles the switch to either complete or break the circuit, turning the light on or off.
Pull light strings provide an easy and convenient way to control a light fixture, especially when mounted high up on the ceiling. It eliminates the need to climb up and down just to turn the light on and off. The pulling action also allows the switch to be operated even when your hands are full.
Why does a pull light string stop working?
There are several reasons why a pull light string may stop working properly:
Broken string
The most common cause of a non-working pull string is a broken string. Pulling the string back and forth over time can cause it to eventually snap. A broken string will no longer be able to engage the internal switch mechanism to toggle the lights on and off.
Worn out spring
Inside the switch housing, a small spring allows the string to return to the off position after being pulled. This spring can wear out and lose its tension over the lifetime of the switch. A weakened spring may not have enough force to reset the switch, causing the lights to stay on or flicker instead of turning cleanly on and off.
Faulty switch
The switch itself can also malfunction due to normal wear and tear over time. Issues like corroded contacts, jammed moving parts, and broken internal components can lead to a failed switch. If the electrical connection is unable to be properly made, the lights will not turn on when the pull string is tugged.
Bulb failure
Sometimes the issue is not with the pull string at all, but with the light bulb itself burning out. Before assuming the pull string is broken, you should first make sure the bulb is still in working order by replacing it with a new bulb. If a new bulb works, then the old bulb had simply reached the end of its usable life.
Wiring problems
Faults in the electrical wiring connecting the switch and light fixture can also prevent the lights from turning on. Defective wires, loose wire connections, corrosion, or damage to the wiring can disrupt the flow of power. In these cases, the pull string may still seem to work fine, but the circuit is not completed to the light bulb.
How to repair a pull light string
If your pull light string has stopped working, follow these steps to get it functioning again:
Step 1: Replace the light bulb
Before doing anything else, screw in a new light bulb to make sure the bulb is not burnt out. If a new bulb turns on, then the old bulb was the issue. You can stop here!
Step 2: Check for breaks in the string
Examine the pull string for any visible breaks, cuts, or damage. Run the string through your fingers to feel for any rough edges or splicing. If the string is broken, you will need to replace it.
Step 3: Remove the switch housing
Turn off power to the light fixture at the circuit breaker. Take the light fixture down or access the switch housing. There should be screws to remove a cover plate and expose the inner switch mechanics.
Step 4: Check the spring
Look for a coil spring inside the switch housing that runs the string pulley. Check that the spring is intact and tightly wound. If loose or damaged, replace the spring.
Step 5: Clean electrical contacts
Use an electrical contact cleaner spray to clean the metal contact points inside the switch housing. This removes dirt, oxidation, and corrosion buildup.
Step 6: Check/replace the switch
If the spring is functional but the contacts still do not properly connect, the switch mechanism may be broken. Replace the old switch with a new compatible UL-listed replacement switch.
Step 7: Re-string the pull chain
Thread a new pull chain through the hole and attach it properly to the switch pulley mechanism. For pendant lights, also re-thread the string through the decorative chain loop.
Step 8: Secure cover and test
Remount the switch housing cover plate. Turn power back on at the circuit breaker. Give the pull string a tug to verify that the lights now turn on properly.
Tips for reducing pull string repairs
Here are some tips to minimize wear and extend the life of your pull light strings:
– Do not excessively jerk or swing on the pull string, operate gently
– Keep pull strings away from moisture to avoid corrosion
– Periodically clean dirt and dust buildup from strings and switch housing
– Use small wire or plastic springs to stop the pull string from slapping against the light fixture
– Have an electrician periodically inspect the switch and wiring for early replacement before failure
When to call an electrician
While many pull string issues can be DIY repaired, it is best to call a professional electrician if:
– You need to access difficult-to-reach switch housings
– The switch replacement involves complex rewiring
– You lack confidence working with electrical wiring
– Other ceiling or wall repair is also required
– The root cause points to a wiring fault in the light fixture
Electrical issues can be dangerous, so entrust repairs to licensed electricians when needed. They have the proper training, equipment, and experience to safely diagnose and fix your pull light string.
Conclusion
Pull light strings provide a convenient way to control ceiling and pendant lights. But the pulling action can wear down components over time. Typical issues include broken strings, faulty springs, corroded contacts, defective switches, burnt out bulbs, and damaged wiring. With some basic troubleshooting and replacement of worn parts, most pull strings can be quickly repaired and restored to working order. Calling a professional electrician is recommended for complex wiring issues or upgrades. With some care and maintenance, your pull light strings can keep operating smoothly for years to come.