Here is a copy-paste from the manufacturer..
Why won't my garage door opener light turn on?
There are four causes for the lights on a garage door opener not to come on.
- Light bulb
- Contacts in the light socket
- Light socket
- Logic board
Verify that the light bulb has been replaced.
Contacts in the light socket
If the light bulb has been replaced and the light is still not coming on, follow the steps below to pry out the contacts inside the light socket.
- Unplug the opener. If, there is a back-up battery, disconnect it.
WARNING: Failure to unplug the opener may result in electric shock.
- Take out the light bulb.
- With a small flathead screwdriver, pry the two contacts inside the socket out so that they will make better contact with the bulb.
- Put light bulb back in, if there is a second light, repeat above steps.
- If there is a back-up battery, reconnect.
- Plug the opener back in. Test the lights.
Light Socket or Logic Board
If the light is still not coming on, it could be the light socket or the logic board. To determine which one it is, follow the steps below.
- Unplug the garage door opener, then immediately plug the opener back
into the electrical outlet. Listen for the light relay on the logic
board to click.
- If you hear a click, replace the light socket
- If you do not hear a click, replace the logic board.
Note: This does not apply to garage door openers that use a work light that is separate from the garage door opener.