It's very rare for an LED to go bad.The pedal functions normally but the LED will not illuminate? If the pedal is still under warranty it will be repaired no charge. If it's out of warranty it is usually not an expensive repair.
It can be a tricky repair. We have seen many customers fry the main circuit board trying to repair it themselves.
Here is a link to our technical support page:
TECH 21 - SUPPORT