Ex-maven t1_itvozr9 wrote on October 26, 2022 at 5:27 PM

You may be getting a into electronics here. LEDs often require a driver circuit to provide the correct voltage and current. If the system was sized for a certain voltage drop and current draw, and the new LEDs are requiring something else, the power supply may not function properly.

Unfortunately, I am no expert in this so I don't think I can offer much more (my work with LEDs is limited to relatively simple circuits and repair of a couple LED desk lamps...but I was able to educate myself through various internet sources just enough to solve my particular issue).

dad_called_me_beaker t1_itwkuan wrote on October 26, 2022 at 8:49 PM

One other electronics 101 point--LEDs are diodes. That means they only allow electricity to travel through them in one direction, and they work with DC. If the wires from the fan are AC, the fan may not work because half the cycles will get blocked. If they're DC and you put the LED in series, it will only work if the diode is oriented correctly. Try switching which pins connect to which wire.