Ulitimate LED Trouble Shooting Guide




This post was written based on many calls we've had from our customers and from customers of other vendors who have a problem with their LED fixture, and needed a solution...



1. Single LED Fixture / Retrofit does not power up

This could be several things. Are you connections to the LED Driver properly done? Any lose wires? Is your LED Driver supply DC voltage to the LED Modules? This is typically one of four things:

  1. Lose wiring.
  2. No power to the driver.
  3. Bad driver that needs to be replaced.
  4. You may have a voltage issue. Under voltage or over voltage may trigger the drivers protection circuit, which causes the light not to turn on.


2. Some LED Modules on the fixture or retrofit do not light up

Some larger fixture have several modules. Sometimes some of the modules light up, others are all dark. This tends to be one of the following

  1. The fixture uses multiple drivers, and there is a lose wire to the driver, or the driver is damaged.
  2. If there is only 1 driver, then check the wire connection between the drivers output and the wires to the led module that is not lighting up


3. One (or a few) of the LED Diodes does not light up

This typically means that the diode is damaged. It may have been touched at installation time or it may be just defective. In any case, if your fixture has many diodes, this will only minimally effect performance. If the fixture has many unlit diodes and it is not an entire module as described above, you may have another issue. Remember

  1. Never touch a bare LED Diode
  2. If your modules are not IP65 or above rated, then make sure they are dry. If you retrofitted a LED Head into a fixture that leaks, that will affect the LEDs and even more importantly, void the warranty.


4. The LEDs are flashing

This is usually 1 of 2 things:

  1. There is a problem with the LED Driver, and the problem manifests itself with flashing.
  2. There is a voltage problem, either over voltage or under voltage, causing the driver to flash as a signal to you that there is a problem


Always make sure you have the proper voltage driver for the voltage in your installation. Using a 277V driver and attaching 480V to it will kill the driver.


5. LEDs come on, then dim, then go to full power, over time. This repeats.

This type of behavior is consistent with over heating problems. LED products have evolved over time, with both LED Modules and Driver incorporating heat protection circuitry. When an over heat situation occurs, the LEDs will dim to cool, and when they are cool enough, they will go to full power.



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