A pool light is out: what to check first
Check the switch, the timer, and the GFCI before you buy a lamp. Reset a tripped GFCI once. If it trips again, stop and call an electrician. Match voltage, niche, face ring, and cord length, and leave wet-niche wiring alone.
· 5 min read
Turn the breaker off before you handle a pool light. A GFCI that trips again, and any work inside the niche, is an electrician’s job.
Rule out the switch and the GFCI
Many “dead” pool lights are a timer that did not change with daylight saving, a switch left off, or a GFCI that tripped. Reset the GFCI once. If it trips again as soon as the light is switched on, stop. That is a ground fault. Do not keep resetting it and do not open the niche to look.
The breaker for the light should be off before anyone pulls a lamp. Pool water and line voltage share a junction. Bonding and the wet niche are not a homeowner troubleshooting step.
Match the lamp, not just the color
Incandescent and LED pool lights are sealed assemblies sized for a specific niche. The face ring, the cord length, and the voltage are part of the match. A 12-volt lamp on a 120-volt circuit, or the reverse, fails immediately or worse. The voltage is on the old lamp’s label and on the transformer if the system is low voltage.
Write down the brand molded into the face ring or the niche, the wattage or LED model, and the cord length before you order. A universal LED still has to fit the ring and the conduit. If the old cord is too short to reach the junction box on deck, you need the longer cord, not a splice in the conduit.
What else fails around the light
A light that flickers, or works only when the ring is pushed, often has a loose connection at the junction box or a failing transformer on a 12-volt system. Leave the box closed and have an electrician open it. Corrosion in that box is common and it is still live equipment.
After a lamp is replaced by someone qualified to do it, confirm the GFCI protects the circuit and test it with its button. Replacement lamps and transformers are in lighting and electrical. For the numbers on the old part, use how to match a replacement part.
Questions
Why did my pool light stop working?
Often the timer did not change with daylight saving, the switch is off, or the GFCI tripped. Reset the GFCI once. If it trips again as soon as the light is switched on, that is a ground fault. Do not keep resetting it and do not open the niche.
Can I replace a pool light myself?
Turn the breaker off before anyone handles the lamp. Matching the lamp is a parts question: voltage, niche brand, face ring, and cord length. Opening the niche, the junction box, or a transformer is an electrician’s job.
What should I write down before I order a pool light?
The brand molded into the face ring or the niche, the wattage or LED model, the voltage, and the cord length. If the old cord cannot reach the junction box on deck, order the longer cord. Do not splice a cord inside the conduit.