The LED is polar.
1. First thing to try is unplugging the white led and flipping the LED 180 degrees and plugging it back in. Does it light up?
2. You may need to use double-sided tape to stick it back into place.
3. If this does not work, you will need a new white LED.
4. Please contact Technical Support at 781-324-8383 Option 3 or e-mail service@europeanhome.com for further assistance.